HKSCM9-6 Singlechip Digital Micro Servo (6V) 10g / 1.6kg / 0.07s

 LasseK 558 points

This is a 1520us servo. It works at least up to 333Hz (which is what the ZYX-S FBL gyro outputs for the tail servo). I use it on the tail of my HK250GT FBL and it has worked for hours, so no problem there. I used to have it on the swash as well (which operates at 83Hz with the ZYX-S), worked fine as such but they strip very easily when you crash. I have had a few "close encounters with mother earth", but so far it has not stripped (while acting as tail servo), so really happy with it, especially considering the price.

 wayneuk 254 points

yes they are great do you have any jitter like tibor

 AlexGe 3 points

no, I don`t have jitter on my servo. I am using this: 343000003 , 4turns on servo also use this: HK-3EC01

 LasseK 558 points

AlexGe, did you have jitter before applying 343000003 and HK-3EC01?

 AlexGe 3 points

I didn`t try it without ferrite ring. Now, I can not verify, the servo wires are soldered inside gyro.

 wayneuk 254 points

what voltage are you running them on also what rx iam using a futaba 2.4 6ex radio & rx r607fs at 5.5v with no problems & defo no jitter

 fireball412 414 points

Mine do not jitter either.

 AlexGe 3 points

Try to use this - PRODUCT ID: 343000003 4-5 turns of servo cable

 LasseK 558 points

Tibor, if you just have a single servo to the RX, does the jitter disappear then? How many servos do you have connected to the RX? What is the capacity of the ESC (voltage and amps)? Do the servos work well with a servo tester? Under what circumstances do you see the jitter (motor at full throttle, or when everything is idle)? Sorry, lot of questions but it's hard to understand why you have problems without more details!

 Tibor 1 points

when everything is idle

 LasseK 558 points

OK, does it help to disconnect all servos except a single one?

 wayneuk 254 points

no jitter on mine

 wayneuk 254 points

this servo is great

 fireball412 414 points

I did not test it myself. However, beastx provides a long list of servos and recommends the update frequency. This list shows only few servos that work with more than 300Hz. Thus, I would not use 490Hz. Personally, I would use not more than 100Hz since this is one of the cheapest digital servos ever.

 Ltomi78 43 points

I used it with rabbit fc as a gimbal servo for quick response, where you can set also 270hz and 400hz for servos. It works with 400 hz so I think it would be good until 499Hz.

 fireball412 414 points

There is generally no reason why a digital servo should not work with any receiver. Some receiver provide a special high update rate mode that is only for digital servos. Thus, analog servos can not be used in this mode. But the way around there is no problem.

 wayneuk 254 points

one you can not use over 5v the other is ok at 5v or more i use them i love this servo i have the 6v version they are brilliant for the $

 62Soulman 1 points

Thanks Wayneuk,
but you haven't anwered my question, or maybe I haven't asked clearly. If HK has two versions at the same price, it must be pros and cons for each of the two models. I guess my real question is what are the strong points of the 5V servo?

 LasseK 558 points

Soulman, this servo is specified both at 4.8V and 6V, so we are not talking about two different servos, it's the same servo. If you power it with 4.8V, then you get the performance specified at that voltage. If you run it with 6V, then you get the performance specified for that. So the point is, you get a little quicker and stronger servo when you run it at 6V compared to at 4.8V. I run mine at 5.5, haven't tested neither 4.8V or 6V. You should stay within the range of 4.8 to 6V, but any voltage within the range should be OK. HTH

 62Soulman 1 points

Lassek, very humbly, I don't think so. It's two different servos, different model number and, if you look at the pictures, one is clearly marked 5V the other 6V. I have done a bit of web research and crafted myself an answer: unlike analog servo, where 1V delta just means a bit more/less speed/torque, digital servo can maximize that 1V, run the 6V at 5V and you'll get a lot less performance (probably 30%/40%) run the 5V at 6V and you'll burn it out in no time. I guess the motor in the servo is fine tuned to the supply voltage and in digital environment 1V makes a world of difference.

