EFFECT OF ENTRAINED WATER ON THE MASS MOMENT OF INERTIA OF SHIP PROPELLERS
DAVID TAYLOR MODEL BASIN WASHINGTON DC
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Several series of model propellers varying in pitch and in blade width were set in torsional vibration on vertical shafts. The resonant frequency was measured with the propeller in air and in water. A value was assigned to the increase in moment of inertia in water on the assumption that the change in resonant frequency was due wholly to this cause. The effect was found to increase with pitch and with blade width and also to be dependent on both amplitude and frequency in water. From the data obtained no simple mathematical expression could be found which would be universally applicable. With the apparatus in its present state it is not possible to study the effects of amplitude and frequency separately.
- Fluid Mechanics
- Marine Engineering