Defense Tech has a great post up on the Iranian ‘Hoot‘ supercavitating torpedo and its roots in the Russian ‘Shkval’. The ‘Hoot’ is apparently capable of speeds greater than 200 miles per hour. The Iranians have a number of missile boats, the primary force in its small surface fleet. These would probably be quickly destroyed in a conflict with the US Navy, but more troubling would be submarines. The ‘Shkval’ can be fired from submarine’s torpedo tube, though I’m not sure about the Iranian ‘Hoot’. The video released by Iran shows it being fired from a surface vessel.
The Iranians purchased three Kilo-class diesel-electric boats in the mid-90s and the Russians have upgraded them at various points. Pic of one on its way to Iran in the extended entry.
Russian-built, Kilo-class diesel submarine recently purchased by Iran, is towed by a support vessel in this photograph taken in the central Mediterranean Sea during the week of December 23. The submarine and the support ship arrived at Port Said, Egypt, on Tuesday and were expected to begin transiting the Suez Canal today, Jan. 2, 1996. Ships and aircraft from the U.S. Navy’s Sixth Fleet are tracking the submarine, which has been making the transit on the surface. This is the third Kilo-class submarine the Iranians have purchased from Moscow. DoD photo.
Note the towing lines. Pic from the DoD’s January 1997 archive.
UPDATE: See Strategy Page’s Iran’s High Speed Torpedo Scam