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A propfan, also called an open rotor engine, open fan engine [1] [2] or unducted fan (as opposed to a ducted fan), is a type of aircraft engine related in concept to both the turboprop and turbofan, but distinct from both. The design is intended to offer the speed and performance of a turbofan, with the fuel economy of a turboprop.
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The fan is driven by a long V-belt from the back of the engine with an adjustable idler pulley. The belt makes two 90° turns to reach the fan resulting in four 90° twists. An early problem with the fan drive-belt jumping off the pulleys was solved by making the groove in the idler pulley deeper and adding belt guides.
This arrangement introduces an additional gas leakage path compared to a front-fan configuration and was a problem with this engine with higher-pressure turbine gas leaking into the fan airflow. [47] An aft-fan configuration was later used for the General Electric GE36 UDF (propfan) demonstrator of the early 1980s.
Lynch is a lifelong genre film fan (especially horror) and has appeared as a featured guest at several Weekend of Horrors conventions. [5] He has also appeared in several short films, including director Adam Green 's 2007 Halloween short "The Tiffany Problem" alongside Joel Moore and Corri English . [ 6 ]
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In a geared turbofan, a planetary reduction gearbox between the fan and the LP shaft allows the latter to run at a higher rotational speed thus enabling fewer stages to be used in both the LP turbine and the LP compressor, increasing efficiency and reducing weight. However, some energy will be lost as heat in the gear mechanism and weight saved ...