The glider as monoplane balances at 2-1/2" aft of the top leading edge.
As the biplane, it balances at 3" aft.
The long tail has lot to do with the aftish normal c.g.
I'm going to do a tail-ectomy to get the c.g to 25% on the monoplane...
..
Moved the horizontal forward one chord... 3".. rebalanced as a monoplane to 25%.. 1"
Added the lower wing @ 4" aft, found the new c.g. without changing weight.. 1-5/8"
Glides well.
.
Palos r/c...
http://www.palosrc.com/instructors/cg.htm
Jean-Claude..
http://perso.wanadoo.fr/scherrer/mat...glish/mce.html
Ask DJ ...
http://www.djaerotech.com/dj_askjd/askdesign.html
Andy Lennon...
Page 8
Martin Simons
page 222..