 LasseK 558 points

Sorry Soulman, I misinterpreted the question. The HKSCM9-5 only is optimized for 5V and will fry with higher voltage. The HKSCM9-6 is specified for the whole range 4.8V to 6V, but has lower performance at lower voltages. But to address the question about the two versions, I would say that the determining factor is your ESC or BEC. If the ESC outputs 5V, then you should choose the HKSCM9-5 for best performance. But if you have 5.5V or 6V from the ESC, then you must select the HKSCM9-6 to avoid servo damage (if you want a HKSCM9 servo). In general, when I have a choice, I go for higher voltage (to reduce cable losses). When you have really strong servos, it is an advantage to go HV, in order to keep servo amperage down. For these smaller servos, this isn't so much of an issue unless you really have lots of servos in the model. It doesn't matter if the servo is analog or digital, the torque is related to the voltage. So if you would have a 6V analog servo, that servo will lose some torque and speed at 4.8V, same as the digital ones. In short, I would say that your ESC/BEC determines which servo version to choose.

 wayneuk 254 points

actuators are driven in synchronism by a digital controller implemented on one-chip

 wayneuk 254 points

depening on what your trying to pan & tilt i would say yes....its a good servo not sure if i would pan & tilt a gro pro with it a board cam yes more than suitable

 __Thai 41 points

Thanks. Yes it'd be for the Sony 600tvl board cam.

 wayneuk 254 points

yes it will move that with no problems

 Ral fRotten 1068 points

I have them in my bixler, after a multitude of crashes they still work great. I have 5 of them in various foamies and have never needed to replace one..... (none of the planes weigh over a kilo). The foam may take some of the stress in crashes, or maybe they only like major crashes! I think you've been unlucky,

 wayneuk 254 points

ive bashed crashed & trashed my plane servos are still working.. there great little servos imho better than the hxt900

 Arxangel 890 points

These will work fine on the Radjet with the stock motor. :)

 mohammad 34 points

yes they will do fine i used them in fine and they work so good

 LasseK 558 points

I wouldn't do that, the Zephyr specifies high torque metal gear. These servos are plastic gear and they don't have that much torque. I would go for XGD-11HMB or similar (cheap but metal gear, digital, ball bearing and really high torque for the size).

 Luca 25 points

Yea... I see.... But the problem is that i need them fast, so they need to be in stock in the NL/DE warehouse .... :(

 LasseK 558 points

Ahh, we don't like to wait, right! :-) Well, how about BMS-380MG then? A bit more expensive, but certainly metal gear and high torque? Just make sure to check the dimensions!

 LasseK 558 points

Or this one (noticed that the BMS-380MG only was one left in stock!): TGY-375DMGplusHS, less torque but digital and metal gear (and 5 in stock!). HTH

 Luca 25 points

TGY-375DMGplusHS should be perfect :) thanks a lot for the support :)

 Ral fRotten 1068 points

*** **** *****

 Ral fRotten 1068 points

Dragonfly, I'm not questioning your findings,... just a thought,... maybe what your using to test them may be slightly variable as well....I wonder if you used a second servo tester whether you would get the same results on each servo?.......... I have these servo's in a few planes and I like them, there tough and have survived a few "incidents". The way I fly they just have to work, accuracy is not so important. Have a nice day

 Arxangel 890 points

I think people have been using the with great success on 450 helis. I can vouch that the servo is VERY precise, smooth and strong, with no slack in the gears.

 Chubbs 24 points

Absolutely, yes. I used 4 of these for my HK450V2, even used one for the tail servo. I had no problem with any of them. I stripped out a couple of them in a crash, but there is still at least one on the swash that has been through 50-75 flights at least, with no issues. I eventually replaced the tail servo with a better one, but noticed no real improvement with the more expensive servo.

