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Servo selection help

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Martin Rowe 118/01/2015 20:41:08
119 forum posts


I am lucky enough to have got my hands on a blackhorse chipmunk.

so I need some servos for it. Seven of them! It's a standard four channel plane with two aileron and two flaps.

i would like metal geared servos. I am not sure if I want digital of not?

The plane will weight 3.5 kg ish.

whats everyone using?

Jon - Laser Engines18/01/2015 20:47:09
5513 forum posts
268 photos

It needs nothing more than standard servos. Futaba 3003/148 etc. Hitec 311/322 etc

Don't be tempted to over power it either. The full size chipmunk is no missile. A decent 60 or at most 70 4 stroke will be enough to give a scale performance

Edited By Jon Harper on 18/01/2015 20:47:27

Martin Rowe 118/01/2015 20:48:49
119 forum posts

How about these?

i don't have a engine yet, I would really like a two cylinder but they cost...

Martin Rowe 118/01/2015 20:53:04
119 forum posts

Do you mean these?

do they do a metal version?

Paul Marsh18/01/2015 21:12:15
4032 forum posts
1219 photos

I bought one a couple of years ago from a swopmeet for £45. With a brand new Spektrum AR 6210 DSMx rx, a new SC 46 engine and all servos, new battery, infact just to bind n' fly.

Standard servos will do, but did replace the flap ones, as the rest were 148's,but the flaps were Gotek ones, which a were suspect, so replaced those with Hitec 422 ones.

bh chipmunksmall.jpg

Edited By Paul Marsh on 18/01/2015 21:13:54

Martin Rowe 118/01/2015 21:15:05
119 forum posts

Wow at really was a good deal.

i,am think elec one of these

hk have three types 300kv 500kv 400kv, do you know what that means?

Ernie19/01/2015 07:55:58
2530 forum posts
21 photos

Hi Martin, Have a look at Steve Webb's servo shop on the web. All the popular ones are listed, with torque, speed etc. Also, it's a great traditional model shop.


Pete B - Moderator19/01/2015 10:37:28
7656 forum posts
734 photos
Posted by Martin Rowe 1 on 18/01/2015 20:53:04:

Do you mean these?

Those items are counterfeit servos. Martin - believe me, you'll not get 4 genuine Futaba S3003 servos for £12....

Depending on your budget, you have the choice of buying at your LMS, where you should get appropriate advice for your requirements, buy online at one of the mainstream retailers such as Servoshop or one of the many others, or you can look at retailers like Hobbyking or Giantshark where you tend to get a bit more for your money.

The 9g digital servos you referred to in an earlier post are unsuitable for the Chippie - as has been said standard-size servos are fine. 9g servos are much smaller and do not have the power of a standard servo. They do not need to be digital either - analogue are fine for most purposes.

If you are thinking of going electric, have a browse of some of the sticky tutorial threads here - there's plenty on leccy systems and if you have any specific questions we'll do our best to answer them.

I think that leccy motor will probably be too big for the Chippie - before you spend money, best ask here...wink 2


Pete B - Moderator19/01/2015 11:03:53
7656 forum posts
734 photos

Have a read of this thread, Martin - it's a conversion of a BH Chipmunk to leccy and should be very helpfulthumbs up


Engine Doctor19/01/2015 11:04:10
2512 forum posts
39 photos

Don't whatever you do buy any cheapo servos labled Futaba or any of the other main makes from sites like e bay they are dangerous fakes. The last ones that appeared at our club were in a pattern ship . I was asked to test it as the owner said it didn't feel right. To cut alss when I removed and stripped one of the servos a gram or so of swarf and solder debris fell out . The quality of all components was rubbish and they were imediately grounded. There are hundreds on eBay even from uk sellers .They tend to say they are "not genuine futaba but replacement / compatible"so beware , buy from a recognised source or local model shop .

Biggles' Elder Brother - Moderator19/01/2015 13:37:11
15748 forum posts
1460 photos

Hi Martin,

I converted a BH Chippie to electric about 6 months ago - you'll find the thread here. Its not a difficult conversion, but its not entirely straight forward either! You might like to take a look through my "adventures" prior to deciding which way to go.

You should also be aware that BH have modified the kit. My conversion was based on an old version that was IC only originally. The later ones are already set up for electric or IC.


Martin Rowe 119/01/2015 21:37:19
119 forum posts

Ye I think mines the old version as it has no hatch to fit remove batteries.

I looked at the servo shop, my problem being I have no idea how much torque or if I want digital or not. My head hurts

Martin Rowe 119/01/2015 21:42:39
119 forum posts

What did you guys think of the e max ones? I can get them from bang goodbang good

Pete B - Moderator19/01/2015 21:51:23
7656 forum posts
734 photos

The answer is in one of the earlier replies, Martin - we don't post for fun!smile


Martin Rowe 119/01/2015 22:13:27
119 forum posts

Arr i see I used the wrong link I meant these

thanks,for your help, I am grateful

Chris Bott - Moderator19/01/2015 22:19:26
6837 forum posts
1429 photos
1 articles

The very first answer you had Martin were very good suggestions.

One was this Futaba 3003

Martin Rowe 119/01/2015 22:20:20
119 forum posts

Thank you

Martin Rowe 119/01/2015 22:21:32
119 forum posts

Whilst I have you attention is 0,61 2 stroke = around 20cc in petrol?

Former Member19/01/2015 22:23:40

[This posting has been removed]

Martin Rowe 119/01/2015 22:29:54
119 forum posts

Ye, thank you. I'll go for those

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