The Huff-Daland XHB-3 was a projected monoplane heavy bomber of the mid
1920s that was to be powered by a pair of 787 hp Packard 2A-2540
twelve-cylinder liquid-cooled Vee engines. The project was cancelled
before anything could be built.
Sources:
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United States Military Aircraft Since 1909, Gordon Swanborough and
Peter M. Bowers, Smithsonian, 1989.
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American Combat Planes, Ray Wagner, Third Edition, Doubleday, 1982.
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American Warplanes, Bill Gunston
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Jane's Encyclopedia of Aviation
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U.S. Army Aircraft, 1908-1946, James C. Fahey