HobbyKing Online R/C Hobby Store : Hobby King 401B AVCS Digital Head Lock Gyro

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7/27/2010
Polako89 (100%)
can i use this with a plane using Lipo 1250mah 3S 10c 11.1v??

cferrell (0%)
Possibly - what are you trying to do?

Polako89 (100%)
maybe my question is stupid, but I'm new with RC planes! i use in my plane a Lipo 1250mah 3S 10c 11.1v, and at specification of gyro "Operating voltage: 4.8V ~6V( common for receiver)", my battery is 11.1v, is there a problem?

zander (100%)
your battery is 11.1v but when it coms out of your ESC it is 4.8v. your Rx works also on 4.8v.

Polako89 (100%)
THANK YOU VERY MUCH!!

7/25/2010
bradley (-33%)
how much does it weigh?

7/24/2010
MARK (50%)
Thinking of putting this on my HK 450pro, what servo should I get? Do I need a servo mount?

Aefer (31%)
I have this gyro on my HK 450GT and it works great with a DS 480 servo. http://www.hobbyking.com/hobbyking/store/uh_viewitem.asp?idproduct=8511 but as for mounting it, i dont know this pro version. hope this helps.

swiftdescent (38%)
I think the DS480 is too small for the 450 pro - I'm able to fit a MKS DS9670A in the servo tray on my 450 pro - check for similar sized servos for a 450 Pro.

Lanell (59%)
I've got it and its great for the price.(HK 450),I used INO-LABS Carbon gear HG-201-HB digital servo and if you bought the HK 450pro then it should have servo mount in the kit. K!

Pygar (16%)
I use Futaba S9257 and it fits perfect in the PRO servotray. Also MKS DS8910 AVCS will fit in tray.

recycle (84%)
It comes with a servo mount... Great gyro for the pro!

7/23/2010
Thomas (67%)
Hi everyone. I set the gyro up correctly and it's been performing pretty well. Sometimes the gyro drifts a bit to one side, then the other, staying in around the same direction. When I put some rudder movement in, the tail will respond, then bounce back a bit. Finally when the head speed decreases as the battery goes down, the tail begins to wag a lot, but only when the RPMs have gone down a bit. I've tried gain settings from 60% to 75%. Any input is appreciated. Thanks!

Lanell (59%)
I would like to inquire on what model heli is this gyro? if the HK 450 then are you sure there is no tail gear slippage V1. hope this helps

Thomas (67%)
The heli is the Blade 400. There are some vibrations due to a slightly bent tail and spindle shaft, if that could be the issue. I'm just waiting for the parts to come in. Thanks for your reply!

7/22/2010
pilotoquique (100%)
He comprado 6 HK401B y uno fallo, 2 se les desprendieron los potenciometros de ajuste y otro no se podia invertir. Realmente pienso en un mal producto.

7/20/2010
daniel (34%)
What does the limit adjustment do?

Rawcus (62%)
you know your not allowed away from youtube...

elliot234 (50%)
the limit adjust limits the travel of the rudder servo so that the servo does not bind on smaller helicopters. Wind this down enough so no binding occurs, or adjust it on the radio

Dustin (100%)
for most applications including 3D you will want the delay set to 0 and idealy the limit should be around 100 if the mechanical setup is done well but if not set it so there is maximum servo travel without binding, also you can not use trim or subtrim with most gyros as it is viewed as a constant stick input and the gyro will try to constantly turn the tail slowly in the direction of trim, the endpoints or atv's in the TX will only affect the rate of turn and not actually change the servo travel

7/16/2010
zvman (34%)
If I don't plug in the second wire(gyro sen) to my receiver does the gyro automatically go into Head holding mode?

Aefer (31%)
No, it just stays in standard rate mode. you need the sensitivity wire for HH mode. My HK 450 flies great with rate mode anyway.

zvman (34%)
Thanks for the info!

Philipp (50%)
I don't think it does. But i just desoldered mine for building a kk-multicopter controll...

Dustin (100%)
for this gyro to really function correctly you must have the remote gain wire plugged in, that is the ONLY way to adjust the gain in either rate or HH mode, there is NO MANUAL GAIN ADJUSTMENT on a 401 type gyro

7/16/2010
ulubilge (67%)
can I use this gyro with my 50 size heli ?

ulubilge (67%)
I am a beginner by the way .

vynner (64%)
yes you can... i'm using it on my trex 600E on trial.. head locks... no problem at all..

recycle (84%)
If you want to take the chance... I've seen it on a 90... but net recommended.

7/15/2010
dror_z (34%)
Hi, i have problem with this gyro. i'm using digital servo savox. . the problem is that the tail go right fast about 90 degree it happend at high speed . befor i use analog hxt900 and it didnt happend

pinguin6218 (50%)
What digital servo do you use? Did you try so set the subtrim to eliminate the creep?

dror_z (34%)
i use savox but it not happen all the time once in a while when i push the throttl up. usually the tail is good so i think that it adjust o.k

recycle (84%)
Is your servo reverses correct?

7/13/2010
David (34%)
I don't see any mention of loose solder connections between the two circuit boards. Isn't this supposed to fix those mysterious, intermittent, and other crazy problems with this gyro?

Cacolino (50%)
Mine has a intermitent problem, it suddently stops and start again in a few seconds. Maybe I was'n lucky. I did try to open for properly soldering, but it was looking ok inside. So I gonna keep it on the shelter...

7/10/2010
Otis450 (-33%)
What is a good servo for this gyro?

xlisx (24%)
a jr or futaba servo would be good , or any 10 sec. or below digital servo would be good too.

Sathaporn (36%)
aling DS520 is mach.

tlrascal (-25%)
There are a variety of good servos both analog and digital. I prefer a digital servo with somewhere around .07 seconds transit time. Speed is an important attribute so look at the servo specs and pick one that is the correct physical size more or less dictated by heli size and has a .07 or faster transit time.

crush (45%)
MG90 is a good choice for the price. and if you want really sweet deal go with MKS 8910. They rocks all the time. Trust me

ay6810 (57%)
D922MG Digital Metal Gear Servo 1.8kg/ 12g/ 0.07sec

Otis450 (-33%)
Thanks guys. I'll keep you posted with what I buy and the results.

pipejaramillo (54%)
You can use 8g digital servos

Shura (19%)
S9253 - it is written in the instructions, but can and other high-speed servo

vynner (64%)
i've tried it with a futaba s9254 n a s9257 and MKS 8910 with a 760us servo adapter it all works fine...

recycle (84%)
For what heli?

Otis450 (-33%)
It's actually for an airplane, I'm experimenting with a little help for hovering. My buddy has one and he's amazing. I'm just messing around with the gyro. If it works then sweet, if not then I'll put it on a heli when I get around to building on someday. I'm going to use the D922MG servo. I have not finished the plane yet. Maybe by next week I'll be flyin.

