Home Technology Prop powered Boeing 727, The 7J7 With An Unducted Fan

Prop powered Boeing 727, The 7J7 With An Unducted Fan

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Prop powered 727 from August 20, 1984. It was called the 7J7 with an unducted fan. Boeing dropped the idea.The Boeing 7J7 was a short- to medium-range airliner proposed by American aircraft manufacturer Boeing in the 1980s.

source/image(PrtSc): JetFlix

It would have carried 150 passengers and was touted as the successor to the successful Boeing 727. This was intended as a highly fuel-efficient aircraft employing new technologies, but it was postponed indefinitely as the price of oil dropped during the 1980s.

It was powered by Two General Electric GE36 UDF rear-mounted advanced technology contra-rotating unducted fan (propfan) engines.The General Electric GE36 was an experimental aircraft engine, a hybrid between a turbofan and a turboprop.

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Although the engine demonstrated an extremely low specific fuel consumption, cabin noise levels were a problem, even though the engines were mounted at the rear of the test aircraft.However, the noise was not considered an insurmountable problem./wikipedia