I was actually reading up on this subject earlier, and chances are boat efficiency is very closely related to airplane efficiency. One big thing I found is that jet drives are not as efficient as props. Just like planes, you will gain efficiency from large diameter 2 blade props, more blades=more turbulence.
No idea on hull design and water interference yet, haven’t looked into that enough.
Quote:
Originally Posted by Andrey
You're a little underpowered probably. I have a '96 Boston Whaler Dauntless 15 with a Honda BF60 4-stroke and get 8-9mpg.
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That is really disappointing. I believe the BF60 engine is closely based on the 1st gen insight engine, and comes with lean burn.