7/9/2010
chopperpilot (50%)
Hi, I can switch on and off the head lock, but the servo doesnt work, neither about the gyro nor about the transmitter. Supply of 5V is on the servo-plug. Can anyone help?

crush (45%)
Remove servo from the gyro and plug in directly into reciever check if it works. It might be bad servo.

chopperpilot (50%)
I tested several servos. Direktly in the receiver they work.

moshe.zmr (67%)
The Signal and the Minus wires are opposite.
Connect the servo's connector in such a way that the dark brown wire will be connected to the black wire in the gyro.

Have a good time.

chopperpilot (50%)
Ok, I connect the servo correct and it works fine. Thank you very much for help!

Sam (25%)
Check to make sure u have the servo plugged in right. On mine, the servo connector adapter was plunged on backwards so the servo wires didn't match w the gyro wires. The lightest servo wire should be on the same side of the connection as is the white one on the gyro. I just plugged my servo in backwards and it works fine.

7/7/2010
Derick Z (34%)
What orientation do these need to be in to function? Label facing up?

Aefer (31%)
The label can be facing up or down. as long as the base of the gyro is level (perpendicular to main shaft) you will be right.

Derick Z (34%)
Thanks!

cl ment (66%)
That's it. *)

Dennis (59%)
The gyro needs to be placed with the label facing up or down, not sideways. The gyro also needs to be mounted securely while avoiding anything touching the case i.e. cable ties or any wires etc. The best way to test a gyro is to connect it before you fix it in place. Then by turning and watching the tail servo you will be able to see which wayit works.

quadracer111 (23%)
Yes, label facing up and the text the front of the helicopter.

crush (45%)
Label facing upside

strike-down (61%)
Doesnt matter whether the label faces up or down. The effect of it being label down is that the gyro response will be reversed, so just flick the reverse switch and the response will be as if it was face up *)

crush (45%)
But you know what strike-down, if you put the label down, how you will set your delays and limit :P. Always Setup label upside. Thats the recommended position.

Sam (25%)
Or down... Just has to be one or the other.

teflon don (24%)
depends on what you use it for if you use it on the tail rotor you need to place it label up

Shura (19%)
Yes, Label facing up

vynner (64%)
best results may be label facing up..

7/6/2010
hohenheim (60%)
Today suddenly my HK 401B gyro went crazy. I don't know why but it can't hold the tail now. It is constantly turning left whatever I did. I did an inspection on gyro and saw that its board is not fit very well and did some hot glue to fix it. But nothing changed even after that. I got Henge MD922 digital metal gear servo on tail. I looked at the servo while it is working and saw that gyro sends commands to servo without any stick movement and it is pushing the servo to turn left instead of centering. I will inspect it tomorrow again.

tlrascal (-25%)
make sure you have the servo channel centered on your transmitter and that you have no subtrim or revo mix. Either of these will prevent proper operation.

6/28/2010
calee (13%)
Hi Friends:
I have 3 analog servos for swashplate and digital servo for tail. The manual said than switch DS must be ON if use digital servo. I tried with this and the servo had a strange reaction with many movements. What happen if I use it in OFF with this digital servo?

DarkHeli (53%)
Nothing bad can happen. It will run in a lower refresh rate. Your digital servo is not suitable for the 401b DS mode.

scott (67%)
try it with it off and test all the movements before spinning it up.

Wiretap (28%)
The servo will react slower, other than that, nothing really. If you are using a 760uS centred digital servo, this is NOT the gyro for you.

cl ment (66%)
It will works too, but it won't be as fast as with ON mode.

Dennis (59%)
This gyro will work a digital servo in analogue mode but not as well..

Richard (67%)
sonme of the lower spec digital servo's will register as analog on some gyro's, should work just fine

crush (45%)
nothing will happen. Only problem is when you use digital mode on gyro and use analog servo. That way it can burn your analog servo dead.

5/26/2010
sykim (34%)
Hi, i have problem with this gyro. i'm using JR3810 Tx width Corona V2 DSSS (2.4G) 6ch receiver. the problem is that this gyro is not initialized. the LED in the gyro blink periodically. anybody have the same problem?

Pieter (0%)
It probably takes a few seconds for your Rx to start-up. This can cause problems with the gyro. Try to unplug the gyro, connect the power to the Rx and when it's initialized connect the gyro. Good luck!

sykim (34%)
I already tried unpluging and connecting the gyro. however, it still doesn't work. Instead, when i turn off and on transmitter, gyro is initialized. Turning off and on transmitter seems to be dangerous solution because that may cause out of control of my heli.

changys (34%)
Try this, keep your tx and rx about 3 feet or more apart from each other before turning on.

Charles (15%)
Try setting rudder trim to 0 or center and maby adjust you gyro sensitivity on the remote. That is what I had to do.

sykim (34%)
I tried your all recommendations, but it still doesn't work!. I'm going to give up! Maybe my gyro is a bad sample or thre is mismatch problem between the gyro and Tx/Rx set. Anyway, i ordered other used gyro (LTG-2100T) in flea market. Thanks for all the comments.

DaoTpc (10%)
hello friend, you configured the Gyro in the Setup of your radio? You have configured the Avs, if not put a 50% in AVS, if the tail swing gradually reduce the percentage. Also see if the channels correctly connected the gyro on the receiver ... good is a good start .. hug, good luck

DaoTpc (10%)
friend you have GYRO configured in the setup of your radio? connected the plug with the yellow wire on the receiver? can this be! regards

John (20%)
Hi, I bought 2 of these - 1 is perfect and behaves as it should, the other exhibits the same blinking problem you describe. Also, my faulty one made the t/r servo move in a very staggered manner over the stick range (only maybe 3 or 4 resting positions). I sent the dead one back under warranty.

sapmaster (17%)
For me this Gyro works fine, no troubles at all. After correct sencitivy setting on transmitter there is no drift of tail on my 250 copter.

Stony1912 (29%)
probably you have a broken one. I tested 3 of them... one was broken, one had a drift and one was OK... maybe you just got a bad piece :(

yanuel (49%)
Check you have the gyro in lock mode!

sykim (34%)
Hi, yanuel, you mean head lock mode right? I think i tried every thing including changing gyro sensitivity. And finally, I am assured that my gyro is a bad sample. Because with the same circumstance logitech gyro work!!! Thanks.

phil333 (8%)
Hi, I've just got one of these and I'm having the same problem. The gyro light just keeps flashing, when you move the rudder it works fine to the right, but when you move it left it stays in that position. This doesn't happen when the gyro isn't attatched, so I guess the gyro is faulty. I'm just going to buy a different gyro...***mer!

phil333 (8%)
Since my above comment, I have managed to configure the gyro to work quite well. I personally had to connect the yellow lead to ch5, also set the reverse on the gyro. I also had to adjust the delay on the gyro and the gain on the transmitter. I also made myself a turn table to mount my heli on, so I could do all the adjustments with the heli on the bench. If any of you are new to heli's and want to know what i'm talking about when I refer to turn table, then go to you tube and type in gyro config and you'll see a number of examples.

crush (45%)
Plug the servo directly into reciever and check if its responding. If not your tx has a faulty pot for rudder input(Tail Input). I had the similar situation. Also if you give any rudder input during initializatoin. it won't initialize. same with trims. Don't touch any of them until it initialize first.

