A copy of the company brochure for the proposed MD-91 UDF (Unducted Fan) aircraft.
“McDonnell Douglas tried to carry on with prop-fan development. It had the rear-engine MD-80, but it was losing ground to the A320 and 737. MDC fitted a UDF engine to an MD-80 in late 1987 and wanted to launch the UDF-powered MD-91 and -92 by July 1988. The company even saw a 300-aircraft market for a Navy patrol version of the MD-91. But GE wanted to see 100 to 150 airline orders before committing to the program.” From here.
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