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Old Jul 17, 2012, 09:59 PM
Registered User
Joined Oct 2007
5 Posts
Help with motor and esc match

Thanks for the help in advanced with this, I looking for someone to try and explain to me how to match the right size esc and battery for the specific motor, I'm not so new at RC but am new on building and setting up my own models so to speak.

The first project is a sailplane with 2 brushed speed 400 motors, would I need 1 or 2 esc's and which size along with recommended battery.

The 2nd project is an A-10 with using 2 of the following
what esc do you suggest and is it better to use 1 or 2 of them, and what battery also would you suggest (preferably Li-Po)

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Old Jul 18, 2012, 12:47 AM
Reduce the drama...
rick.benjamin's Avatar
USA, OR, Damascus
Joined Apr 2004
4,045 Posts
First project: each motor should get it's own brushed ESC, even though one ESC could serve two motors.
ESC size depends on how many amps each motor and it's prop draw.
Amps x 125% = ESC size in amps or greater (see 2nd project for example)
The motors were made to operate within a voltage envelope. I would choose based on the
upper end of that envelope.
Battery size depends on how much weight the airframe can support and still fly.

Second project: The EDF specs are 12.6 volts at 28 amps max.
Size the ESC by multiplying by 125% 28 amps x1.25=35 amps
Get an ESC for each EDF. As HobbyPartz doesn't have 35 amp Air ESCs, choose a 40 amp that supports the battery of your choice (3s, 4s)
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Old Jul 18, 2012, 03:03 AM
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Staffs, UK
Joined Nov 2003
11,158 Posts
With brushed motors you can use one ESC for the pair and that's what I've always done. A 30A ESC will be plenty for 2 x S400s because you shouldn't run them much over 10-12A each. What battery will depend on exactly which S400s you have. There are loads of different ones with very different specifications. A 2S Lipo is a fairly safe option if you want to use a lipo.

Brushless motors must have an ESC each. You'll have to decide for yourself what size battery you want to use, 3S or 4S and if you want to use a single battery it will need to be a biggish one as you'll be asking for around 60+A out of it.

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Old Jul 18, 2012, 10:25 AM
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Joined Oct 2007
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Thanks a lot! thats the answer i needed
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Old Jul 18, 2012, 12:53 PM
An itch?. Scratch build.
eflightray's Avatar
South Wales U.K.
Joined Mar 2003
14,416 Posts
One slight alternative to a 2s Lipo and motors in parallel off one ESC, is the motors in series with one ESC and a 3s Lipo. Though you should check the props and amps draw are still suitable.

I have a GWS C-47 (brushed motors), that flew on 2s with the stock motors and props, having destroyed both props and having plenty of the small Gunter props, I switched the motors to series connection fitted the Gunter props and found that I could run it on 3s, (I also had plenty of 3s packs). Flies great.
Although the volts went up, the series connection meant the motors were still well within spec and actually drew less amps.

Sorry if I have complicated or confused things.
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