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Old 15-03-2016, 19:02   #1
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Location: Port Townsend, WA
Boat: 37' Samson, Ferro
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Increase Prop Size?

I have a 10HP Sabb diesel with the standard 2 blade 17" variable pitch prop that is manufactured by Sabb for the engine.

I wish to repower with an 18 hp Sabb with the same clutch for the variable pitch shaft/prop. (Same footprint and shaft connection.)

My question: In order to increase power and speed of the boat to match the power increase of the engine, would I need to increase the prop size?

My quandary: In order to increase the propeller size I would need to cut a larger space in my rudder/hull to make it fit. If I go with a 3 blade then I need to look at different F/R gear box and drive shaft.
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Old 15-03-2016, 19:17   #2
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Re: Increase Prop Size?

No, usually your diameter is limited to 15% of the diameter clearance from the hull anyway. With the vari pitch and more HP you will likely end up fine.
"I spent most of my money on Booze, Broads and Boats. The rest I wasted" - Elmore Leonard

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