The instructions for my electric sailplane say to balance 68mm from LE. When I check CG using GP CG Machine, the plane shows to be VERY nose heavy even with the battery shoved all the way back to the servos for the tail feathers.
When I look at the figures:
68mm ~ 2.68" ~ 2 11/16 ".wing chord 7 1/4" tapered LE to 5 7/8" at the end of the aileron.
If I take 25% of root chord, I get 1.81". " " 30% " " " 2.18".
Seems to me that there might be a misprint on the CG. If the figure was 58mm ~ 2.28" ~ 2 1/4", I'd be very close to balancing.
Comments........
David