I think fishstu is running f100 on a 20 MA. He reported 33mph and excellent economy which is about whats expected. Not sure what prop he uses, but a 13x15 or 13x17 yamaha semi-cleaver would probably hit the mark. Look into the PowerTech SCD series. They also make a 4 blade which would plobably maximize your efficiency.
I doubt it will jump out of the hole like the old tower but you'll likely double economy with little performance loss.
Maybe fishstu will chime in.
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