Thread: 8mph 8mph 8mph
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Old 03-29-2018, 02:31 PM   #47
koliver
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City: Saltspring Island
Vessel Name: Retreat
Vessel Model: C&L 44
Join Date: Nov 2007
Posts: 5,663
I prefer to think of the theoretical Hull Speed of 1.34 x WL as the speed at which you are making a wave in which the boat just fits. You are not climbing, nor are you exceeding the length of your own wave. If you like going faster than that, your bow remains at the front of the wave. After all, it is your bow that is initiating the wave making, so by definition it must remain at the point of origin. Since the wave dips to a low point 1/2 way back to the stern end of the wave, if you travel in a wave that is moving faster than your hull speed, you will always be travelling in the front portion of that wave, so your stern gets further from the stern end of the wave as you go faster. As your stern moves towards the low, middle of the wave, it "squats".
We are all familiar with the concept of needing more power, hence more fuel, to go up hill. That is exactly how the boat is acting, with the bow always at the top of that hill and the faster you push it, the stern getting further down slope.
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