Horsepower at the prop???

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Dec 5, 2003
92
Hunter 380 Fort Lauderdale
I have been having a discussion with a fellow boater who has a 51Hp perkins. He swears that he gets about 47hp at the prop. I say it is much, much less after spinning an alternator, transmission, and all the other stuff? any experts have a ballpark percentage of power at the prop on an inboard diesel? Thanks Brian s/ CREW REST
 
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