piper J-3 cub
 

C>G. piper cub J-3 clipped wing 83in wing span

RE: piper J-3 cub
 

It might help to know which ARF or kit you have. My 1/5 Sig (84.5 inch wing) c/g is 3-1/2 inches behind the leading edge. My Hangar 9 Cub (80 inch wing) is 3-1/4 inches behind the leading edge. I think if you start at about 3-14 inches, you'll be okay. Both of mine are full span, but that shouldn't make a difference.

RE: piper J-3 cub
 

well I'm currently building a Great Planes 60 J-3 CUb which is 83" clipped so I'd like to think it is this plane. I'm building it full span since I plan on putting floats on it or carry a camcorder. the center of the CG is at thr rear of the spare according to th plans. the instructions say 4 1/2 inches which is what I measure on the plans. the ARF and the kit are identical so 4 1/2

RE: piper J-3 cub
 

Im not sure who made this plane? The guy has passed away.

But it looks just like the one in the tower hobbie catalog which is Great Planes.

RE: piper J-3 cub
 

redfox is probably correct. What is the chord of the wing (leading edge to trailing edge width)? If it is the larger scale plane, the c/g is probably further back than what my planes are.

RE: piper J-3 cub
 

The chord is 11in.

RE: piper J-3 cub
 

Given your wing chord, the scale has to be no greater than 1/5. My 1/5 Sig has a chord of 12-1/4 inches, and my 1/4 BUSA plans show a chord of 16-1/4 inches. So..... I figure your plane is a full-span of some sort. I would go with the more forward c/g like my planes have. I think you'll be safe with about 3-1/4 to 3-3/8 inches back from the leading edge. Even if by odd chance it is a larger scale with clipped wing, your c/g will be too far forward, safer than too far rearward. The Cub has a lot of elevator authority, and will fly controllably nose heavy. But..... I doubt it's a larger scale, so I think it will be fine.

RE: piper J-3 cub
 

mine has a 13" chord so it's not a GP 60 cub. either a sig 1/5 scale or a GP 40 cub with a full span

RE: piper J-3 cub
 

Thanks everone I think I got it now.

RE: piper J-3 cub
 

Thanks everone I think I got it now.