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Mar 09, 2013, 09:04 PM
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Question

How big of a battery do you need for servos


How large of a battery do you need for futaba S9402 and S9001 servos? I want to use lipo or life battery. Futaba says both of these servos can draw alot of amps, but they dont say how many. Thanks Mike
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Mar 09, 2013, 10:09 PM
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Mark Wood's Avatar
How many servos, how big are the control surfaces they will control, how many flights do you want to get out of the battery, etc. You get the idea.

mw
Mar 10, 2013, 12:09 PM
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Is there a calculation table or something like that ? This is in my 1/3 scale Pitts 50cc. There are 4,S9001s in the wing, 2, S9001s on the elevator, and 1, S9001 on the throttle. 1, S9402 on the rudder.
Mar 10, 2013, 01:01 PM
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Bear in mind also that servo (and battery) plugs have a limit to how many amps they will carry. Most people with 50cc planes us a second rx battery, i use a li po battery and a regulator that has two outlets so i can power the rx with two seperate plugs (and on/off switches)
If you are using a life or lipo battery through a regulator i would imagine you will have plenty of power for high draw servos.
Mar 10, 2013, 01:12 PM
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Might wanna poke around the Giant Planes forum too.

https://www.rcgroups.com/giant-electric-planes-477/

mw
Mar 11, 2013, 04:49 PM
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Quote:
Originally Posted by BIG STUFF
Is there a calculation table or something like that ? This is in my 1/3 scale Pitts 50cc. There are 4,S9001s in the wing, 2, S9001s on the elevator, and 1, S9001 on the throttle. 1, S9402 on the rudder.
Those servo's aren't very powerfull.
What sort of flying do you plan to do with your 33% Pitts?
Mar 12, 2013, 10:04 PM
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Just sport flying. For now.
Mar 13, 2013, 12:56 PM
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cryhavoc38's Avatar
Quote:
Originally Posted by BIG STUFF
Just sport flying. For now.
ok

BUT, if those servo's are new and you can return them or retask them, I'd suggest some servo's that are in the 200+ oz torque range for the ailerons and in the 300+ range for the elevators and rudder.

Thats if you plan to go all crazy 3d with it eventually.
Mar 15, 2013, 08:29 PM
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Thanks for all the good advice and info guys !!!!


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