[{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","@id":"https:\/\/wiki.edu.vn\/en\/wiki41\/allison-t38-wikipedia\/#BlogPosting","mainEntityOfPage":"https:\/\/wiki.edu.vn\/en\/wiki41\/allison-t38-wikipedia\/","headline":"Allison T38 – Wikipedia","name":"Allison T38 – Wikipedia","description":"From Wikipedia, the free encyclopedia The Allison T38 (company Model 501) was an early turboprop engine developed by Allison Engine","datePublished":"2020-12-13","dateModified":"2020-12-13","author":{"@type":"Person","@id":"https:\/\/wiki.edu.vn\/en\/wiki41\/author\/lordneo\/#Person","name":"lordneo","url":"https:\/\/wiki.edu.vn\/en\/wiki41\/author\/lordneo\/","image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/c9645c498c9701c88b89b8537773dd7c?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/c9645c498c9701c88b89b8537773dd7c?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"Enzyklop\u00e4die","logo":{"@type":"ImageObject","@id":"https:\/\/wiki.edu.vn\/wiki4\/wp-content\/uploads\/2023\/08\/download.jpg","url":"https:\/\/wiki.edu.vn\/wiki4\/wp-content\/uploads\/2023\/08\/download.jpg","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/en.wikipedia.org\/wiki\/Special:CentralAutoLogin\/start?type=1x1","url":"https:\/\/en.wikipedia.org\/wiki\/Special:CentralAutoLogin\/start?type=1x1","height":"1","width":"1"},"url":"https:\/\/wiki.edu.vn\/en\/wiki41\/allison-t38-wikipedia\/","wordCount":2427,"articleBody":"From Wikipedia, the free encyclopediaThe Allison T38 (company Model 501) was an early turboprop engine developed by Allison Engine Company during the late 1940s. The T38 became the basis for the very successful family of Allison T56 turboprop engine.[1]Design and development[edit]Developed as a stand-alone single section of the T40 (Model 500) twin engine to aid in development of the T40, the T38 started life with a 19-stage axial compressor, eight can type combustion chambers, a 4-stage turbine driving the compressor and the extension shaft to the reduction gearbox.[2]Initially rated at 2,000\u00a0shp (1,500\u00a0kW) the T38 first ran in 1947 and flew in the nose of a Boeing B-17 Flying Fortress test-bed on 19 April 1949, rated at 2,250\u00a0shp (1,680\u00a0kW). Problems with gearbox vibration and combustion were dealt with during the test program and were mirrored by problems in the Allison T40 programme. The engines fitted to the Convair CV-240-21 Turboliner were rated to 2,750\u00a0shp (2,050\u00a0kW) equivalent.[2]In 1951, the United States Air Force decided that the production version of the Beechcraft XT-36 trainer\u2014then in the mockup stage and designed for the Pratt & Whitney R-2800\u2014would be retrofitted with the T38 when the engine entered full-scale production, which was anticipated to occur in 1955\u20131960. This decision ultimately doomed the aircraft, as the design changes required to accommodate the T38 delayed the project and rendered the aircraft overweight and over budget.[3]Although the only other aircraft slated to receive the T38 as a production engine, the Convair T-29E, was cancelled, the T38 did power a converted Convair CV-240 (the CV-240-21 Turboliner, a project that would be abandoned due to engine problems), and was fitted in the nose of the McDonnell XF-88B to drive experimental supersonic propellers. Further development of the T38 provided the power sections for the Allison T40 as well as forming the basis for the Allison T56\/Model 501 and the projected Allison T39.