I had a Lion mfg Cap 21 that lasted 15 seconds. The cg was right on the factory marks on fuse. Since then I have learned on the 231's and Chipmunk to reflex both ailerons UP 1/8 to 3/16" to create wing tip washout and have cg at least 1/2" ahead of suggested point. These will get you past the maiden flight with a complete plane and you can adjust back as you gain feel. Also, watch the elevator max. throw to keep it at the minimum also.