HK15158A Digital BB/Coreless Mini Servo 25g / 2.8kg / 0.07s

 twistedge 43 points

I think you should start with 1520μ*S/250Hz (For the GA-250 this is 3 Red lights on Gyro Setup). This will work fine for all basic flying. I get too much tail wag at the default 70Hz (5 Red lights).

 Yeswecan 147 points

Its the rate which the servo receives signal. Higher/quicker response. Analogue up to 100hz,while digital are capable of much higher hence better performance and holding position. Usually the first figure (1520us) is the pulse width or type of frequency its designed for and the next is refresh rate( say 333hz for digital) at which it receives signal to move to or hold that position.Hope that wasn't too confusing,only had 2 beers.

 Rotceh_dnih 16 points

Yes 1520 , thats how its set on my gy520 and it has been fine for well over 50 flights

 2Doggs 186 points

I use mine at 333Hz, also running at 6v. Just keep an eye on the servo temperature, and make sure you have no binding in the linkage.

 kanga 1012 points

This servo is actually only a 60 HZ servo , they work best If you set your gyro to the lowest setting you can , on the Ga-250 that is 70hz.
Higher settings will work for a while but your servo may burnout early.

 Yeswecan 147 points

the low frequencies eg 60 ,70 hz are for analogue servos.This one is a digital,safe on 250, can use 333hz monitor operating load temps.

 kanga 1012 points

Most of the cheaper digital servos still only run at 60/70 hz even though they are digital .

 2Doggs 186 points

57 flights so far, at 333Hz and 6v on my HK 450 Pro FBL. I always let it cool down between flights - it gets up to 110f in 70f ambient. Given a choice, I'd run it at 250Hz, but my CX controller doesn't give me that option.

 Yeswecan 147 points

With CX-3x1000 ,if you're using DS on cyclic ,you're right. The option selection 1 *1520u-250hz is for Analogue servos for cyclic and Digital for tail set to 250hz. Higher equates better performance (quicker response,more precise )

 Rotceh_dnih 16 points

After using these servos on the tail of 3 helis i thinks its safe to say Dont use them on anything more then 70hz ,on 250 or 333 they get to hot and Will fail! so you cant trust them unless there on a low setting but then they dont center well so there's always some wag so you must treat them for what they are,,,cheap . maybe it takes personal experience to believe that going cheap on the tail is never a good idea but it really is true!

 2Doggs 186 points

I'm just not seeing that problem - I measure the temperature with an IR thermometer after every flight, and my 15158A is staying really cool, running at 6v 1520us 333Hz with a CX 3x1000 on my 450 Pro. There are many reasons why a tail servo might overheat - too much gain and binding in the linkage being the most common.

 Yeswecan 147 points

From varying results,seems like a QC issue. With some of the lower priced products,its like a lucky dip.Personally,I use decent servos on swash and tail. Heli is more precise and enjoyable. The reason for crashing is minimized and normally due to ridiculous maneuvers or pilot errors. Been using tgy306h for the last 6 months and very happy with them.

 Rotceh_dnih 16 points

yea i had another play today with the 3 servos i have and here's the results all 3 got hot running at 5.5v 1520us 333Hz all 3 got hot running 5.5b 1520us 250Hz all 3 where cool at 70Hz then i found afew 5408 diodes so put one inline on a servo extension all 3 run great at 1520us 250Hz 4.8v only hovering in front yard with piros just as 5.5v control and havent go to 333Hz yet but i now feel safe coz there not getting hot and they fly great on the 450s , im to scared to fly one on the 500 as its got ds515ms and a gy520 so i got a ds520 on the way for that but for the 450's i have restored my faith in the 15158A for now i think :)

 Yeswecan 147 points

better to fly without limits or doubts with your equipments. Inevitable repairs will cost more eventually. Plus you'll enjoy and improve more when you have faith in the equipment.

 p3tras 240 points

AS far as I know 550 uses a standard size tail servo and it is mini sizi

 LOPEX 82 points

with a reduction or with the servo on the tailboom

 p3tras 240 points

It should be fine on 450 pro tail

 Brheli 158 points

Yes I have I use I recomed, it's the same speed from the red HD one

 2Doggs 186 points

1520 333Hz. You might set it to 250Hz to begin with and check the servo temperature, or even keep it at 250Hz to let it run cool.

 p3tras 240 points

Yes, it is not a bad servo and it fits 450 PRO excellently.

