1. Cavitation generated on entry side 2. Suction side covered with cavitation 3. Cavitation implants behind the screw blade 4. Direction of rotation 5. Sailing direction 6. Waterstroming
A supercavitating screw is a screw for high-speed vessels, which delivers conscious supercavitation. Conventional subcavitating screws are designed to work underwater and without cavitation. However, as soon as the rotational speed increases, cavitation increases, resulting in possible damage. This can be solved by a larger screw diameter and thus lower rotational speed, or more screwdrivers. However, this is often unavailable for high speed ships and the increased leaf surface also reduces efficiency. At high speeds, a large diameter also causes too much resistance.
A solution is the design of screws that intentionally generate cavitation, with the vapor bubbles projecting beyond the exit side at such a distance that they do not cause damage. This reduces efficiency.
Although V.L. Posdunine introduced the principle of supercavitating screws in 1943, especially Marshall P. Tulin began in the 1950s to come up with a theory that was useful in the design process.
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