I did not want to laugh at oby personally .
.sry oby.... I've only laughed at the fact that he "referred not historically exact ..... the first torpedo used in which cavitation was first built in 1977th
so that the topic should be done now but ...
I hope you can understand what I write .. I have to say what I want to write a translation program .. sry
"In the military field torpedoes are used, moving at high speed under water in an artificial cavity. This technology was first developed by the Russian navy to the application stage and the term is supercavitation known.
The speed of forming a super-cavitation in water is in the range of 180 km / h, depending on the pressure and the temperature of the water and the shape of the cavitator. First, a functioning system that uses the supercavitation, 1977, the torpedo Schkwal after ten years of development by the Navy of the Soviet Union was put into service. Its speed is specified with 350 to 500 km / hr. It is driven by a solid rocket motor.
One problem with the motion in a super-cavitation is the controllability, the early models of Schkwal were uncontrolled. There were, however, since different control concepts developed rotate, so current versions of the Schkwal probably around its longitudinal axis and are controlled by means of a hinged axis cavitator.
The German Navy has in common with the technology company Diehl BGT Defence is developing a new high-speed torpedo (Superkavitationstorpedo). The torpedo is specified by the manufacturer under water, not only over 400 km / h (about 216 knots), but still manageable."