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D-class blimp
The D class blimp was a patrol airship designed by the US Navy〔(Kite Balloons to Airships...the Navy's Lighter-than-Air Experience )〕 in the early 1920s. The D-type blimps were slightly larger than the C-type and had many detail improvements. The Navy continued the practice of dividing the envelop production between Goodyear and Goodrich. The control cars were manufactured by the Naval Aircraft Factory. The major improvements were a better control car design. The engines were moved to the rear to reduce noise and allow better communications between crew members. The fuel tanks were suspended from the sides of the envelope. The envelope was identical to the C-type, except an additional six foot panel was inserted for a total length of and a volume of . The last of the D-Class, D-6, had an different control car designed by Leroy Grumman who later founded the Grumman Aircraft Engineering Corporation.〔Shock, James R., U.S. Navy Airships 1915-1962, 2001, Atlantis Productions, Edgewater Florida, ISBN 0-9639743-8-6, page 30〕
==Operational history==
The D-1 burned the day of its first flight in the Goodyear hangar〔(The Goodyear Blimp: History of Wingfoot Lake Hangar )〕 at Wingfoot Lake, Ohio. The D-2,〔(U.S. Navy Goodrich Airship D-2 1920 )〕 D-3, D-4 and D-5 were transferred to the United States Army which the Air Ship Board had given the primary role of operating non-rigid airships after World War I.〔Shock, James R., U.S. Army Airships, 1908-1942, 2002, Atlantis Productions, Edgewater Florida, ISBN 0-9639743-9-4, page 44〕 D-3 participated as an observation and photography aircraft at the famed "Mitchell" bombing test of 1921. D-3 also participated in the Mitchell bombing trials, tested experimental mooring masts. D-3 also participated in early "hook-on" experiments to see if it was possible for an airplane to fly up to and hook onto a trapeze hanging from an airship. No actual hook-ons were achieved, but approaches were practiced. D-4 also participated in the Mitchell trials, and in observation jobs. The D-5 was never operated by the Army with that designation. After the loss of D-2, the D-5 was erected with more powerful 180 hp Wright V engines and flown as the D-2 (no. 2) D-2 (no 2 is a designation created by historian James Shock, never used by the Army).〔Shock, James R., U.S. Army 1908-1942, Airships 1908-1942, 2002, Atlantis Productions, Edgewater Florida, ISBN 0-9639743-9-4, page 44〕 There is no evidence the airship flew for the Army with the designation "D-5". D-5 is believed to have been renumbered "D-2" after the loss of that airship.〔Shock, James R., U.S. Army Airships, 2002, Atlantis Productions, Edgewater Florida, ISBN 0-9639743-9-4, page 45〕
The Navy retained one additional D-type, the D-6.〔(U.S. Navy Goodyear Airship D-6 1921 )〕 The D-6 was built by the Naval Aircraft Factory, Philadelphia, Pennsylvania, but her design was sufficiently different that she was distinct from the other five D-class airships. It featured a further improved control car (the "D-1 Enclosed Cabin Car" which had a water tight bottom for landings on water and internal fuel tanks. The D-6〔 was burned in the Naval Air Station Rockaway hangar fire〔(NY Times Sept. 1, 1921, Page 2, Biggest Navy Blimp Burns with 3 More )〕 of 31 August 1921 along with two small dirigibles, the C-10 and the H-1 and the kite balloon A-P.
The last operational D-type, the D-3 was apparently deflated by the Army in early 1924.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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