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The K-gun, standardized in 1942, replaced the Y-gun as the primary depth charge projector. The K-guns fired one depth charge at a time and could be mounted on the periphery of a ship's deck, thus freeing valuable centerline space. Four to eight K-guns were typically mounted per ship.
The standard armament for the class was two 5 in (127 mm) dual purpose guns, four 40 mm and ten 20 mm anti-aircraft guns, and three 21-inch (533 mm) torpedo tubes.It also carried two depth charge racks, eight K-gun depth charge projectors and one hedgehog projector as secondary weapons.
Until depth-finding sonar became available (the first was the Royal Navy's Q attachment in 1943), there was a "dead period" during the final moments before a depth-charge attack began when contact with the target would be lost. U-boat commanders became adept at sharp course changes and direction speed at these moments to break contact and escape.
8 × K-gun depth charge projectors 2 × depth charge tracks USS Solar (DE-221) (pronounced sō-lär), a Buckley -class destroyer escort of the United States Navy , was named in honor of Boatswain's Mate First Class Adolfo Solar (1900–1941), who was killed in action during the Japanese attack on Pearl Harbor on 7 December 1941.
1 × depth charge projector (Hedgehog type) USS Thomas J. Gary (DE-326) was an Edsall -class destroyer escort . The ship was renamed Thomas J. Gary on 1 January 1945 to free the name for planned light cruiser USS Gary (CL-147) .
USS Henry R. Kenyon (DE-683) was a Buckley-class destroyer escort in service with the United States Navy from 1943 to 1947. She was sold for scrap in 1970. The ship was named in honor of Ensign Henry R. Kenyon, Jr. (1916–1942), a naval aviator in squadron VT-8, who was killed in action in the Battle of Midway.
During the ensuing period of conversion, the Coast Guard vessel was reconfigured as a patrol cutter. She now sported a main battery of a single-mount 5-inch gun, a hedgehog, a twin 40-millimeter mount, and two 20-millimeter guns, in addition to depth charge tracks and projectors and was reclassified once again as WPG-37.
Gun mount control panel (GMCP) – Backup interface for the GCC. Velocimeter – A Doppler radar system directly above or next to the gun barrel that measures each fired projectile's initial velocity (IV). The GMP uses the IV data for ballistic solution corrections. Velocimeter of 5"/54 caliber Mk 45 gun aboard USS The Sullivans ADSU of Mk 46 ...