Great info BigEasy- nice to hear some theory and also what your engine/drive/ prop setup is. I am sure that the tach is reading around 4000 at wide open so Ill focus on the prop. Seems strange as the motor doesnt have much trouble getting to its 4K. I have a 15x15 prop that just arrived UPS that I need to try. Will post results.
I guess somewhere around 40 mph is right with this combo, thank you for sharing your performance info OldFielder. If you could share your prop size Id appreciate it.
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