5/15/2010
volltz (54%)
Hi. I'm planing to buy some for my rc cars. But i have the problem, that i'm only using a 2ch receiver in them and so couldn't use the sensibility wire.
My Futaba GY401 in my heli switches between AVCS and normal mode by this channel, so i would like to know in which mode this gyro works if there is no input at the sensibility ch, because AVCS would be, lets say, less optimal for the use in rc cars i guess.
Thanks

Shea (24%)
as there is no "gain" adjustment the only way to adjust sensitivity is from transmitter, it wont work

AEIOU (52%)
without sens-wire it will be in normal mode like all the gyros do.

Lubis (50%)
No gain-wire connected = AVCS, if I'm not mistaken

Warren (17%)
the only reason to use this in an rc car is to force Drifting

Kostas (56%)
Without the "sensibility" wire plugged in the gyro uses normal correction mode. It does not use the AVCS. You are good to go for cars, make sure you mount the gyro with plenty of cushion. Good luck.

zukoko (10%)
super gyro zu diesen preis

calvorotato (0%)
esta mal precio deja bastante bien la cola

Novelli_E-voo (34%)
For cars, the "normal" mode is better, you dont need to worry about the mode in your ca, since the defaul mode is normal when you dont use the gain connector, at least on the futabas.

e2e4 (43%)
I think it will run in AVCS by default.You need a spare channel to turn headlock on/off.

DarkHeli (53%)
You can try adding a small servo tester to the sense wire. Adjust it as you want it, and hot glue the pot so it does not move from vibrations.

5/1/2010
paul (25%)
gyro setting too hard might be affected. try turn gain to negatif and yea make sure single wire to channel 5 like eiliux describe. dont forget have a look limit setting as well.

francisco jose (77%)
http://www.youtube.com/watch?v=196mCHixmp4

4/29/2010
Leo (20%)
hi all, i've bought this HK-401B gyro.. but the problem is why when i push the rudder stick to the left there is no respond at all?? only work if i push to the right.. thought the servo is broken but still OK when i plug the servo directly to receiver.. and the second problem is why my heli's tail always wagging now?

can somebody help me??

paul (25%)
i have same problem before, did you use digital tail servo or normal servo? setting up will be different if you use digital.

try to reverse, if gain on + position, try to bring to negatif (-)

read manual for that gyro.

Leo (20%)
*paul:i am using normal servo and DS switch has turned off.. and all setting has done refer to the manual.. is it because i'm not using TX which can set the avcs mode?? fyi, i'm using walkera 36 TX..

eiliux (81%)
Plug single wire into channel 5 (gear) channel, and use the gear flip switch to turn on or turn of head lock mode. Set Rudder mixing knob to max negative (AVCS gyros doesn't needs Throttle to Rudder mixing), and Gyro sensitivity knob will adjust your gyro gain.

paul (25%)
gyro setting too hard might be affected. for normal tail servo normally on AVCS mode i think. try turn gain to negatif and yea make sure single wire to channel 5 like eiliux describe. dont forget have a look limit setting as well.

Tony (52%)
set servo at 90,set tails pitch at 90 turn on in rate mode,if tail is at 90 you will have equall slider both ways,lots a material printed on this subject,as for the wagg, this normally meas you have your gain set to high,you are making the servo work its head of and will result in a mechanical failure if not corrected,setting vary upon radio used,chech the maual,

francisco jose (77%)
http://www.youtube.com/watch?v=196mCHixmp4

Helimaniacos (97%)
"i push the rudder stick to the left there is no respond" and "why my heli's tail always wagging" you have using more than necessary "gyro gain" on your TX...if your TX have functions(LCD), decrease signal for "gyro gain"(chanel you have using cable of gyro, cable of gain)

domdom (49%)
did you try the fix? *******sergio.salvi.ca/2009/10/18/mystery-gyro-g401b-modifications/?src=hk
i had the same prob, but now its fine

Tony (52%)
you are probably in HH mode with the gain set to high,you said it wagging , then it must fly albeit wagging,so if it didnt have any authority over the tail it wouldnt fly,so you must be in HH,turn down the gain or reduce end points depending wich channel/which radio you are using

James (13%)
Sounds like you have the Gyro in heading lock mode and set to high. If you are running the gain wire to your RX, you will need to set the gain inside the TX. The gain on the gyro itself will be disabled. On these types of Gyro's usually below 50% is in rate mode and above is in Heading lock. If the servo has been reversed for function the correct direction, this will be reversed. Try lowering the gain one way or another.

Deano (70%)
The wagging can be solved by reducing the sensitivity of the gyro through your transmitter and/or by increasing the servo delay by adjusting the pot (dial) on the gyro. The problem with your servo is probably related to your gyro/radio setup (assuming that there is no binding on the linkages). The second dial on the gyro relates to the range of movement of the servo. Try adjusting that. If that fails, try adjusting your end point adjustment on your transmitter (it should be on full throw).

chiroman21 (7%)
Make sure you are running the gyro in standard mode when testing the limits. In heading hold mode the servo responds more to the gyro than your inputs. If the tail is wagging it usually means your gain is to high, or possibly the gyro is picking up a vibration from the heli.

Kostas (56%)
Hello Customer. What servo are you using? Is it digital hi speed. If it is, do you have the limits set on the gyro, and the switch set to Digital? When you go directly to the receiver, is the servo hooked up to the tail? You need to decrease the sensitivity on the gyro for the tail wag..

zukoko (10%)
Ich benutze diesen gyro ineinem Fox und muss sagen funktioniert gut

DaoTpc (10%)
friend, here we go: 1. Disable AVCS on your radio, leave Normal 2. Your servo has to be adjusted with the arm at 90 (initial), it has to stand a good adjustment, also set the limit on the gyro, do so before enabling AVCS in Radio. 3. See if it was well centered. If you were on your radio can Enable the AVCS 50% 4. see if the servo is analog if it is to change the analog Gyro 5. good theory has to work for the two sides now. ******// how to swing the tail, the tail servo arm should be very long, place the balllink in a setting less in the arm. It comes down to the heli to heli ... 450 I leave about 10mm, the 250 leave the 6mm regards

Hermansjoerd (31%)
to much gain lower it i think you have it on 100 now :) than you gyro takes it alllll over :D

azrc_pilot (33%)
Make a mechanically set-up in tail rudder correctly. Ensure your servo in center position, no binding and the tail blades with a slight to the right pitch to counter act the piro motion... Reduce the sensitivity to stop tail wags...

crush (45%)
wagging is due to gain. lower it on your tx. and check if the tail blade is centered as well as servo arm is 90 degree after gyro initialization. If no fix them your problem will be gone.

4/19/2010
Alberto (34%)
Hola
Alguien a usado este servo en un raptor 30?, que tal funciona.
Saludos

Manoel-SC (39%)
Funciona muito bem, me impressionei que ele tem um bom desempenho mesmo em voos laterais ou de re.

Valter (68%)
Uso em um HK450 e funciona muito bem.
timo este gyro. Igual ao Futaba mesmo.

