Allison T40
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The Allison T40, company designation Allison Model 500, was an early American turboprop engine composed of two Allison T38 power sections driving a contra-rotating propeller via a common gearbox.
T40-A-10 at the National Museum of the United States Air Force
T40 engines on the XP5Y-1 prototype in 1950
The engine cowlings on this Hiller X-18 have not been fully installed, so the dual turbine units are visible.
A T40 of a Convair XP5Y-1.
Convair R3Y Tradewind
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The Convair R3Y Tradewind was an American 1950s turboprop-powered flying boat designed and built by Convair.
Allison T40
…be shut down by destroying the compressor with debris thrown down the intake, proving the de-coupling system. First flight test of the T40 was in the Convair XP5Y flying boat on 18 April 1950 fitted with four T40-A-4 developing 5,250 shp (3,915 kW). Service use of the T40 revealed problems with integrity of the…
An R3Y-1 Tradewind low over San Francisco Bay near NAS Alameda
The Convair XP5Y-1 prototype in 1950. It first flew on 18 April 1950 at San Diego and crashed in 1953.
R3Y-2 variant loading a tractor
R3Y-2 Tradewind refuels a record four fighters in flight, 1956