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Author Topic: hit and miss Boat N91  (Read 508 times)

SlowArrow

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Re: hit and miss Boat N91
« on: September 10, 2019, 03:22:41 pm »
I love that video!  I was struck by how well that smooth water shows the "hull speed" or maximum speed of a displacement hull.  The Hull Speed limit is the result of the drag caused by the wave created by the hull moving through the water.  The wave (peak to peak) gets longer the faster the hull moves.  When the length of the wave equals the length of the hull at the waterline - that is as fast as you can go (unless you get on top of the water and "plane").  You can calculate that speed in Knots by multiplying the square root of the hull length at the waterline (in feet) by 1.34.

Sorry - just too many memories of the naval architecture classes popped into my head while watching that.  8)
Mike