Tony (52%)
i cannot speke your lingo mate , but i can see RAPTOR 30, no way i would use this equipment on a raptor,its great for the smaller 450 electrics,but a raptor nitro-no way

francisco jose (77%)
http://www.youtube.com/watch?v=196mCHixmp4

DaoTpc (10%)
Eu uso em heli 450...se for voo pairado ate arrisco, mas voo 3d no

paulzzr1200 (29%)
I had to down load the futaba 401 gyro spec sheet. I believe I found the link on the web. The program is the same. locations of switches and LED are different. But works the same. here is the spec sheet

Ixtocaltro (50%)
Te cuento que compr este servo para provarlo en un gasser y solo haciendo la prueba, antes de montarlo, ya funcinaba mal. Si se daa en el aire no solo se cae el gyro, se cae toda la inversin. No lo recomiendo.

4/17/2010
marcopico (-9%)
Hi,
I don't know how to set my gyro to head lock mode. I tried changing gain values to more or less than 50% but it doesn't change, is it because I don't use the transmitter gain setting?

Is anyone in the same case?

Brutis (73%)
A bit more info would help like what Tx u using!
On a Dx7 u have to set the gain past 45% to get head lock mode a good starting point is 67% gain.

marcopico (-9%)
I have an old 4 channels (Esky?) transmitter, I an't set the gain from it.
I think we can make it without the transmitter.

r_g_r (90%)
You can only change the gain from the transmitter! The gyro it self does NOT have a dial where you can change the gain.
You need a separate channel to which you attach the yellow wire of the gyro. Then you need to set a value above 50% on your transmitter for the channel to which you attached the gyro's yellow wire.

Greets!

marcopico (-9%)
But what are the two trimmers for, then?

madbuilder (56%)
Use remote gain instead: Plug in the yellow wire into channel 5. Program your transmitter so that CH5 is controlled by VR-A knob. Then, turn the knob clockwise > 50% until the gyro red light illuminates steadily. Turn the knob anti-clockwise < 50% for rate mode.

r_g_r (90%)
*marc: Didn't you read the manual? I would highly recommend to do so. One of the dial is for the limit the other one is for the delay (both should be clearly labeled that way). Gain can only be adjusted via the transmitter.

*madbuilder: He says he has a 4CH transmitter, so there will be no CH5 nor will there be any additional knob...

eiliux (81%)
Gyro has two pots - ATV (servo travel adjustment) and Delay (servo movement speed commanded by gyro. Gyro sensitivity (Gain) adjusts via transmitter Gyro gain or Gear channel (depends on your transmitter).

marcopico (-9%)
Yes it's a 4ch Tx.

rqr: I did but it just doesn't work. "Gain can only be adjusted via the transmitter." Are you sure? So it means I can't activate Headlock mode

Robertops (17%)
The only way to set gain on this gyro (and switch between rate and headlock mode) is with the trasmitter.
I have a 6ch TX from esky that does not have gain adjustment, but it has a "Gyro Switch" that will activate headlock mode.

So, to make it work you need:
- TX with gyro gain (or even just a switch to turn it on or off)
- Yellow wire connected to RX

I'm almost sure it won't work with a 4ch TX.

rbizetto (92%)
you are connecting the yellow wire in the signal channel 5? If you are connected you may have to flip the channel 5 on the radio.

r_g_r (90%)
Hey Marc, yes i'm sure! You can not change the gain on the gyro directly, it has to be done via a separate channel from the transmitter.
To activate Headlock-Mode you must set the gain to an appropriate value above 50%. So without the ability to change the gain you can not activate Headlock-Mode. Sorry...

marcopico (-9%)
And what about if for example I plug the little yellow wire in the throttle channel of the receiver. If I put the stick to top then it should have 100% gain. I don't think the gyro matters which channel you adjust him with.

r_g_r (90%)
For sure it does not matter which channel you use.
When moving the stick from one end to the other, within a certain range the light on the gyro should be on. This indicates it's in Headlock-Mode.

secretman (15%)
for hh you need to set it with the transmitter

paul (25%)
what transmitter you use?

RedLine_24_12 (53%)
hi, try some higer value .. even in mine i have to set sensibility over 63% .. then it is in head lock

Tony (52%)
it depends upon which channel you have used & which radio you have,if you use the gear channel the go to your end point or atv adjustment mode in your radio(end point-ATV-same thig just diff term)Ypu will see you have 100/150 one way and 100/150-the other way some radios are 100 some are 150% dont let that throw you
when you adust your end point on the switch assignment you yhen will control which way your gyro will work,switch up adjust end point to sat 50% then switch down roll th -50% this mean the gyro will be in HH with switch up and rate switch down, wheather or not at 50 is enough is by trial and error,fly tail not holdind-take 50 to 60 and so on until tail waggs then come back 5points

Jan (34%)
Hy, which value exactly are you changing? You need to "tell" the gain setting to the gyro via wire, so if you don't use the transmitter gain setting you need to now what you're doing (e.g. you have a seperate chip in the model generating a gain setting to your liking). If you didn't connect all the wires it won't work.

francisco jose (77%)
http://www.youtube.com/watch?v=196mCHixmp4

domdom (49%)
yes, you must use the transmitter gain setting. its much easier. have a look at the (unofficial) manual: *******manuals.hobbico****/fut/futm0807-manual.pdf
the manual is futaba, but this gyro is a nearly exact copy. dont forget to do the fix. its important. you'll be frustrated if you dont to this: *******bit.ly/hk401fix

marcopico (-9%)
Thanks everyone! I'll try.

richaevans (8%)
Is the gain wire plugged into the correct channel and the RIGHT WAY ROUND?

marcopico (-9%)
I can't, I only have a four channel Tx!

marcopico (-9%)
I tried to change gain using the throttle channel but when I unplugged the yellow bit, it came back to default value.
So I left it onto the receiver and it works almost fine but only to one side, meaning that to the right, after rotating, the servo stays still if I don't turn the gyro back to where it was, but to the left it works in normal mode.

What can I do?

Alex (53%)
Mark, HK401B gain can be changed only via your TX (transmitter). The plug with single wire has to be plugged in into channel 5, also most commonly used for a gear. Depending on your TX settings you might have to adjust end point travel setting on channel 5, or specifically change Gyro gain.

marcopico (-9%)
So it could explain that only one side is in heading lock mode?

Deano (70%)
Above 50% is heading hold mode, below 50% gain is normal mode. You can tell when heading hold mode is active because the tail will not return to neutral after you finish moving the tail - it will make its own calculation as to what input to use to stop the tail drift.

Shea (24%)
how many channels on transmitter

chiroman21 (7%)
What trasmitter and receiver are you using? We need more info to help you.

marcopico (-9%)
It's an esky four channel Tx.
I know about heading lock, but it seems it is working for only one side.

Kostas (56%)
Hello Marc. Must use the sensing wire to channel 5 and setup your transmiter for idle up.

marcopico (-9%)
Why idle up? Is it the only way to use heading lock?

Novelli_E-voo (34%)
To use AVCS mode you *must* connect the remote gain to the channel 5 of your receiver. if you use futaba, use avcs mode and set the gain by the menu. If other radio, use the remote gain above 50%.

azrc_pilot (33%)
You must use the chnl 5 to set the gyro ON and OFF also for setting the gain. If less than 50%, the gyro will go to Normal mode automatically. Hope this will help...

