Design and Development of the 81 mm Mortar Cartridge Signal, Underwater Sound (MCSUS), XN-1.
NAVAL WEAPONS STATION YORKTOWN VA
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This report describes a mortar fired, underwater ordnance item, the 81 mm Mortar Cartridge Signal, Underwater Sound MCSUS, XN-1. The signal consists of a hydroadiabatic fuze adapted to an inert loaded, 81 mm Mortar Cartridge, M374. This fuze has no moving parts and incorporates a new type of firing train that does not contain primary explosive. The signal is propelled from a ship-mounted Mortar, Mk 2 Mod 0, to enter the water at selectable horizontal ranges up to 4932 yards 4500 meters. It then rapidly descends to a depth of 1000 feet 305 meters and detonates a 1-ounce 28-gram explosive charge. The acoustic output is used to measure deviations from linearity of long, ship-towed hydrophone arrays. Author
- Ammunition and Explosives