Progress D-27
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The Progress D-27 is a propfan engine that the U.S.S.R company developed in the 1980's for commercial and military transport aircraft. Unlike the General Electric GE-36 UDF propfan, the D-27 has a fairly conventional layout, with a reduction gearbox linking the power turbine to the contra-rotating propfan blades, which are located at the front of the engine (i.e. tractor configuration). Early work stalled because aviation fuel became cheap in real terms and of concerns about excessive cabin noise.
However, latest reports indicate that the D-27 may actually go into quantity production for the Antonov An-70 military transport.
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