Sorry for asking another PBF question guys. I started wading through the 1100 post thread and decided it might be quicker to just ask

....
my father built a PBF, we flew it three times yesterday. take off and trimming were a non-issue, didnt fly it too fast, was fun while it lasted. twice the little bugger bit us by entering a flat spin that could not be recovered from. once was relatively close to the ground only a broken prop. the second time (third flight) was a bit higher and broke the motor mount rails and crinkled right side pretty bad.
so - what is the recovery from this or could this be set up?
weight 2 1/2 lbs, CG 5 1/2 inches from LE, throws; low 1 inch up/down elevon, high 2 inches up/down.
everything seems to work and fly fine except for these darn flatspins
thanks guys
Hubb