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The Boeing YC-14 was an experimental cargo transport. It was equipped with the most efficient powered lift system to enable STOL ever developed in an aircraft.
The YC-14 was produced in response to the United States Air Force requirements for an Advanced Medium Short Take-off and Landing Transport (AMST) that would be jet powered. Two were built.
The transports were designed to use existing engines and incorporate a "Coanda Effect" (the maximization of pressure on a curved surface symetrically bulging outward). The end results was an aircraft that would be able to lift large amounts of weight in relatively short distances while taking off and landing.
Although the Boeing YC-14 test aircraft performed beyond expectations, lack of funding ended the project.
Boeing YC-14 from front.
Boeing YC-14 from side.
Boeing YC-14 from rear.