A bit off topic, but the cruising rpms cited above are much lower than I was led to believe to be best for the engine.
My Ford Lehman 90 runs at 3200 rpm wide open throttle. Cruising speed is 80% WOT, or ~2500 rpm. This yields optimum speed. Temp and pressure and fuel usage(4l/h)the same as if running at 1800 rpm.
Or am I doing it wrong?
The Boat of Laughter and Forgetting
1989 NC 33 #1072