what about the 1 where the torpedo forces out steam? from it's skin so that it effectively eliminates almost all of the skin drag! kind of like air hockey i guess

cut from the bbc webpage
"The new missile, called Hoot, or Whale, could be deployed on Iranian ships in the oil-rich area, which is home to the US 5th Fleet.

No warship can escape from this missile because of its high speed

It is said to travel at 360km/h (233mph), three to four times faster than most conventional torpedos."