Thread: 225hp lehman
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Old 11-11-2012, 09:16 AM   #10
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Most displacement boats will be cheapest to operate at the square root of the LWL times .9 to 1.15 .

There is usually very little difference in burn between these speeds .

Check with the eng mfg for the lowest long term RPM restrictions.

Usually a simple look at the mfg lit will show a HP graph of some sort.

Where it starts at the lowest RPM is a good clue .
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