Hi ive just dug out my first plane from the attic that I learned to fly with years ago Its for my son and I have recovered it and stuck a new engine in it but I can not remember where the C of G is

Is it 1 third of the wing cord back from the leading edge ?

It a hi boy wing not shore about the fuz but its similar to a hiboy

many thanks
Geoff

Geoff:

If you start at 1/4 of the root chord it will fly. After trying it, you might want to move it back, but 25% almost guarantees safe operation.

Bill.

If it is a constant chord wing, the c.g. is usually about 1/4 of the chord from the leading edge. This works well also for a tapered trailing edge if the leading edge has no sweep back. Use the longest chord line, usually next to the fuselage. If the leading edge is swept back (or forward), that's a whole different situation and you probably don't want to know. If you do, I'll send you a web sight that explains the formula (I can't remember it right now and I'd have to do a little research. Seems like it's on the AMA web site but I'm not sure).

William Robison & PWM

thanks for your quick responces
I will set it at 25% and sea how I get on

Geoff