"Keith Willshaw" wrote in message
...
Supercavitation requires a large gas generating capacity
and humongous amount of thrust. To achieve this the
Shkval has a honking great solid fuel rocket that takes
up most of its interior space and has a range of less than
6 miles.

Yes, I see your point. You're absolutely right. It is quite impractical (or,
better, impossible) with today's technology, but it might prove to be an
interesting concept in future.