i guess i should have said imfamious T.T. RARE BEAR ARF they say .60-90. 2 stk. read thread on this plane guys are using .90s to os 1.60 2stks up to 1.80 4stks. i'm doing the mods on it to make it live!!!!!! may come in at 12.5 to 13lbs need about 37 oz. or so eng to make it balance w/out adding nose wt.