prop problem

Question
hi again ron

i do my fishing in the west coast of scotland
the prop i have is slightly larger than originali intend to put a small bolt thrugh the hole in the prop that lines up perfect with the hole in the shaft that way when the shaft spins the bolt will hold it on to the shaft i just wondered if it could damage my engine by doing this.
cheers
stevie

Answer -
G'day Stevie

Thank you for selecting the undersigned to respond to your question.

First of all, where do you do your boating and fishing? Chances are I might be able to obtain a replacement prop and send it to you, but I need to know the model & serial numbers of the engine.

I conclude the shaft size on the replacement prop is larger than the prop you lost. I'm not quite understanding how you could put a bolt through to make the prop fit the shaft securely without slippage and damaging the shaft's splines.

If the diameter of the replacement prop is larger than the one you lost, that's not necessarily a problem, nor is the pitch. What you have to consider is the performance of the engine. In other words, will it take more or less power to get your boat up to speed so to speak and plane. Best you test the replacement prop first to see what type of performance you're getting.

Good luck and safe boating.
Ron

Answer
Stevie

I now get the idea. So, the centre diameter of the replacement prop is the same size as the prop shaft on the engine, and instead of using a shear pin on the shaft, which easily breaks,you intend to use a steel bolt. That's fine, but if you strike something solid, the bolt may not shear off or break. Consequently, you could end up severely damaging the engine and the prop shaft. It's not worth taking a chance, then finding yourself stranded without any power to reach safety.

Ron