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1964 18hp prop change

valvebounce

Regular Contributor
My motor wasn't reaching full revs(WOT)
I had a 9.25 X 11" prop on it.
The boat is a f/glass 14ft Broome Gemini speed boat kitted out for sea fishing.
I think the boat(although not a heavy boat) was too heavy for the above prop.
I changed the prop to a 9" X 9" prop,and now the boat gets on the plane no probs.
The bigger prop was putting out a wide wake with no centre trough,and the boat wouldn't plane.
I'm toying with the idea of adding Doel fins,anyone tried them in a similar situation?
 
I would not use a fin on that motor. Reason being the aluminum on the cavitation plate isis thin has a good chance of cracking.
 
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