ORIGINAL: triumphman49
Does anyone know the prop shaft size ?
Seeing this new engine seems to be exactly the same as the old 40 (except maybe the head button) then the prop nut is 6mm with its brilliant captive prop washer. The prop shaft is a stud that screws into the crankshaft and has different length threads either side of the 1/4" machined section to handle thin and thick prop hubs. Using a stud is far from a new idea but, because it saves bending crankshafts, it should be standard fitting on all engines.
The company name is Northern Velocity, shortened to Norvel then shortened even more to NV but I can't remember how the AME fits in.