 LasseK 558 points

Could you explain what you mean with "they all differ in centre position"? Do you mean mechanically, that the servos don't have the exact same centering position when looking at the servo arms? In that case, that's just how it is... :-)

 Arxangel 890 points

I think its normal. I have 7 of these and some are centered, some are just a bit off center. Otherwise they work flawlessly and extremely smooth and precise. You can use the sub-trim functionality on your programmable radio to adjust the center position. That way you can center all of them.

 Dragonfly 22 points

Dragonfly 21 points - 1/30/2013 It is exactly as you discribed in you following description. I have 7 of these and some are centered, some are just a bit off center. Thank you both for your answers. Regards

 Ral fRotten 1068 points

Does the servo tester have any variance as well?, do you get the same results with a second test unit? ....just thinking......my servo tester cost $2.50, I use it to confirm the servo actually works and to centre them on the plane, I would not rely on it for too much accuracy.

 WickedTRX 138 points

Yes it will

 Perdification 42 points

There are some people running this servo up to 333MHz, so you can try!

 Arxangel 890 points

Well, this is a digital servo, so I see no problem there. :)

 Ral fRotten 1068 points

Nicads are 1.5v/cell X 4 = 6volt

 uavflyer2k 10 points

Actually NiCd and NiMh batteries are rated for 1.2V (*5=6V) this is, of course nominal voltage and it is possible to see 1.4 to 1.5 just off of the charger, but that will quickly go down to 1.2 to 1.3V per cell.

 Ral fRotten 1068 points

You got my curiosity going, I have a 4 pack of nicads in my servo tester, they have not been charged for about 3 months, across this pack of 4 nicads I got 5.2volts (1.3volts each). I also have them in my transmitter which I had just charged a week ago and have not used them and they were reading 2volts each!! they are branded Ultracell 2500mah (and they do have 1.2volt written on them)............ I suspect they will be 1.2v under load,......or my multimeter is not accurate enough to get correct readings at such low voltages. In essence you are correct they do have written on them.

 golys 100 points

2volts each is too high one cell should be 1.6 full(when charged),1.4 to 1.3 after charge ,nominal 1.2 ,dead below 1,, if your max volt is 6v use no more the 4cell, as 5 cell max voltage is 7v(1.4*5)

 Ral fRotten 1068 points

I've been using them for a few months now in my Transmitter, I've only charged them once mid November, both the TX and the battery's have given me no problems, I use the TX nearly every day, for 20-40minutes depending on how many battery's I put in my planes...anyway these servo's are great!!

 Arxangel 890 points

Well, the ESC would depend on the draw of the motor, no on the voltage the servos require. In any case, the Plush ESC supplies only 5v. The Multistar ESCs supply 5.5v so you might be better off using them.

 Arxangel 890 points

Yes, it fits perfectly in the frame.

 Stretton74 39 points

I got some prior to go in the versus glider in yellow , can see them through the wing also I killed one when soldering cutting out the plug so if doing this be quick don't let the heat get to the main board. White is better so changed out servos in my glider no yellowing in the wing now great servo awesome price compared to other overpriced servos.

 Ral fRotten 1068 points

Opps see above!

 Arxangel 890 points

Can't say that I do. If you have a red wire in the middle, you pretty much know what the other wires are. I've never had problems on account of servo or ESC wire colors. :)

 TignMeg 68 points

I'm pretty sure the colors are brand dependent. Not 100% sure but I think the Black/Red/White is what Futaba use and Brown/Red/Orange is what $pektrum use. There's also Black/Red Yellow. There's no international standard for this except they all seem to keep the red (positive) in the middle and the dark colored one is always the negative.

 waterlogged 2280 points

That servo would certainly do the job. The best thing is to find a micro servo with 5 stars and read what the reviews say. A number of them are used in 250's or 450's. Centering is very important so make sure that it's mentioned in the review. The HKSCM9 is new to the market but it's specs certainly make it a good contender at a good price.

 Noobie 69 points

They sure work, I have used them on both the 250's and 450's for my cheap setups.