RE: Servos For A 3D Gas Plane
these are on my 27% and 33% planes
Hitec 5985's for the ailerons
Hitec 5955's for the elevators/rudder
On the ones with JR servos I have
8411's and 8611's
Stay away from JR sport servos for gas planes. They get sloppy quickly from large glow and a gasser with eat them alive quickly.
I tried the JRsport on the throttle of a 2.3M Comp-Arf Extra which promptly lasted 4 flights.
As far as determining what torque to use I always add 25% to what the plane calls for, I then find the closest match in metal gear and faster response on a 6volt system.
Most 25% planes will do fine on the Hitec 5985's with torque to spare and they are nice and fast.
Now on the opposite side of the Karbonite gear debate. I use the 6975 (I think that's the number) for most of my throttle servos since they are something like .08 or .10msec. They are Karbonite and have held up well
If you want use the Hitec 5955's use them as they are the servo to have, they will never get sloppy since they are titanium, all other metal geared servos eventually get sloppy which leads to all sorts of other problems