OVERVIEW: The Hoot (Iranian for “Whale”) is a supercavitating, solid‑fuel rocket torpedo developed by Iran and first test‑fired in April 2006. It operates at ultra-high speeds (~360 km/h) against surface and subsurface targets.

DETAILS: The Hoot is widely regarded as a reverse-engineered copy of the Russian VA‑111 Shkval, adopting its supercavitation technology to travel at speeds exceeding 200 knots . Development is attributed to Iran’s IRGC Aerospace Industries Organization, with testing conducted during the “Great Prophet” naval drills in April 2006. The torpedo uses solid‑fuel rocket propulsion to create a gas bubble around its nose cone, drastically reducing drag and enabling extreme speed. It reportedly carries a high‑explosive warhead (~210 kg) with a range of approximately 9–10 km.

TYPE: Supercavitating heavyweight torpedo

FUNCTION: Launched from 533 mm standard torpedo tubes on surface ships or submarines, the Hoot achieves supercavitation via its rocket engine, then travels in a straight line at ultra-high speeds. It lacks steering flexibility and active guidance, relying on high velocity to reach its target before counter‑measures can be deployed .

NOTE:
IOC: First tested April 2–3, 2006 (Great Prophet exercises) 
Manufacturer: IRGC Aerospace Industries Organization (Iran)
Operators: Iran 

SOURCE:
Federation of American Scientists: Iran’s “Hoot” Torpedo Documented; AP via Taipei Times; Al Jazeera; VOA News; Hoot (torpille) – fr.wikipedia.org