I'd read that a bow wave moves aft as the hull accelerates. In fact, I believe it's a displacement hull's inability to get over the bow wave that results in hull speed. This 4th of July weekend while out on Knock Off I took the following series of pictures. No doubt the wave is moving aft.
4.7 knots at 1000 rpm
5.2 knots at 1200rpm
6.1 knots at 1400rpm
6.8 knots at 1600rpm
7.35 knots at 1800rpm
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