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Propeller walk
This graph:
http://www.windows.ucar.edu/tour/lin....html&edu=high Shows the density of water as a function of depth. Water density changes from 1.025 gm/cm^3 to 1.026 gm/cm^3 in 250 feet. That's a change of 0.1% in 250 ft. Since that portion of the curve is linear, one can estimate that water density would change .0004% over the diameter (tip to tip) of a 12 inch propeller. So is a .0004% change in water density (in the vertical plane no less) going to walk a boat sideways? Don't think so. Now if the propeller shaft mounted off centerline reduces the walk, this would indicate that sideways (lateral) thrust from the propeller directed against the hull is a factor. Also with the shaft off center the boat is less likely to "torque" against the propeller. It's always good to find physical evidence to support a conjecture. |
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