RE: CMP Sukhoi SU-31 90 69" CG Help
Sorry to let you in on this little secret on this plane. I have the same plane and put a fpe 2.4 on it to ballance it without adding nose weight. I moved the rudder to the middle to help. The fuse will not support the weight needed on the landing gear. I'll check my manual and check your cg for you. I'm not promising anything but I seem to recall it was somewhere in the neighborhood of 3 3/4 back from the leading edge I remember it being tricky. If I can't find the cg i'll just measure back to my cg lines I had marked on my wing. If you all are interested I have a wing, canopy for it. The firewall is out of the fuse as of last saturday. Beautiful plane though.