boat running slower in heat and humidity
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Boat is propped for the cool weather. When the temp & humidity go up the same prop will make a big difference since you are now down on H.P. & will be down on speed since now the prop is too big for the HP killing even more speed. If you were to prop down to get max rpm, you will gain some of the speed that you lost. You gave the RPM of the engine with the slower speed, what was RPM on the faster runs?
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Something does not compute. If you ran 84 @ 5100 rpm & you ran 75 @ 5100 rpm either you have messed up a prop, boat has gained a lot more weight, tach is wrong, or ??? Same prop, same boat, same weight the RPM's should be down on the 75 mph run compared to the 84 mph run.
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I thought the speed losses listed above seemed a little excessive but, depends on what the weather was when the baseline runs were taken. Might have been the 180 degree opposite extreme (60 degrees and 25% humidity).
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Pure Energy
General Boating Discussion
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07-30-2002 09:15 PM