asp 91 stroke throwing the prop
hi.
I bought new my asp 91, installed it with a 14x8 prop. ran ok. second time ran for about a min and threw the prop. this is with a lock nut, the woodroffe key in place, exhaust ports ok, and a suitable spinner. this now happened three times. running on 10 per cent nitro, always been ok before. prop drive in good shape, we are all out of ideas here, any thoughts please.
mike