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post #11 of Old 12-15-2012
Courtney the Dancer
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Re: overpropped vs underpropped

Lance- I'm not telling you what to do but using your analogy when you have your throttle wide open on the boat and you aren't able to achieve the manufacturers WOT rpm you ARE lugging the engine just like your Jeep when you have your foot in it and can't accelerate because of too much load. That extra load from too much prop/pitch is present throughout the rpm range but you can only tell when you try to reach WOT. Your engine is pulling it's guts out trying to get there but just can't (just like when you have to shift in your Jeep). By the way, your use of WOT in reference to your engine is incorrect. WOT is the manufacturers required maximum rpm under load, what you are referring to on your boat is the maximum rpm attainable with your over pitched prop at full throttle which is 600 rpm below WOT. Sorry, not meaning to go off on you, this is a very common misconception that results in various expensive engine problems. There would be absolutely no reason for the manufacturers to even bother to establish the WOT for their engines if it wasn't important.

SV Laurie Anne

1988 Brewer 40 Pilothouse

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