I just completed a sportscale model of Spaceshipone and was wondering if anyone has any reccomendations as to where the CG should be? I was told that one way to do this is to draw a straight line from the leading edge where it meets the fuse to the outboard trailing edge. Then draw a second straight line from the trailing edge where it meets the fuse to the leading edge at the wing tip. Where these two lines meet is where you would establish a chord liine on the wing. From that line you would set the CG at say 25% back from the leading edge at that point. In the first picture the back edge of the stick on the wing is at 25% by the method I just described.

To me this CG position seems pretty far forward. In the second picture I have the plane balanced as it naturally came out. Here the CG is about .5" behind the 25% of the wing chord.

Since this aircraft is designed to be a glider and certainly not aerobatic a slightly nose heavy balance probably will not hurt anything.

Any ideas on if I am on the right track or if there is a better way to figure this would be appreciated.

Regards,

John B.