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    Grable |Upshot-Knothole|

    / Main Archive / USA /



    Page: 5/7



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    Date: 15:30 UTC 25/05/1953 | Type: Airburst @159m | Yield: 15 Kt

    The Grable shot was an artillery delivered airburst. The test name was mnemonic code for "Gun". The shell travelled 10,000 meters before detonation 26m west, 41m south, and 7m above the designated burst point. The 280 mm shell used a "gun-type" fission weapon assembly method like the Little Boy bomb. The Mk-9 280 mm shell was 130cm long, weighed 365 kilos, and used oralloy as the fissile material. Air burst detonation was arranged by a time fuse. The Mk-9 device was fired by an enormous 85 ton artillery piece which had a muzzle velocity of 629m/sec, and a range of up to 32 kilometers.

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