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Old 01-30-2014, 07:18 PM   #2
fhhuber
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Depends on the 50cc size plane, which control surface and how you plan to fly it.

You could fly a 50cc Extreme Flight Yak with as low power as 110/130 in-oz rated HS-5625 ALL AROUND for very mild laps around the field... but you need 180+ in-oz on elevators, 200+ on ailerons and 250+ on rudder for aggressive 3D... 333 in-oz HS-7954 all around would be a good choice for ensuring you have the power for everything the plane can do...

http://www.servocity.com/html/hitec_servos.html so you can find the in-oz to kg rating convesions by looking up the servos I mentioned.
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