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Old 10-13-2011
PHN PHN is offline
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Propeller Sizing Question - Help!

Ok...I am a newbe so please don't beat me up too badly here, but I have a sincere question I hope someone can help point me in the right direction.

I recently bought a Morgan Out Island 33. The previous owner "swapped" or replaced the engine with a Yanmar 20hp deisel out of ? I suspect he used the prop that was on the boat the engine came out of (SMALL!) and I get very little thrust and don't make hull speed at full throttle.

I know the engine seems small to me for the Morgan 33, but can anyone give me an idea what the diameter and pitch should be for the original prop on the Out Island 33? I will at least be starting off closer to what should push the boat acceptably and can adjust from there...

Thanks...Paul
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