The B-36G was the designation initially applied to a swept-wing,
jet-powered version of the B-36F. Two B-36Fs (49-2676 and 49-2684)
were ordered as B-36Gs, but the designation was changed to YB-60
before they were built.
Sources:
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United States Military Aircraft Since 1909, Gordon Sqanborough and Peter
M. Bowers, Smithsonian, 1989.
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Post-World War II Bombers, Marcelle Size Knaack, Office of Air Force
History, 1988.
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General Dynamics Aircraft and their Predecessors, John Wegg,
Naval Institute Press, 1990.
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American Combat Planes, Third Enlarged Edition, Ray Wagner, Doubleday,
1982.
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Convair B-36: A Comprehensive History of America's "Big Stick", Meyers K. Jacobsen, Schiffer Military History, 1997.