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YSD-11-class crane ship
Type of United States World War II ship / From Wikipedia, the free encyclopedia
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YSD-11 Class Seaplane Wrecking Derrick is a class of US Navy derrick crane ship. While listed to service seaplanes the crane was able to lift small boats and large engines also. Hull classification symbol YSD is for Yard Seaplane Dirrick, Yard as in ship repair yard. YSD-11s were used to remove broken seaplanes from the water for repair or regular maintenance. The US had 2,661 Consolidated PBY Catalina built for the war, Canada built 620. Other seaplanes built in mass production were the 1,366 Martin PBM Mariner, 749 Short Sunderland and 345 Grumman G-21 Goose. The YSD-11 Class Derrick was built to support naval operations during World War II, having a displacement of 220 tons no load and 270 tons loaded. The YSD-11 Class had a length of 104 feet; a beam of 31 feet and 2 inches; a draft of 4 feet. They had a top speed 10 knots, built with a steel hull. The ship had one American Hoist & Derrick model 685 rotating crane. The crane had a boom of 54 feet with a lifting capacity of 10 tons. The crane was powered by a 6-cylinder Cummins Diesel engine. The ship housed a crew of one Officer and 15 Enlisted men. The ships had a diving gear locker for the crew salvage work. For service power, the ship had two generators: one 30 kW Diesel engine to electric generator and one 20 kW Diesel Generator. Ship power was from two Superior model MRDB-8 200 HP Diesel engines with two propellers, 640shp. The YSD-11 Class Derricks were built by a number of United States shipyards, including Moore Equipment Company, Puget Sound Navy Yard, Charleston Navy Yard, Mare Island Naval Shipyard, Soule Steel Company, Pearl Harbor Navy Yard and Boston Navy Yard.[1][2][3][4][5]
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