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Jim/Brent. I can't see the need to calculate battery usage at full
power. Surface travel is the most likely place for full power usage, while
submerged travel is usually done at much less. I plan on using an outboard motor
for most surface travel, and then bringing the small outboard either inside or
loading it onto a surface boat while diving. Again, using a larger motor at slow
speed is more efficient than using a smaller motor at full speed. The prop
losses are a large part of that equation. Bigger prop turning slower is way
better. Frank D. |