Allison T40

Allison T40, sebutan perusahaan Allison Model 500, adalah mesin turboprop Amerika awal terdiri dari dua Allison T38 bagian power daya mengemudi baling-baling kontra-berputar melalui gearbox.

Maximum power output: 4,000 shp

• Douglas A2D Skyshark
• North American A2J Super Savage
• Convair P5Y
• Convair R3Y Tradewind
• Hiller X-18
• Lockheed XFV
• Convair XFY
• Republic XF-84H Thunderscreech

• 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. 

Wikimedia Commons memiliki media mengenai Allison T40.

• Flight 1950 article
• Dual Turbine Produces 5,500 h.p. early article with good illustration showing how two engines are connected to one gear box
• "American Turboprops" a 1950 Flight article
• "Tradewind Turboprops" a 1955 Flight article