>One seems to need to run a diesel engine in the upper RPMs to create a decent load. On my JD, idle (750 RPM) moves the boat at half speed but there is less than a 10% load on the engine. "Normal" cruise speed of 1800 RPM (one knot under hull speed) equals 42% load. "Full" cruise (hull) speed is reached at 2200 RPM with 75% load. 1400 RPM creates only 22% load.<
Sounds like a perfect candidate for a cruising prop.
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