Horacio (64%)
You HAVE to use the transmitter, as far as I tested it... what you adjust in the gyro is not the gain, it's the delay and the servo travel.

marcopico (-9%)
What's delay exactly?

DarkHeli (53%)
You need to plug the gyro sense wire into either a spare RX channel, or into a small servo tester.

marcopico (-9%)
Yes I know but I'm getting my 6EX repaired.

4/11/2010
Haci (20%)
raptor 30- hk500 - hk450 perfect fly

totpic (50%)
I have one and work perfect

francisco jose (77%)
http://www.youtube.com/watch?v=196mCHixmp4

chiroman21 (7%)
Exactly!!!!! Wish I bought more of them. :-)

Kostas (56%)
Can't tell the difference between Futaba 401 and HK401B!

mouchadino (29%)
whokey...gyro....cheap

DaoTpc (10%)
i'm a fly hk450 and hk500, perfect regards

4/6/2010
Nabil (20%)
Can i use this for stabilizing and drift control of my traxxas rustler?

Deoen (40%)
Can anyone tell me what the weight of this Gyro. On the order page it show 10g shipping weight.

salvix (82%)
13.9g is the weight of this gyro (before doing any mod).

Volkswagen <3 (50%)
Yes, this gyro works just fine as a drift controller in a car!

rems (94%)
the gyro is build for stop the move of your tail in a helicopter ,but in drift ,the gyro stop the move of your car and the stability don't be greates. if my answer help you ,please give me a point thanks

francisco jose (77%)
http://www.youtube.com/watch?v=196mCHixmp4

domdom (49%)
you can, if you know how to set it up. make sure you protect it from vibrations! and do the fix:*******sergio.salvi.ca/2009/10/18/mystery-gyro-g401b-modifications/?src=hk

fury95 (8%)
I think you can because one of my friends is doing that and it does just perfect

mouchadino (29%)
how it works almost the same but don.t set head lock mode....set to proprotional mode

4/2/2010
warbirdpilot (54%)
Im having severe TAIL WAG problems..
..on my HK450. Using a HXT900 as a tail-servo.

No matter what I already tried I didnt have success.

Bigger foam to compensate vibrations.
Adjusting delay up/down.
Changed gain settings (0-100).
Shortened servo-arm (linkage).
Checked tail-blade grips mounting direction.
Read all suggestions on the net...

The wag occurs in HH and also in rate-mode. It is very severe. The servo starts to move all the time as soon as I run the motor. Same behaviour with/without mainblades. The servo gets warm after some time. It cant be good for the servo. I DONT use Digi-mode.

DX6i/40A esc/HS65BB cyclic-servos/TH500 motor

Im dissapointed...

wxhuang0 (19%)
Are u flying hk450 v1? For hk450v1, the belt will slip at the tail shaft and no gyro can hold it

markos51 (14%)
i have a blade 400 and i have the same problem.I ordered a better servo .I will reolace and see.

DiaLFonZo (22%)
HXT900 as a tail-servo in not a so good idea. Try ino-lab
***********hobbycity****/hobbyking/store/uh_viewItem.asp?idProduct=5709&Product_Name=HG_202MG_Metal_Gear_BB_Digital_-_9.7g_/_.16s_/_2.0kg
Will more than likely hold the tail... *)

gracho (71%)
I think that you should get a better servo. HXT900 are not the best for tail. If you have the DS switch on the gyro in on position, you should set it off. Get a digital servo and you`ll have no problems.

Manoel-SC (39%)
the hxt-900 is not good to the tail-servo

madbuilder (56%)
I also have the HXT900 tail servo. When that happens I just reduce gain. Other method: Hook up the yellow gain wire to CH5. Use the VR-B knob on your transmitter, dial CH5 to about 35%. This is a good start.

kenobi36 (80%)
Use fast (0,7s) digital servo for tail.

rbizetto (92%)
Make sure there is slack in the other set of tail?

madbuilder (56%)
HXT900 is not ideal but should work. Another idea: eatatjoes posted a technique to secure the circuit board inside from vibration using hot-glue. Sometimes the board gets loose inside the gyro, causing it to think the heli is moving when it's not.

Valter (68%)
Voce tem que usar um servo de mais velocidade, o HXT900 no serve para a cauda. Use um Turnigy DS480 Digital ou outro servo Digital e de mais velocidade que vai resolver o seu problema.

rustofigus (53%)
I'm not an expert on helis but I do know for sure from my experience is that you need a very fast DIGITAL not analog servo in the tail. You need to change your servo or else you'll never fix the tail wag

Tony (52%)
sounds like the circut board inside might be loose,i have read that the early versions had trouble with that

Valter (68%)
O servo HXT900 nao serve para esta funcao, ponha um servo Digital de alta velocidade, por exemplo um D922 ou um MKS480. Abraco! Valter.

Jan (34%)
Maybe you should try another servo? A friend of mine had a good gyro and some tail wag, and after he changed a mks480 to a align ds420 the tail held way better. Tail hold extremly depends on the tail servo.

francisco jose (77%)
http://www.youtube.com/watch?v=196mCHixmp4

Helimaniacos (97%)
decrease value of gain on YOUR tx.... channel of yellow wire

lalagi (52%)
I think hxt900 is weak for tail servo. Try an futaba 9257

richaevans (8%)
Sound more like radio interference. I have the same setup with chinese weight mod and it holds well. Agressive pitch results in around 20deg of yaw but I can live with it for the price. Tail setup seems to be important. Eliminate all the slop from the tail that you can and use one of the outer holes in the servo horn. I found that the older ball links had major slop but the newer ones are fine so check that too.

experienced (10%)
use double side tape metal board double side tape gyro and also you can add some foam in case of gyro.

jmaja (20%)
sometimes the wagging is cause by the wrong rotation of the tail blade.

Deano (70%)
Don't be disappointed in the gyro, once you get it setup it will work a treat. Try getting a different servo, the HXT900 is probably not the best choice. Look for the fastest servo you can find (torque is not as important for the tail servo). Start off with small amounts of gyro gain (like 40% in normal mode or 60% in HH). My HK401 kept my HK450 heli stable with around 56% in HH mode. Also check your tail setup (are the blades going in the right direction, is the belt twisted etc).

Shea (24%)
well hxt900 is not ideal it will hold kinda.. when i had similar problem it was the gear on the tail belt drive it was slipping on its shaft causing really bad wagging and eventually uncontrollable spinning, the tail drive gear that connects to the drive belt is notorious for failure

chiroman21 (7%)
Sounds like you may have received a faulty gyro. You have tried everything i would suggest and without seeing it in person it is tough to figure out. Does your heli have much vibration?

ahilleas (10%)
I would say look again carefully turning the switch to digital form if it clicks you can see right.maby be buttoned, but not is.an Nevertheless the problem continues changed servo and testing digital

dmarnaud2 (29%)
Did you disassemble the gyro and put hotglue between the board and case? See the comments on the product page for a link to the fix. If that doesn't help, try isolation the gyro from the helli and get it as far from the motor as possible and see if the behavior continues. If it stops it could be rf noise fromthe motor.