 JESMOND 1 points

tks very much ..i buy it now!! really tks.*^_^*

 JESMOND 1 points

hi all i still useing the this servo mor than 50 flights of 5min each...it is one of the best great servo with a cheap price....use it on TREX PRO 450 TAIL.

 p3tras 240 points

Yes, you can!

 Klapuch 164 points

Yes, I have it in my tail and it is good.

 Brheli 158 points

yes, but it's not one of the bests opitions, but if you are not flying 3D it will do the work

 Klapuch 164 points

I don't think they have replacement

 Luis 6 points

I prove with gears mks9257 replacement and fit perfectly.

 klara 9 points

can be mounted on the airframe and is better but if you put a servo with metal gears

 danikronos 660 points

servo is a good aircraft, I have such a servo and use it a year

 dezzaw 11 points

That's what I bought it for. Fits into that alloy cutout perfectly. So far so good.

 Heartstarter 18 points

Works fine in the tail of the 450 Pro. Would recommed you buy the servo mounting nut kit as the rubber grommets that came with it are not stiff enough.

 2Doggs 186 points

where can you get the mounting nuts? With the grommets, the servo sits too high in the mount.

 BernardoUruguay 259 points

Don´t use it. I bought three and two of them stoped working after 5 min on the same heli. The other is on another heli which isn´t flying that´s why it hasn´t broken probably!

 jerrykl720 1231 points

good news! good news ! to the people that who has this servo ! I find the replacement gear set! I think it is better than the original gear ! here is the gear from www.link

 jerrykl720 1231 points

just search for this PRODUCT ID: (HKS9257-Gear)
it is good for this servo !

 p3tras 240 points

It should work with 250hz, but there are a lot of reports about it burning, so I would use it with 70hz to be on safe side.

 Overfill 143 points

Ok but what is the different?

 p3tras 240 points

HZ means how many pulses a sec gyro sends to the servo. So more hz= better performance, but I am sure you wouldn't notice the difference.

 Helimaniacos 899 points

work with 250

 pr0fab 440 points

Jeż*eli tyle podaje specyfikacja to raczej tak.

 p3tras 240 points

Yes, they can. You can connect them to any radio

 majik01 2683 points

These connect to the ESC not the radio - but yes, like "p3tras" said, you can control these servos with any properly configured radio - not just Futabas.

 p3tras 240 points

Better don't risk and use it in standard mode

 Noisy360 13 points

These servos are actually not the problem. they just don't go too well with the hk401 which seems work better with non coreless servos. For the sake of the overall cost of your helli, spend the extra money on a better gyro. like the programmable mini memms. just hooking these too up mine got hot just sitting still it was buzzing away. I have a align gp750 gyro and instantly the servo was silent even set up as a digital sevo

 Helimaniacos 899 points

i have using it on 450 class...fly more than 10x and crash 3x...no problem with this servo.

 SimsonPL 20 points

*Helicomaniacos What gyro you have? Digital or normal mode?

 Helimaniacos 899 points

i do no

 jerrykl720 1231 points

just search for this PRODUCT ID: (HKS9257-Gear) in hobbyking !
it is good for this servo !I had repalce it to my 15158a servo! and I think this gear set is stronger than the origial one!

 fireball412 414 points

The gear broke during normal flight? Can you give more information.

 makis007 1 points

Unfortunately yes, I opened the servo's case to confirm the problem and one of the first and thinner gears right next to the motor pinion was the stripped one.

 makis007 1 points

I just noticed the following replacement gears: www.link suitable for 9650 & 9257, as they seem very similar to the HK15158A gears I would like to ask if anybody have both servos (9650 & hk15158a) just to check if their gears are exchangeable?

