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Between 1908 and 1937 the U.S. Army had a program to operate airships. With the exceptions of the semi-rigid ''Roma'' and the Goodyear RS-1, they were non-rigid blimps. These airships were intended to perform search and patrol operations in support of coastal fortifications and border patrol. During the 1920s, the Army operated many more blimps than the U.S. Navy. ==History== The history of American military aviation began during the Civil War, when the Union Army operated observation balloons.〔Hoeling, Mary. ''Thaddeus Lowe America's One-Man Air Corps'', New York. Julian Messner, Inc., 1937, p. 110〕 Later, a balloon was used by the US Army in Cuba during the Spanish–American War. These were ad-hoc and not part of an established branch of the Army. The use of observation balloons continued after the end of World War I. The last use of observation balloons by the Army was during maneuvers conducted in Louisiana during September 1941.〔Shock, James R., U.S. Army Airships, 1908-1942, 2002, Atlantis Productions, Edgewater Florida, ISBN 0-9639743-9-4, page 168〕 Balloons must either be tethered, or go where they are blown by the wind, but towards the end of the nineteenth century powered airships, capable of being directed at the will of the pilot, were developed. In 1908 the US Army experimented with its first powered aircraft, the SC-1, or Signal Corps number 1.〔Jane, Fred T. ''Jane's All the World's Airships 1909'', Reprinted New York. Arco Publishing Company, Inc, 1969, p. 305. Library of Congress No. 69-14964〕 It was a small non-rigid airship with a top speed under 20 mph and an endurance of just over 2 hours. Following tests at Fort Myer, the SC-1 was sent to Fort Omaha, Nebraska, where the Signal Corps School was located. While the SC-1 was being tested at Fort Myer, the Signal Corps had built an airship hangar and a plant to produce hydrogen gas at Fort Omaha. Fort Omaha became, for a while, the first permanent military airfield in the United States. The SC-1 was scrapped in 1912, and the base at Fort Omaha closed in 1913.〔Shock, James R. ''US Army Airships 1908-1942'', Edgewater Florida. Atlantis Productions, 2002, p. 20. ISBN 0-9639743-9-4〕 The US Army operated French observation balloons during World War I, but did not operate another airship until after the war ended. During World War I the Joint Airship Board assigned the US Navy the role of acquiring and developing rigid airships. This did not dissuade the Army from pursuing its own course. Colonel William Hensley flew as an observer on the return voyage of the British R34 airship from Long Island, New York to the UK in the summer of 1919. Hensley was then sent on a confidential mission to contact the Zeppelin Company to attempt to purchase the remaining undelivered wartime Zeppelin, the L 72. The scheme probably originated with General "Billy" Mitchell.〔Robinson 1973, p.186〕 Hensley visited the Zeppelin plant, inspected L 72 and flew on the ''Bodensee'', a small passenger Zeppelin. The Inter-Allied Commission of Control ordered that L 72 should be turned over to France. In November 1919 the US Army contracted with the Zeppelin corporation for construction of the LZ 125, which was to be larger than the R38 class airship which the USN had contracted to purchase from Britain as the ZR-2. This attempt to avoid the conditions set by the Joint Airship Board would have encountered legal problems as the US Senate refused to ratify the Allied Peace Treaty with Germany until October 1921.〔Schock, James R. ''US Army Airships 1908-1942'', Edgewater Florida. Atlantis Productions, 2002, p. 22. ISBN 0-9639743-9-4〕 Complaints by the Secretary of the Navy resulted in the Secretary of War ordering the German contract terminated in December 1919.