Kostas (56%)
Warbirdpilot. Please consider going to a digital servo for the tail rotor. Increase delay and decrease the gain. My recommendation is to use the Turnigy DS480 servo on the tail.

James (0%)
It's not the gyro, it's your heli.

DaoTpc (10%)
Friend, do not be disappointed Get one of align ds620 servo for the tail (I use this one) and test ... I believe that is your servant, I would never use this servo on the tail. use a digital servo for own tail ... like ino-lab which is excellent. regards

Valter (68%)
TROCA O SERVO. O HXT900 NAO E UM SEVO PARA A CAUDA. USE UM D922MG OU DS480. SERVO DIGITAL E DE ALTA VELOCIDADE VAI RESOLVER SEU PROBLEMA.

travling (-56%)
u need to secure the inside electronics. just go to rcdiscuss and search for 401b and it will walk you through it.

The1ncred1ble (38%)
Hello guy, As you, i've bought 401B and i've passed several day to get lock my HK450 tail. I've already tried with : Turnigy 1800A Servo 8g/1.7kg/.10sec and Esky 9g digital micro servo The behaviour is the same for both I did following setup: ds -> off (analog) range -> 0 delay -> 50 gain -> 60 This gives you a correct tail holding, with a little jag. I'just ordered a digital servo wich seems to fix the tail lock issue (according to others HK401 users): Turnigy DS480 Digital Servo 1.85kg / .068sec / 10.9g(http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idproduct=8511) Then i recommend you to do the same; order one DS480 and this must be ok :) Hopping this can help you !

racer75 (-80%)
hi, i had the same problem with my hxt900 Servo.....change the servo to an digital ds480 is a very good choice and you`ll be happy!!! On the swashplate the hxt900 work very good!

Sean (17%)
check tx gain setting. set it to about 40%. and give it a try

helibrit (20%)
I know you said you tried every thing but did you take apart and glue mainboard to gyro case and put small piece of foam inside to eliminate vibration mine did the same thing untill I did this and then it cleared up after.vibration is a killer for gyros try to eliminate all you can.LOL Helibrit

Jotaluz (50%)
The HXT900 Don't have Speed try this on :-) http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=8511

3/31/2010
eclipce (80%)
Will this gyro work for a airplane. I want to connect my elevator servo to a gyro.
Thanks

MacGyver (52%)
I am testing it on a shockflyer. Didnt fly yet but it seem to correct the movements well (rudder, elevator, ailerons - 1 gyro for each channel). So, for whom have asked: IT WORKS ON A PLANE!
Look for "plane" there are other interesting topics here that could help you =)

Thanks!

eiliux (81%)
Yes it can by used in rate mode.

kenobi36 (80%)
It should work.

RedLine_24_12 (53%)
you just have to set it properly (gain - sensibility) .. but it will work fine!

rems (94%)
yes it is ,and it is a good idea because your airplane win more stability .

Valter (68%)
- Funciona sim e muito bem.

francisco jose (77%)
http://www.youtube.com/watch?v=196mCHixmp4

Alex (53%)
Eclipce, This gyro will work on the airplane. However you will have to plug in a plug with a single wire into Channel 5, which is also commonly used for gear. You also will have to set it up in rate mode not heading hold mode. Use your TX to set gain and used Limit pot on the Gyro to adjust servo travel.

fury95 (8%)
I now many people who do that and so I think you can, too.

JonesRC (45%)
This gyro is not for elevator. It is head locking and works best on that function. TG-380 is better for elevator, but be careful there is many problems also with gyros and it don't make you any better flyer. Opposite actually as then partly gyro flies your plane not you. Also in trainer level well designed plane with good flying characteristics gyro will make it only harder to fly.

elmacko (67%)
It will work. I have 3 of these controlling the entire airplane!

chiroman21 (7%)
Yes it would, just need to make sure you mount it in the correct orientation.

Kostas (56%)
Yes it will, make sure you have it installed the correct way...

azrc_pilot (33%)
It will work but you have to mount it sideways with start with a low gain at first.

3/25/2010
david (20%)
I have a little problem with the HK401B gyro., at high speed rotation, the tail won't stay stable.. it go left and right really fast. What do I need, or how do I setup the Gyro so it won't do that.. I did what the manual told me...anyone help me?

r_g_r (90%)
A wagging tail usually means your gain is set too high. Try to reduce your gain until the wagging stops but the gyro is still holding the tail.

Or maybe your gyro is picking up vibrations. You should always mount the gyro with sticky foam tape in order to isolate the gyro from the vibrations of the frame.

helimangler (87%)
r g r is 100% correct. correct gain and eliminate vibration. It is a great gyro for the price!!!!

madbuilder (56%)
Reduce the gain to get rid of "tail wag". I suggest you use remote gain on CH5 knob if your transmitter supports it.

speed freek (71%)
Is there any vibration on your helli, if so find the vibration problim and the tail shuld stop waging or set delay on Tx or Gyro.

kenobi36 (80%)
Lower the gain. It's should be different in normal flight mode and idle UP mode when the head speed is higher.

rbizetto (92%)
Hello, read this text will help you too, is Portuguese, but if you use a translator to understand and very enlightening ***********e-voo****/forum/viewtopic.php?t=32259

paul (25%)
try change reverse setting on gyro, i had same problem before. and make sure limit of controling arm enough moving. i did like that and now no drifting anymore.

RedLine_24_12 (53%)
change from head lock mode to normal mode .. this should help

Tony (52%)
turn down your gain or shorten servo linkage

Greature (10%)
your GAIN setting is too much, try lowering it and it should help. I think you can do it in your transmitters model settings. if that doesn't help, you might wana try this: When you take your heli out, wait a little time to let the gyro set to the outside temperature. the the temp changes inside gyro shouldnt mess your gyro setup. Hope it helps!

francisco jose (77%)
http://www.youtube.com/watch?v=196mCHixmp4

Helimaniacos (97%)
you need to a digital TX for solve this problem... in rudder, decrease rate(same to dual-rate, but for rudder)

Deano (70%)
Try adjusting your gain to about 55%-60% on your transmitter. If the wag continues, progressively increase the amount of delay on the gyro until the problem stops.

DaoTpc (10%)
friend, example for futaba 1. As you already beginning to build, configure your radio as the AVCS GYRO 50% 2. If digital is your servo, put the delay at 0% 3. see if you put a 10mm balllink in your servo(rudder), second arm hole. 3. if you keep swinging, reduce the percentage to a maximum of about 20%. below that the other problem .. and I will not be able to help you ok. regards

azrc_pilot (33%)
Reduce the sensitivity. If this wont help, see other discussions on how to rectify the internal vibration.

3/24/2010
shadbolt (20%)
How do you orientate this gyro? I have several other gyros and they all have an orientation line on them, i.e. orientate for yaw, pitch and roll.

r_g_r (90%)
Looking at the manual it states:
Make sure the bottom of the gyro is perpendicular to the main shaft of the helicopter.

