RE: FRB 600 Fan Trainer prop or blade question?
Mark
This is built from some old kit that I don't know about. It has wingspan of 71" and length of 64". Recommended engine on plans is Webra Speed 50 but no mention of prop type or size.
Shroud's inner diameter is 9-1/4" therefore I'd say 9" would be the biggest prop/fan blade that could be installed on the engine.