"yes"@en . "Westinghouse Electric Corporation"@en . . "Electric"@en . . "Aircraft"@en . "25"^^ . . "never in service"@en . "Mark 21 torpedo"@en . . . "yes"@en . "Gyroscope"@en . "Mark 21 torpedo"@en . . "The Mark 21 torpedo, designated Mark 21 Mod 0 was a passive acoustic homing torpedo designed in 1943 by Westinghouse Electric Corporation. The Mark 21 successfully passed launching tests in 1943, however, due to difficulties encountered by Westinghouse, the project was abandoned after a few development models had been built."@en . "22.5"^^ . "approx. 2300 pounds"@en . . "yes"@en . . . . . . . "400"^^ . "161"^^ . . "The Mark 21 torpedo, designated Mark 21 Mod 0 was a passive acoustic homing torpedo designed in 1943 by Westinghouse Electric Corporation. The Mark 21 successfully passed launching tests in 1943, however, due to difficulties encountered by Westinghouse, the project was abandoned after a few development models had been built."@en . "Mark 8 contact exploder"@en . "1943"^^ .