〔Robinson, Douglas H. ''Giants in the Sky, A History of the Rigid Airship'', Seattle, Washington. University of Washington Press, 1973, p. 188. ISBN 978-0854291458〕〔Meyer, Henry Cord, ''Airshipmen Businessmen and Politics 1890-1940'', Washington and London. Smithsonian Institution Press, 1991, p. 124. ISBN 1-56098-031-1〕 Following the end of World War I, the U.S. Army acquired a variety of blimps from US, French and British sources. Plans were made for operating airships from both Fort Bliss and Brooks Field, in Texas〔Bilstein, Roger and Miller, Jay. ''Aviation in Texas'', Austin, Texas. Texas Monthly Press, Inc., 1985, p. 54. ISBN 978-0932012951〕 and Langley Field, Virginia. The first blimp operated by the Army was the A-4, which was operated primarily from Langley until transferred to the new Balloon and Airship School at Fort Scott, Illinois. The Army operated several Navy C class blimps and D class blimps during the immediate post-WWI era.〔Shock, James R. ''US Army Airships 1908-1942'', Edgewater Florida. Atlantis Productions, 2002, p. 38. ISBN 0-9639743-9-4〕 Army blimps participated in the "Mitchell" bombing test in 1921. They were used for training, coastal patrol, and experimentation in the early 1920s. The Army purchased three British SST class blimps from the British, which were operated out of Biggs Field, Fort Bliss, and Brooks Field, both in Texas for purposes of border patrol between 1920 and 1923.〔Shock, James R. ''US Army Airships 1908-1942'', Edgewater Florida. Atlantis Productions, 2002, pgs. 38. ISBN 0-9639743-9-4〕 During the 1920s the Army developed several "Motorized Observation Balloons". The OB-1 and MB were intended to fly to where needed, and then be tethered as observation balloons.〔Shock, James R. ''US Army Airships 1908-1942'', Edgewater Florida. Atlantis Productions, 2002, pgs. 59-62. ISBN 0-9639743-9-4〕〔("Use Motor To Fly Army Balloon" ) ''Popular Science'', January 1937, article middle of page 45〕 The US Army acquired the Italian semi-rigid airship ''Roma'' in 1921. The ''Roma'' was the largest airship operated by the Army. It was based at Langley Field. With a cruising speed of 50 mph and a range of 7,000 miles, the ''Roma'' allowed the Army to consider transcontinental deployments, missions to Panama, the fast transport of cargo and passengers, discovering threatening fleets far out at sea. The ''Roma'' was destroyed by fire in an accident near Norfolk, Virginia on 21 February 1922. The Roma tragedy led Congress to decree that all US airship operations would in the future use helium instead of hydrogen as the lifting gas.〔Shock, James R. ''US Army Airships 1908-1942'', Edgewater Florida. Atlantis Productions, 2002, p. 71. ISBN 0-9639743-9-4〕〔Allen, Hugh. ''The Story of the Airship (non-rigid)'', Privately Printed, Akron, Ohio and Chicago, by the Lakeside Press, R.R. Donnelley & Sons Company, 1943, p. 63〕 During the 1920s and 30s the US Army Airship Service was responsible for improvements in airship operation construction. These included the use of internal gondola suspension〔Shock, James R. ''US Army Airships 1908-1942'', Edgewater Florida. Atlantis Productions, 2002, p. 63. ISBN 0-9639743-9-4〕 and the only advanced semi-rigid airship built in America, the RS-1.〔Shock, James R. ''US Army Airships 1908-1942'', Edgewater Florida. Atlantis Productions, 2002, p. 73. ISBN 0-9639743-9-4〕 The army operated the RS-1 during the late 1920s until the requirement for a new envelope grounded the ship and resulted in it being scrapped.〔Shock, James R. ''US Army Airships 1908-1942'', Edgewater Florida. Atlantis Productions, 2002, p. 79 ISBN 0-9639743-9-4〕 The Airship Service also supplied airship pilots and logistic support for stratospheric research flights.〔DeVorkin, David H. ''Race to the Stratosphere'', New York, Berlin, Heidelberg, London and Paris. Springer-Verlag, , 2989, p. 142. ISBN 0-387-96953-5〕 The majority of the airships operated by the US Army during the 1920s and 30s were of the "TC" Class, designed for coastal patrol duty,〔Shock, James R. ''US Army Airships 1908-1942'', Edgewater Florida. Atlantis Productions, 2002, p. 93. ISBN 0-9639743-9-4〕 because the US Army had long held the primary responsibility for coastal and harbor defense of the USA.〔Kaufmannm J. E. and Kaufmann H. W. ''Fortress America the forts that defended America 1600 to he Present'', Cambridge, Massachusetts, Da Capo Press, 2004, p. 142. ISBN 0-9639743-9-4〕 The airship was seen as capable of searching for hostile ships and tracking those ships until they could be engaged by coastal defenses or Army bombers.