Mousetrap (ASW Marks 20 and 22) was an anti-submarine rocket used mainly during the Second World War by the U.S. Navy and the U.S. Coast Guard. Its development was begun in 1941 as a replacement for Hedgehog, a British-made projector, which was the first ahead-throwing ASW weapon. These, however, were spigot-launched, placing considerable strain on the launching vessel's deck, whereas Mousetrap was rocket-propelled. As a result, Mousetrap's four or eight rails for 7.2-inch (183 mm) rockets saved weight and were easier to install.
- Round weight: 65 lb (29 kg)
- Warhead: 33 lb (15 kg)
- Range: about 280m
- Firing speed: one round every 3 seconds (maximum)
- No. of rails:
- Mark 20: 4
- Mark 22: 8
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- Fitzsimons, Bernard, ed. "Mousetrap", in Encyclopedia of Twentieth Century Weapons and Warfare, Volume 18, pp1946-7. London: Phoebus Publishing, 1978.