I also have a Graupner Cap 232 with an Os Fs 91 for power. I flew mine several times before I crashed it. Be careful with this cap, as it wants to drop a wing and go in a death spin. The Thunder Tiger is even heavier than the Os 91 so be careful and don't slow down the plane too much. Try to keep a high speed while flying. Here's the thread of my crash:
http://www.rcuniverse.com/forum/m_12...tm.htm#1229800

Chris