So fixing if on top of your boom block with the sticker facing upward would be correct.

Greets!

This customer was awarded a credit for their answer.

shadbolt (20%)
Thanks for that, mine arrived with no manual, only just found the on line one.

r_g_r (90%)
For a lot of HK products you can find the manual by clicking on the purple FILES tab next to the Discussion-tab.
Greets!

rbizetto (92%)
Hello, read this text will help you too, is Portuguese, but if you use a translator to understand and very enlightening ***********e-voo****/forum/viewtopic.php?t=32259

RedLine_24_12 (53%)
immagine an axis that goes from the upper label straight down and exits on the opposite side of the labeled-side .. this is the axis it will stabilize .. you can rotate it on this axis as you need because this will not change the function of the gyro..

francisco jose (77%)
http://www.youtube.com/watch?v=196mCHixmp4

Deano (70%)
Just make sure it is level with the sticker pointing up.

Soren (17%)
When all else fails: Read the manual. ....or in this case, read the packaging. It will give you a clear indication of the orientation. Worked for me.

azrc_pilot (33%)
As long as the main blades rotate to Right Hand direction(clockwise), mount the gyro upright position with DR switch to Normal.

Horacio (64%)
This gyro is sensitive to rotation about an axis perpendicular to the face that has the sticker (i.e., the "vertical axis")

3/23/2010
skyraider (15%)
Please disregard me earlier post. After looking a lot more, it is the servo that is buzzing. It is a DS821 as supplied with the DX7 kit. I followed the HK401B instructiona and set the DS switch to "ON", and set Control Delay Trimmer and Limit Trimmer to "0". I also tried it on 4 different servos (all DS821). The buzz is quite a high frequency and you cannot detect any servo movement.

As I said in my first post the gyro is working well as described, but it cannot be good for the servos to be buzzing all the time. DO I HAVE A BAD GYRO?? Thanks for reading this.

Olin (76%)
digital servos are always tring to center so they constantly make noise. plug your servo into the reciever and see if it makes the same noise. The gyro gain should be set above 50 or it will not come to life. My gain is around 66. Ive had a bad 401b gyro too so if your still having problems buy another. I love the gyro. Good luck!

Pablo (20%)
No Skyraider, yor gyro is OK. Got two of them, both perform in an excellent way, and does exactly what you describe with digital servos. The response, altough, is pretty amazing. Not to mention the price!!!

fairnot (15%)
You should not run it in the digital mode!
I never have and have no problems at all!!
Try it it should work just fine.

francisco jose (77%)
http://www.youtube.com/watch?v=196mCHixmp4

dmarnaud2 (29%)
My 401b is behaving the same. I checked it on three servos and the least buzzy was a analog hxt500servo. I plugged in my Futaba 401gy and it does not have the constant buzzing.

azrc_pilot (33%)
Quote ... "set Control Delay Trimmer and Limit Trimmer to "0"."..... Set Delay to "0" for digital servo but NOT the LIMIT to "0" LIMIT should be adjusted to prevent over travel and binding. Put to 100 or less first then slowly increase or decrease to prevent the linkage from binding. I seems to me that your servo is binding....

3/23/2010
skyraider (15%)
Hi, Just hooked up my new gyro to the rudder channel in normal or rate mode. It works just as i would expect, but it continually is making a chattering noise, but the servo is stationary i.e. not chattering. The only time it stops chattering is when it reaches either limit. Is this normal, or should it be quiet. The link to the quick fix doesn't seem to be working - does that link give a solution to my problem?? Thanks in advance.

francisco jose (77%)
http://www.youtube.com/watch?v=196mCHixmp4

river9988 (59%)
skyraider, I am having the same probelm as yours.
I am using s9257 digital servo and it only buzz when I set the gain on my Tx more than 10%.When the gains are at 0% no buzzing at all.
All this done with the servo placed on the table so no restriction or binding what so ever.
However the servo horns does not moves during the constant buzzing.
I am looking for a solution also.

3/10/2010
Martin (20%)
I have an E-Sky Honey Bee King II. I am still using the E-Sky TX and RX. Will this Gyro work? I cannot get it to function satisfactory to any degree!! My model is unflyable!

helimangler (87%)
Martin.... The answer is yes. It will tame the tail. Be sure to set it up correctly. I have one on mine. It is much easier to handle.

Martin (20%)
Can you please tell me where to plug in the extra lead, and how to set the tx? Any information appreaciated! Thanks.

r_g_r (90%)
The gyro gain channel depends on your transmitter. On the receiver side it's often called CH5, Gear or AUX. Read your transmitter's manual. You should be able to find the info there.

Setting up the gyro can be a very complicated task. Watch these videos, they should help you:
www dot helifreak dot com/showthread.php?t=41692

Tony (52%)
good luck with that, to ajust the gyro you will need a radio that is adjustable,the radio that come with HBK is non adjustable

azrc_pilot (33%)
Unflyable!!! E sky TX doesn't have chnl 5 for rudder sensitivity. You can use a reliable TX n RX like Futaba/Spektrum or Hobby King 2.4Ghz radio. If you were tight in $$$... Go for HK 2.4Ghz 7 chnl Radio... It will work fine...

3/8/2010
markos51 (14%)
i would like to ask something.
I have this 401 hobbyking gyro on my hk500gt and works fine.
I ordered one for my blade 400.Everything is stock and ar6100 for receiver.When i plug the battery thi red ligth blinking the servo centers but the red ligth is off.
The heli flyies ok and it is in head lock but the ligth is off all the time.

r_g_r (90%)
Hi!
Are you sure that you are in head-lock mode?
According to the manual (and my experience with this thing) the gyro is in "rate mode" when the light is off. Which might be just fine!

To get it into Head-Lock mode you need to set the value for the gain-channel to the upper 50% on your transmitter. So if your transmitter supports values from -100 to +100 you need to configure something between 1 and 100 for head-lock mode whereas -100 to -1 would be the gain for rate mode.

Depending on your transmitter you might have a different range for value of the gain channel.

Greets!

fairnot (15%)
Are you below 50%?
I use a Dx7 and if you go below that make the light will go out!

francisco jose (77%)
http://www.youtube.com/watch?v=196mCHixmp4

3/2/2010
Benedikt (20%)
Id like to use this Gyro without a dedicated channel for sensitivity.
Can I adjust mode and sensitivity with connecting the related wire?

If not, is there another product I could use?

Cheers

mirceacul (69%)
You cannot adjust gain without a separate channel dedicated on receiver for gain. I tried using it with ESKY remote. There is no possibility to change gain on tx. It's hard-coded in the factory and on headlock position of the switch, the gain was to big. I tried to take out the gain wire from the receiver and to make it work with the two pots. It didn't work. One is limit and the other one is delay...there is no gain on the Gyro.

Pablo (20%)
You would control the gain of the gyro, but you wont be able to switch the operating mode locally... I dont know which gyro will allow what you ask.

francisco jose (77%)
http://www.youtube.com/watch?v=196mCHixmp4

azrc_pilot (33%)
If you are using a 6 chnl radio, so no problem. Use chnl 5 for sensitivity... No way to unused the yellow sensitivity wire. It wont work.

