|The McDonnell XF-88B with a T38 turboprop in the nose|
|National origin||United States|
|Manufacturer||Allison Engine Company|
|Major applications||CV-240-21 Turboliner
|Developed into||Allison T56|
The Allison T38 (company Model 501) was an early large 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.
Design and development
Initially rated at 2,000 shp (1,491.40 kW) 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 shp (1,677.82 kW). Problems with gearbox vibration and combustion were dealt with during the test programme and were mirrored by problems in the Allison T40 programme. The engines fitted to the Convair CV-240-21 Turboliner were rated to 2,750shp.
Although the only 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.
A projected 9,000 shp (6,711.30 kW) development of the T38 which was cancelled before hardware had been produced.
A 4,100 shp (3,057.37 kW) turboprop derivative composed of two T38s driving a common gearbox.
- CV-240-21 Turboliner
- Convair T-29E (cancelled) 
- McDonnell XF-88B
- Piasecki YH-16A Transporter
- Type: Turboprop
- Dry weight:
- Maximum power output:
- Power-to-weight ratio:
- Related development
- Related lists
- Gunston, Bill (2006). The Development of Jet and Turbine Aero Engines, 4th Edition. Sparkford, Somerset, England, UK: Patrick Stephens, Haynes Publishing. ISBN 0-7509-4477-3.
- Leyes II, Richard A.; William A. Fleming (1999). The History of North American Small Gas Turbine Aircraft Engines. Washington, DC: Smithsonian Institution. ISBN 1-56347-332-1.
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