Douglas A2D Skyshark
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The Douglas A2D Skyshark is an American turboprop-powered attack aircraft built by the Douglas Aircraft Company for the United States Navy. The program was substantially delayed by engine reliability
A production A2D-1 in flight
Douglas A2D-1 Skyshark BuNo. 125485 (seventh of 10 pre-production aircraft) at Idaho Falls Regional Airport
The sole surviving A2D-1 Skyshark on display in 2014
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.
Douglas A2D Skyshark
…of jet power. While it resembled the AD Skyraider, the A2D was different in a number of unseen ways. The 5,100-equivalent shaft horsepower (3,800 kW) Allison XT40-A2 engine had more than double the horsepower of the Skyraider's R-3350. The XT40 installation on the Skyshark used contra-rotating propellers to harness…
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.