The Hobby King MEMS GA-250 is a high-performance tail-lock gyro specially optimized and designed for RC 3D helicopters. The GA-250 Gyro is the most competitively priced MEMS 250 class gyro on the RC market today!
Main Technical Characteristics
Sensor: MEMS System control: AVCS (Angular Vector Control System) Dual-Gain Function: Two modes can be selected via the TX, AVCS mode or Rate mode. Digital Servo support: 1520us, 760us and 960us.
Working voltage: DC 3.0 ~9V Working current: 20 mA (@ 5.0v) Working temperature: -5~60C External dimensions: 21 × 21 × 10 mm Weight: 8g (Inc plugs and wire)
Hello, I've got one problem my GA250 tries weird tricks on me.. I setservo 1520/333Hz it means LED blinks one time red then I power off gyro..When I try to set servo type again LED blinks twice!! So when I connect servo it beeps and bzzs.. Does anyone has a same problem ? Thx :)
quick question. just trying to cover everything before farther answer. are you in the correct setting menu? there are 2. one for frequency and delay (initialize this as you power up the gyro and toggling the hh and rate switch) the other is for servo travel and limits (initialize this by holding the rudder stick all the way left or right and toggling the hh and rate switch).
Hi, thank you for your reply! Yes I am in right menu, actually I set this gyro many times before and I dont have problem until now.. I set the servo without servo connecting and I follow blinking red LED but after power off and on again the red LED blinks one time more than before.. I do not understand, maybe I'll buy new gyro..
ok. well out of my 3 ga250 1 started having similar problem not too long ago. I've had all 3 a little less than a year and been working properly except the one recently. it would reset the servo frequency to default (5 red blinks) I've set it back to one red blink many times till I went flybarless. I'm guessing this is problem that occurs to the gyro after awhile since other people have mention the same frequency resetting problems. Sorry I don't have an actual solution but maybe just have to replace :(
both are one and the same thing.. in business its mostle called Head lock gyro.. but some people also call it tail lock gyro.. thats quite obvious that the tail will be locked in one position if the Head is locked... no difference..
Yes all trims are zeroed! As I said, both rate and HH feel exactly the same as if it's stuck on rate mode. I swapped it out for a standard gyro and all was good! I'll try another one on my new _Align _Trex 450, when I build it sometime next week!
I bought 4 of these gyros months ago and have only used/tested 2 of them. I can't seem to be able to get them to work properly! No matter if in rate/heading hold, tail is very mushy. When the tail starts to jitter I back off a little on the sensitivity in HH mode, still mushy! It's definitely not locking the tail in place. I have tried 3 fast digital servos, still no difference. Delay setting is off as well.
Ho trovato la soluzione! Il problema della perdita dei settaggi memorizzati precedentemente é* causato Da un disturbo che entra dal Servo di coda quando l'impianto é* spento. se si muove il servo di coda con l'impianto spento esso genera una piccola tensione che entra all'interno del giroscopio facendolo impazzire. così* ho messo un diodo SKotty nell'alimentazione del serVo di coda. quindi tra il giroscopio E il servo di coda. esso impedisce in questo modo che possano entrare disturbi all'interno del giroscopio ed impedisce ritorni di corrente. ho provato e ho fatto una decina di test. da quando ho messo il diodo non ho avuto più* problemi.
I have 3 of these gyro and one has the exact same problem every now and then the gyro resets to factory settings. I had no problems with the other two. I could not figure out why. I swapped them out with the same results. Sorry I never found a solution. I eventually just replaced it cause I got tired of having to set the servo frequency all the time lol.
have been having the same problem but worse it wont let me in to set the frequency and delay then when it does it drops my setup and sets all the frequency /end points to random settings maybe it should be the bin for this one
The HXT900 is not a good choice for a tail servo. It will work if you just hover or maybe fly around a bit. But you should get a digital servo. There are very cheap digital servos that cost almost nothing and perform very well. Like e.g. the D933MG servo.
Alexandre, Currently I have gyro in channel 4 and gyro gain (red) in channel 5. Please tell me what knob or switch on TH9x radio I can use to toggle between the Gyro HH and Rate modes on channel 5. I tried all three knobs ( dials)??
GA-250 arrived yesterday... took a few tries to crack the init sequence using the 9X transmitter!
On the 9X set the Auxiliary Channel 5 to "GEAR" - that puts the gyro sens function (when plugged into CH5) onto the Gear switch (upper right as mentioned).
To initialize: Turn on 9X, all switches OFF.
Gyro should be mounted in a model(or held flat and steady).
With gyro plugged in (black into CH4 and red into CH5)turn on the RX. Gyro will blink blue as it initializes. Flip the 9X Gear switch On, Off, On, Off, On and the blue light should keep blinking with the switch left On... wait a while to check that it keeps blinking, then turn Off the Gear switch and the red light should come on blinking for servo selection.
For analog servos, the latest GA-250 has a 5 red blinks setting of 1520 / 70Hz - that should work with analog servos (I haven't tested it.. still waiting for the digital servos to arrive in the post).
Hello, you must setup the gyro gain with the channel 5 oh the t9x (gear channel) and not with the gyro sense.
More 50% you will be in headlock mode, under 50% you will be in standard mode.
Finally you can set the gyro gain rapidly with the switch on your turnigy 9x.
