I know I can sustain about 4.5 knots over any significant distance in my boat.
The speed vs drag curve for my boat shows that speed has 5 pounds of drag.
Therefore my sustainable thrust is 5 pounds.
Next I looked at the curves for some short boats and some 14 foot boats and saw at a drag of 5 pounds there is about half a knot difference.
Gedi Convertible Helmet
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