Everbody talks about flutter. I think the biggest cause of flutter is sloppy control linkages, not tapered flight control surfaces. I've flown planes with both, tapered and not, and did not experience flutter either way. The only time I had flutter was with a sloppy linkage. I have a friend that built a tiger 60 with a .91GK Saito and it flies real nice. He made his a taildragger and modified the nose with a wooden 3/4 cowling. Looks real nice, besides real men drag their tails!!