〔 One TC class blimp, the C-41, was used for various public relation experiments in the 1930s, including landing on the Washington D.C. mall to lay a wreath at the Lincoln Memorial〔("Airmen Honor Lincoln" )〕 and experimenting with picking up mail from a moving train.〔("Dirigible Grabs Mail Bag from Speeding Train" ''Popular Mechanics'', August 1930 )〕 Amongst the most interesting U.S. Army Airship Service experiments was to pursue the ability to operate airplanes from airships. While both the Germans and British had experimented with releasing fighters from rigid airships, it was the US Army which first flew an airplane from the ground and 'hooked' on to a trapeze suspended from an airship. Many tests involving a Sperry Messenger airplane and TC-3, a TC class blimp, were made in the mid-1920s. Eventually the technology was assumed by the US Navy on the "flying aircraft carriers", USS Akron (ZRS-4) and USS Macon (ZRS-5).〔Smith, Richard K. ''The Airships Akron and Macon'', Annapolis, maryland. United States Naval Institute Press, 1965, p. 22. Library of Congress Card No. 65-21778〕 The US Army continued to show interest in the acquisition and operation of rigid airships well into the 1930s.〔Smith, Richard K. ''The Airships Akron and Macon'', Annapolis, Maryland. United States Naval Institute Press, 1965, p. 13. Library of Congress Card No. 65-21778〕〔Shock, James R. ''US Army Airships 1908-1942'', Edgewater Florida. Atlantis Productions, 2002, p. 31. ISBN 0-9639743-9-4〕 The Army Airship Service developed new designs, and operated a number of blimps, primarily from Scott Field and Langley Field though the early 1930s when competition for funding from the rapidly growing Air Corps started its decline. In 1932 the Army contracted for two blimps significantly more capable than any in service, these were the TC-13 and TC-14. When Army Airship operations were terminated in 1937 a number of Army blimps were conveyed to the USN. Only TC-13 and 14 were operated by the Navy.〔Shock, James R. ''US Army Airships 1908-1942'', Edgewater Florida. Atlantis Productions, 2002, p. 162. ISBN 0-9639743-9-4〕 The Army had failed during the post-World War I era to establish a definite mission, much less a doctrine for accomplishing that mission, for its airships. By 1935 Congress was trying to eliminate funding for the Army airships, and Chief of the Air Corps Major General Benjamin Foulois, who himself had been a pilot of the SC-1, was recommending the program be terminated. In mid-1937 the Army had finished operating airships. As Congress refused to authorize expenditures for Army airships but did allow funding of observation balloons the army resurrected the "Motorized Observation Balloon" concept abandoned a decade before.〔Shock, James R. ''US Army Airships 1908-1942'', Edgewater Florida. Atlantis Productions, 2002, pgs 153-158. ISBN 0-9639743-9-4〕 The "Motorized Observation Balloon" continued in use for several more years.〔(''Flight'', 21 April 1938 )〕 There were even new 'pony blimps' constructed.〔("Picture of commercial Pony Blimp." ) ''Popular Monthly Science'', March 1930, p. 64, picture mid-page.〕 These were the five C-6, seven C-8 and four C-9 class airships.〔Shock, James R. ''US Army Airships 1908-1942'', Edgewater Florida. Atlantis Productions, 2002, p. 153, 154. ISBN 0-9639743-9-4〕 Two of the TE-3 class were re-designated C-7s. The last US Army airships were the two C-7s which were turned over to the USN in 1943.〔Shock, James R. ''US Army Airships 1908-1942'', Edgewater Florida. Atlantis Productions, 2002, p. 160. ISBN 0-9639743-9-4〕 Following World War II, the War Assets Administration put up for sale sixteen Motorized Observation Balloons of the C-6, 8 & 9 classes. One was briefly operated by the Douglas Leigh Sky Advertising Company between 1948 and 1950, the C-6-36-11 made its last flight on 14 June 1950.〔Shock, James R. ''US Army Airships 1908-1942'', Edgewater Florida. Atlantis Productions, 2002, p. 168. ISBN 0-9639743-9-4〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「U.S. Army airships」の詳細全文を読む スポンサード リンク
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