t. stewart,

Mine has a Magnum .75 in it, everything balanced good. I got mine into an inverted flatspin with an extreme aft CG. I only did it once and haven't been able to do it again. Seems like I am over controlling the ailerons and making it roll out instead of flattening the spin. If someone figures out the secret, let us all know. Otherwise it hovers great, harriers pretty decent (mine can go slower inverted) and is fun all around.