The XA-26F was a prototype for a high-speed version of the Invader.
A single A-26B-61-DL (44-34586) was modified as the XA-26F prototype. It was fitted with a pair of 2100
hp R-2800-83 engines initially driving three-bladed propellers but
later fitted with four-bladed units with large spinners. In addition,
a 1600 lb.s.t. General Electric J31 turbojet was installed in the
rear fuselage, with the exhaust pipe in the tail and fed by an intake
above the central portion of the fuselage in place of the usual dorsal
turret and gunner position. The eight-gun nose and the six wing 0.50-inch
machine guns were retained.
With all three engines running at full power, the aircraft achieved a
maximum speed of 435 mph at 15,000 feet. However, this was deemed to be an
insufficient performance improvement over the proposed A-26D to
warrant any production.
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Peter M. Bowers, Smithsonian Institution Press, 1989.
McDonnell Douglas Aircraft Since 1920: Volume I, Rene J. Francillon,
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American Combat Planes, Third Enlarged Edition, Ray Wagner,