2/25/2010
koby gaon (44%)
how can i switch it to normal mode?

GavinW (43%)
Set the gain to between 0 and 49% when using the spektrum or JR transmitter for normal rate mode. Try a enter a negative gain value on a Futaba (not sure).

palex (58%)
indeed Futaba asks positive and negative gain values on chanel 5 for switching between the modes. When status LED of the gyro is off then operate in normal mode. If the LED is on then is AVCS mode (it might be still on, or flashing depends the case ... ).

joker30 (69%)
To swithc between NORM and REV you must use the switch on the gyro itself. But to switch between headinghold mode and rate mode you must use your radio. It varies for different companies, but for spektrum radios set the gyro gain above 50% on position 0 and below 50 for position 1, then use the gyro 0/1 switch on the radio to switch between the two.

eiliux (81%)
Just set your Gain channel below 50% (Rate mode). Everything over 50% will be HeadLock (thats also depends on your transmitter, take a look in a manual).

Valter (68%)
s ler o manual.

Agonzalez (45%)
you must do it trough your tx, adjusting gain bleow 50%

francisco jose (77%)
yes. but
http://www.youtube.com/watch?v=196mCHixmp4

azrc_pilot (33%)
Look for DS micro switch on the gyro.... Put it to OFF...

Horacio (64%)
Connect the one-wire connector to a spare channel on the receiver. That channel will switch modes when it passes 50%.

2/23/2010
palex (58%)
As everybody said, a good performing gyro (in normal mode) for only few bucks.

However, I'm having trouble to make it work in AVCS mode.
Can you confirm that is working in AVCS mode?

Any hint how to set it for AVCS mode will be appreciated. The HK401B manual does not give many info and Futaba one seems not to be applicable in this respect.

GavinW (43%)
Hi, I have had good success with it in AVCS mode. I did this. Plug the extra wire into the gear slot on my dx6i receiver. Used a gyro rate setting of 66% (>50% sends a signal for AVCS mode, checked that the gyro light stayed solid). Check your transmitter manual for settings and how to connect gyro.

This customer was awarded a credit for their answer.

palex (58%)
Hi Gavin,

thanks for reply. Could you tell the difference behaviour between normal and AVCS more.
In my case, in normal mode I have still tail with some minor deviations when I do fast up throttling.
In AVCS mode there is a strange behaviour, when hovering, the tail is making sudden pirouette of 40-60 degree and then stay still for a while and then again short turning and so on. Maybe this is normal and I do not understand the concept ... still strange.

GavinW (43%)
Hi Palex,
In normal mode the tail stays fixed but can still weather vane i.e. be blown siedways by the wind (good for scale flying). In normal mode you need to add revo mix to keep the tail steady as you increase the throttle.
In AVCS mode with this gyro my tail is solid, even when I punch the throttle. REVO must be off in this mode. Also check for vibrations and try the 2 minute fix (open and glue the Gyro's circuit bord in place), see salvix's post on the two minue fix under reviews.

Simon (20%)
*palex
I had the same problems with a few other gyros.
My problem was NOT the gyro but the belt driven tail.
Electrostatic charging of the tail boom and sudden discharge caused a servo move (disturbed the gyro) so the tail went 50deg to the side (in my case)
To fix the problem i fixed a wire from the tailboom to the alu motormount(ground for the boom).

wbr simon

Jan (34%)
Use the channel in your transmitter (usually channel 5).

francisco jose (77%)
http://www.youtube.com/watch?v=196mCHixmp4

azrc_pilot (33%)
If you are using digital servo (not 760us) it must be working fine with AVCS. Try use Futaba GY401 manual.... What heli size do you used? My flying buddy used it in Trex 600E without problem at all. Tail locks rock slid!!!

Horacio (64%)
To set the gyro to HH you need to connect it to a spare channel on your receiver. Upon passing 50% of the range on that channel, the gyro will switch modes. I tested all four I got in both modes and they worked fine (better test on ground first!)

2/22/2010
kctrading (42%)
Get rid of a lot of problems with many Gyro's just by adding this extra thick 4mm super sticky double sided foam tape here at HK: http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=8999

francisco jose (77%)
http://www.youtube.com/watch?v=196mCHixmp4

2/13/2010
AndyKay (50%)
The link to the manual above doesnt work, so here is another link which does work:
http://www.hobbyking.com/hobbycity/store/uploads/HK401B_manual.pdf

kakofonixx (59%)
thank you! very useful!

francisco jose (77%)
http://www.youtube.com/watch?v=196mCHixmp4

2/12/2010
Avelino (28%)
Hi. this is my experiense.
I have 2 of this gyro`s.
One broak after 3 flights, the tail start slinding, and the other one allready pass 5 fligths, and so far so good. when the heli is in the hover the gyro holds the tail very well and the behavior is similiar to futaba 401, but when we make the first piroette (180) the tail holds more or less, after the 3th piroette the tail starts doing drift that incrises every piro.I`ll try to put foam inside like a man sayd and see what happens.
For this price we cannot expect more.
Good luck to you all.

francisco jose (77%)
http://www.youtube.com/watch?v=196mCHixmp4

2/12/2010
salvix (82%)
Important 2-minute FIX for this gyro: *******bit.ly/hk401fix ("bit.ly" slash "hk401fix")

bare (90%)
WHAT? is this "fix" also the link goes nowhere

salvix (82%)
Type "bit.ly/hk401fix" on your browser, that's the URL. It's a fix to secure (hot glue) the circuit board inside the gyro case, otherwise it's loose and vibrates when flying (causing the gyro to go nuts).

francisco jose (77%)
***********rcmaster.es/modules.php?name=News&file=article&sid=118

2/10/2010
Avelino (28%)
Hi.
This gyro works the same way as futaba 401.
Just need to find the pdf in goggle, very izi.

VasilakisM (67%)
The manuals is in "files" tab (to the opposite side of the "discussion" tab).

francisco jose (77%)
http://www.youtube.com/watch?v=196mCHixmp4

azrc_pilot (33%)
Agreed...

2/8/2010
SPITFACED (60%)
I Received mine today, i just tried to download the MANUAL but the Link is dead, does anyone know where i can get the Manual from????? Thankyou

palex (58%)
I need it too.
HC please fix the problem.

...

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AEIOU (52%)
in combination Turnigy 2836 Brushless 450-Size Heli Motor 3700kv AND hk 401B gyro there might be problems in the initialization-process and/or when the motor starts turning ( no matter how you do the settings in your TX). i think the gyro looses its zero-point when the motor start but do not have any idea why..... so i changed to E500 motor and now everything is fine

gracho (71%)
Google for Futaba 401 Gyro. They are the same :)

francisco jose (77%)
http://www.youtube.com/watch?v=196mCHixmp4

Majksner (9%)
http://www.hobbyking.com/hobbycity/store/uploads/HK401B_manual.pdf

Novelli_E-voo (34%)
http://www.hobbyking.com/hobbyking/store/uploads/833647683X179727X8.pdf

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