NASA NTRS · 19870000495
Unducted-Fan Engine
Abstract
Unducted-fan (UDF(TM) engine advanced counterrotating-pusher-propeller propulsion system for high-subsonic (mach 0.7 to 0.85) aircraft. Combines modern high-pressure-ratio gas-turbine engine with multistage counterrotating power turbine directly coupled to counterrotating, advanced high-speed propellers. Key feature of system is unique direct turbine drive eliminating need for gearbox to transmit power to propeller blades.
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Meleason, Edward T., Johnson, K. O.. 1987-10-01. Unducted-Fan Engine. https://ntrs.nasa.gov/citations/19870000495
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