Abstract
A simplified mathematical model is formed for the flow field caused by the ventilating blade of a partially submerged propeller. The model is formed to investigate the difference between the phases of entry and exit; that is, a two-dimensional flat-sided wedge and a two-dimensional cambered wedge entering a free surface and exiting at another free surface, located at a distance equivalent to the length of circular path of blade section in the water. Pressure and drag are calculated for a flat plate and a parabolic cambered wedge, each at the instantaneous position, by a conformal mapping technique. A great difference in pressure distributions between the phases of entry and exit is obtained.
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