 SimsonPL 20 points

Did you checked servo before flight? Always check all servos and blades before flight!!!

 jerrykl720 1231 points

just search for this PRODUCT ID: (HKS9257-Gear) in hobbyking !
it is good for this servo !I had repalce it to my 15158a servo! and I think this gear set is stronger than the origial one!

 Adam939 12 points

yes you can and this is one of the better choices. I use this servo in 500class with GA-250 gyro - the tail is solid. for cyclics will also be good. I recommend.

 opelrules 3 points

Good for tail servo, but defenately not for ciclic.
Servo does not have enough power.

 Helimaniacos 899 points

this servo is good for tail control. i have using on 450 class. very good servo.

 __ysl 11 points

i use on my hk450 v2, hold the tail very good,and very fast servo

 Overfill 143 points

Are you using it on the boom? v2 havent eny mount for it like Pro have. How many flight have you done whit it?

 __ysl 11 points

yes on the boom , gyro is hk401.about 15 flight

 Helimaniacos 899 points

i have make a test, good servo for tail. hold very fine.

 Damian 86 points

Hi, I use this on the tail of m 450 pro with the Turnigy GA min memos gyro. I have many flights ( and some crashes) and it holds tight. No slop still and I am very happy. No 3D, but inverted, fast piros, rolls and ripping turns. Best cheap servo IMHO.

 StevenC 557 points

I use it on my V2 too. I think it is really good, fast and accurate.

 Overfill 143 points

I have it to now and it work really good.

 Noobie 69 points

It tested fine on 1520us. It just pegged to one side on 760us though.

 Adam939 12 points

This servo is designed only to 1520us. when you connect the servo to 760us You destroy them! Use only 1520us

 FlyBart 123 points

condivido ottimo dovrebbero esserci di più colori!

 mctruk 188 points

They have a few arms in the bag. Included is a 5 arm, 2 arm ,4 arm and a round one.

 stormtronix 23 points

default 720

 dude75 27 points

Hi, how did they work with the HK500GT, I'm looking for an unexpensive setup to practice without beeing afraid to crash...

 o1hoegetter 1614 points

i have not got to fly it yet but they center well and im running them in all four places on the heli and the tail on ds mode and so far it seems to be holding up. i got four 9g servos for a 450 heli that i will start building today and with any luck they will work the same i'll post a review after i fly them.. both here and on the hk 9g servo page.. so i say try they what do you have to lose except a heli and the cost of the servos.no reallygo ahead and try them just keep her low for testing your www.link I DONT ALWAYS CRASH BUT WHEN I DO I PERFER COPTERX'S STAY INVERTED MY FRIENDS..........................................

 stormtronix 23 points

this should be just enough for hovering a 500 class heli - but stay away a few meters from it for safety reasons

 o1hoegetter 1614 points

they work like a champ real good in flight

 o1hoegetter 1614 points

i made one flight then i went to fly it again and the tail servo striped as soon as i pluged in the battery glad i was still on the ground swaped out to a bluebird servo bms-661dmg-hs far better servo came with everything for a std size servo still have the other 3 on cyclic and my fingers x

 Indorock 9 points

I have testing this servo with hk401b gyro on 450. It's rock. Great servo

 o1hoegetter 1614 points

did you use this on ds mode

 stormtronix 23 points

no problems in DS-Mode

 alibaba_1780 22 points

no problem with setting ds, but if the beginner setting exp sensitive in order not to reduce the wild tail heli

 Bebo1982 48 points

I have ordered them for testing on a HK-450GT tail. I will give a review soon.

 StevenC 557 points

So far I used 2 of them as tail servo. The first one stopped working after a hard landing. But it is a very good servo, fast and precise and hold the tail as a good servo should. They do seem to warm a bit at 6V, no problem at 5V.