I've built and flown 3 G/P Skybolts, all with 1.2 four strokes. The plane usually comes out tail heavy, so the 1.2 helps with balance. Build the aft section as light as you can.

I have NEVER experienced any type of flutter, or loss of control response. But then again, I never use CA hinges.

It's a major pain in the butt to build, but if you build it straight, and get everything aligned and balanced properly, it's a GREAT flying airplane. Re-calculate your C/G by finding 25% of MAC. The plan/instruction C/G is too far forward and makes it almost impossible to land like anything other than a fast brick. Correcting the C/G to 25% MAC makes it a lot better.

May I help you spend your money and suggest 3 incidence meters plus a copy of Harry Higleys' book called BIPES? You'll be way ahead of the game, and happier in the long run if you go that route.

Pat