[2]Variants[edit]Model 501-B7commercial version of the T38-A-6[4]XT38prototypes of the engine, single engine section of the T40, to assist in the development of the T40.[5]XT38-A-2[6]XT38-A-5Turboprop fitted to the McDonnell XF-88B.T38-A-6Military version of 501-B7[4]T38-A-101,800\u00a0shp (1,300\u00a0kW) turboshaft version for the Piasecki YH-16A TransporterT39(Model 504) A projected 9,000\u00a0shp (6,711.30\u00a0kW) development of the T38 which was cancelled before hardware had been produced.[7][2]T40(Model 500)  The 4,100\u00a0shp (3,057.37\u00a0kW) turboprop origin of the T38,[5] composed of two power sections driving a common gearbox.[2][8]T44(Model 503) large turboprop with three T38 engine sections.T56(Model 502) enlarged and improved version of the T38, destined to enter service by the tens of thousands.Applications[edit]Specifications (T38-A-6 \/ 501-B7)[edit]Data from Aircraft engines of the World 1953[4]General characteristicsType: Turboprop \/ TurboshaftLength: 84\u00a0in (2,100\u00a0mm) engine section onlyDiameter: 28.1\u00a0in (710\u00a0mm) (gearbox diameter); 20\u00a0in (510\u00a0mm) engine section diameterDry weight: 1,225\u00a0lb (556\u00a0kg) with extension shaft and gearboxComponentsCompressor: 17-stage axialCombustors: 8 tubular inter-connected stainless steel combustion chambersTurbine: 4-stage axial discs of Timken 16-25-4 alloy with special alloy bladesFuel type: MIL-F-5572 100\/130 Octane GasolineOil system: Dry sump, gear pump at 65\u00a0psi (4.5\u00a0bar) with scavenge pump; MIL-O-6081APerformanceSee also[edit]Related developmentRelated listsReferences[edit]^ Gunston, Bill (2006). The Development of Jet and Turbine Aero Engines, 4th Edition. Sparkford, Somerset, England, UK: Patrick Stephens, Haynes Publishing. pp.\u00a0204\u2013205. ISBN\u00a00-7509-4477-3.^ a b c d e f g h Kay, Anthony L. (2007). Turbojet History and Development 1930-1960 vol.2 (1st\u00a0ed.). Ramsbury: The Crowood Press. pp.\u00a0119\u2013121. ISBN\u00a0978-1-86126-939-3.^ a b Report on Review of Contracts for T-36A Trainer Aircraft (PDF) (Report). General Accounting Office. 18 October 1955. pp.\u00a010\u201313. B-118676. Retrieved 28 July 2021.^ a b c Wilkinson, Paul H. (1953). Aircraft engines of the World 1953 (11th\u00a0ed.). London: Sir Isaac Pitman & Sons Ltd. pp.\u00a066\u201367.^ a b c Nolan, D. J. (8 August 1952). “TURBO-LINER\u00a0: Development of the Allison T-38 Engine in a Convair 240” (pdf). Flight. LXII (2272): 157\u2013159. Retrieved 5 January 2019.^ Wilkinson, Paul H. (1950). Aircraft engines of the World 1950 (11th\u00a0ed.). London: Sir Isaac Pitman & Sons Ltd. pp.\u00a050\u201351.^ “Designations Of U.S. Military Aero Engines: 3 Jet and Turbine Engines, 1946 – 1968”. www.designation-systems.net. Retrieved 5 January 2019.^ Wilkinson, Paul H. (1953). Aircraft engines of the World 1953 (11th\u00a0ed.). London: Sir Isaac Pitman & Sons Ltd. pp.\u00a068\u201369.Further reading[edit]Leyes II, Richard A.; William A. Fleming (1999). The History of North American Small Gas Turbine Aircraft Engines. Washington, DC: Smithsonian Institution. ISBN\u00a01-56347-332-1."},{"@context":"http:\/\/schema.org\/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"https:\/\/wiki.edu.vn\/en\/wiki41\/#breadcrumbitem","name":"Enzyklop\u00e4die"}},{"@type":"ListItem","position":2,"item":{"@id":"https:\/\/wiki.edu.vn\/en\/wiki41\/allison-t38-wikipedia\/#breadcrumbitem","name":"Allison T38 – Wikipedia"}}]}]