Propfan
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A propfan, also called a propjet, an open rotor engine, or an open fan engine, is an aircraft engine combining features of turbofans and turboprops. It uses advanced, curved propeller blades without a
Mockup of a prototype GE36 at the Musée aéronautique et spatial Safran
The GE36 on a McDonnell Douglas MD-80 demonstrator at the 1988 Farnborough Air Show. The gearless unducted fan engine had an overall diameter of 11.67 ft (3.56 m), with either eight or ten blades in front (depending on the particular configuration) and eight blades in back.
The Progress D-236 propfan engine on the Yak-42E-LL testbed aircraft at the Paris Air Show in 1991
Progress D27 Propfans fitted to a prototype Antonov An-70
Turboprop
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A turboprop is a gas-turbine engine that drives an aircraft propeller.
Propfan
…A propfan, also called a propjet, an open rotor engine, or an open fan engine, is an aircraft engine combining features of turbofans and turboprops. It uses advanced, curved propeller blades without a duct. Propfans first started prototype testing in the 1970s, aiming to combine the speed capability…
GE T64 turboprop, with the propeller on the left, the gearbox with accessories in the middle, and the gas generator (turbine) on the right
A Rolls-Royce RB.50 Trent on a test rig at Hucknall, in March 1945
The Kuznetsov NK-12 is the most powerful turboprop to enter service
A military transport aircraft, over 2,500 Lockheed C-130 Hercules have been built