ORIGINAL: raynman
OK,
I found the 25% MAC and tried the balance at 25-28% CG This plane is VERY tail-hevy at that spot. At around 30%(slightly fore of the spar tube) it is still tail-heavy, but less.
This cannot be, 30% CG is more 'Tailheavy' Than 25% if the airplane is truly balanced at that point and sittling level when supported at that point. Move the CG (balance point) toward the tail and it becomes tail heavy, move the CG toward the nose and it will become nose heavy.
John