Thread: Turbinia
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Old Apr 30, 2005, 05:37 PM
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The reason why Turbinia has so many propellers is to over come cavitation. Charles Parson decided to have three shafts and on each shaft, three propellers because he did not have as much power as he thought he would have when he tested Turbinia and he knew Turbinia was capable of greater speeds. As a propeller revolves, each blade develops lift in the manner of an airplane wing. When a blade revolves at high speed an area of low pressure develops on its back surface (usually toward the tip), much like the incipient stall of an aircraft wing. At excessive speed or loading, the low-pressure area may spread across the entire blade, forming tiny bubbles of water vapor and a consequent loss of thrust and onset of propeller vibration are experienced.
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