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Underlying Theory The drag is due to both friction, aka viscous forces, and to wave generating resistance.
This seems intuitively correct, but anyone know a more sophisticated one? The red 'x's are values of speed vs rpm I measured last weekend, and the blue line is what the model predicts; I was rather pleased with the fit.
Also plotted is engine fuel consumption in miles per litre and thus range given a 300 litre tank.
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I couldn't find any useful equations relating thrust to shaft rpm in the literature: plenty for airscrews but not for water.
So after some thought I tentatively used: R = alpha * (beta * rpm - U); R is the thrust, U is the speed through the water beta is related to pitch, and alpha is related to diameter and water density.
I've trying to work out the drag on my boat while driving it through the water.
Doubtless standard stuff for naval architects armed with 3D CAD programs and tank models like there are at the Wolfson unit in Southampton, but the data seems never to be released by boat builders or designers.
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My conclusion is that the undoubted effect of tide when at anchor is much more to do with the sheering, and thus dynamic forces it creates, than due to a simple increase in static load. The last thing I bothered plotting was the bollard pull I'd get, when motoring in reverse.Tags: Adult Dating, affair dating, sex dating