Servo and C of G Question !!!!!!
 

Hi,

Hope someone can enlighten me...... im putting together a Flair GPS Spitfire 90 Kit does it make a difference as to which servos to buy, i have alot of Futaba S3003 the standard ecomony ones, or should i spend more and get S3001 Ball Raced Servos ? does it really matter and make a difference as i need 6 for this plane as i allready have the retract servo.......

Also i brought a Cambrian Mustang Funfly from ebay with a Irvine 25 engine installed, but i wanted to balance it properly before i fly it, but i cant seem to find the C&G measurement for this plane ive tried the manufactures website http://www.cambriandirect.com but it didnt help, any suggestions ???

Thx in advance for any help :)

RE: Servo and C of G Question !!!!!!
 

25% of the mean aerodynamic chord back from the leading edge will be an OK place to start for CG. You can move it back further if you want after you get used to it to suit your flying tastes.

RE: Servo and C of G Question !!!!!!
 

On my 90 or 120 size planes, I've used the std. servos without failure for the ailerons. For the rudder and elevators, I use the metal gear servos.

If you can locate the wing spar, that should be a close starting point. It's usually about 30% of cord location.

On the Spitfire, make sure with gear down, that the axle centerline is out at least to the wing leading edge. Otherwise you'll be replacing a lot of props from nosing over. Also, I'd suggest that you reflex both ailerons up about 3mm to create washout to slow tip stall till you get used to the plane. Most warplanes as you know will snap quickly if you rotate too fast or get too slow on approach.