It is an AK modelsSimple Flier. With flaps up the noze wants to dive, not real drastic but non the less it does. It did snap on me with flaps up. Luckly I was high enough to recover. So what do you think? I was thinking about moving the CG back. Also the Vtail control surfaces looked to be straight with the stabs so I dont think its out of trim real bad or anything. The CG is back a little from manufacture specs but is forward of what the CG calculator spec'ed out. I dont know...