The trick is to have the gain lower than 50 on the first position and higher than 50 on the second position of the gear switch. Then toggle the switch to get the gyro into setup mode. If the gains are both on 50, rapid toggle will do nothing.
Yes it will work for airplanes. But you need a spare channel on your transmitter to set the gain of the gyro. Because the gyro gain can only be defined from the transmitter. There is no dial to set the gain directly on the gyro.
Plz help!!! i bought this gyro and its not giving any response (blinking) when i connect it to the reciever when power is On..... but on cnnecting red plug the blue light flashes for 2 sec and than again nothing happens.. plz tell what to do..
i just installed the gyro on my heli and connected it to the Rx... but when i connect esc to battery its not responding.. i mean no flash or anything.. but with red plug in, blue LED blinks for 2 sec and than again nothing... :(
ok you should have 3 leads coming of the gyro. the red plug is your gain and that should go to channel 5. the black goes to channel 4. and your rudder servo get connected to the mape servo plug. just sounds like you don't have your wires connected correctly. try that and see. also before you plug your tail servo you need the choose the correct frequency. this is all explained in the manual. hope this helps
no no.. i plugged the wires to the right channels black to 4 and red one to CH5 (servo unpluggd) but on powering up, its just the blue light fast flashing for about 2 sec.. and then the light goes.. red light is not even coming.. M using a FS CT6B Tx.. it doesnt have a gyro toggle switch... does it matter???
yes it does. the way to program the gyro is by toggling between heading hold and rate mode :( using your tx. Not familiar with this radio but I don't think you can with this radio since you can't adjust the gyro gain through your tx.
Maybe try turning the nob real fast back and forth when you initialize the gyro? I would look at your tx manual and if it says anything below 50% on the nob is rate mode and anything above is heading hold mode. Just a shot in the dark here though as I'm not familiar with the radio. sorry
CAUTION: To set this gyro Assan-250 ... it is essential to connect a servo DIGITAL!
But after adjustments, we can connect to a analog servo, no problem.
Excellent result steering installed on the "karting 1/4". Rapid accelerations perfectly straight!
Hi la mouette.
I'm trying to install this giro on a Losi TLR 22 rc buggy, with a M11 4 channels radio... and I can't adjust the End Point, or Dual Rate.. It works, but I only have like 20% os steering travel.. Any idea of how to enter the setting mode with a car radio? thanks.
For use in karting, I removed the gyro Assan to plug it into a normal radio with a digital servo. Following the instructions Assan, I parametered gyro for maximum travel left / right and in the right direction.
Then I replaced the gyro to the servo with a ordinary karting, and it is perfect.
By cons, my radio with steering wheel does not control runs on the third track ... So the gyro is still setting up! It still works, but at high speed in a straight line ... karting waves ...
I did not find trick to limit the output of this third way ...
Yes, this gyro has both heading hold and rate mode depending on your transmitter you can set (usually channel 5) switch to toggle between hh or rate mode. which you will need to do anyways to set the parameters of this gyro. hope this helps
1 thumbs up!
received after 8 days only ! ASIA - EUROPE
Application: use in HK450 heli
Pros : Price ! Size and Weight Ease of use and setup This is basically plug and play very easy to setup but as anotehr reviewer already said not the best gyro I can only advice it to beginners ! In hard pumping 3d figures it will blow !
Cons : performance in 3d !
Conclusion: Although this gyro is not 5 stars I can only advice any newcommer to the sport to go for it ! this si ten Dollar spend well until u reach the heights of 3d u are more then paud back your 10 $ This gyro is a breeze to setup works very crisp and fast and a newcomer will have a VERY HARD job making this gyro blow out !
Just received my GA-250 today. Put it on my Trex-450, sport flying. Loops, rolls, turns. Awesome little gyro. setup is a piece of cake, almost as easy as GY401 setup, Heli Dragounus Elite, sport flying, will order some more, unbeatable for that price !!
1 comment. Reply..
1 thumbs up!
I've been purchasing these gyros for 6 months now. In July there were software bugs that needed to be worked out. ASSAN has solved every issue I could find and the product is (as of December 2012) a rock solid MEMS gyro with incredible hold and minimal (if any) drift.
If you have older gyros .. from last summer ASSAN will reflash them for free...you just need to ship to them. THAT IS TOP NOTCH CUSTOMER SUPPORT!! I did this to 9 of my gyros and they now are ABSOLUTELY PERFECT. Great product and a great price.
Put on the aileron servo they will give you the ability to fly with greatly improved stability in windy conditions. I have no qualms flying my .40 sized aircraft in winds of 30kmh when this gyro is holding the roll axis stable.
1 comment. Reply..
1 thumbs up!
I've tested the ga-250 with the hd 3688HB as tail servo on hk450gt.
I do sport flight, no 3d.
I felt a really a rock solid tail, with no bounce and no drift at all, that
created instantly a really good feeling with the ely!
It's very easy to setup once you read the manual, or just watching setup video on youtube.
The performance of that gyro with the HD servo are the same as the gp750 ds520 that i use on another hk450gt, i won't buy a gp750 again, i will buy a ga-250 instead, same perfomance and a lower price, this is
Assan has done really a great job.
3 comments. Reply..
1 thumbs up!
OMG.... did I just get a mems gyro for ten dollars, just tried this out on my 450gt ....Awesome, no drift have ordered two more as of now. Five stars HK this price cannot be beaten.