Airmen have long known that U.S.
engine builders had turned out aircraft power plants far more powerful than Wright Aeronautical Corp.'s 2200-h.p. Cyclone 18, the heftiest yet revealed. This week the U.S. Army Air Forces let one of its other builders reveal what one of the new and bigger engines is like.
General Motors' Allison division at Indianapolis announced that it was all ready to produce an engine in the 3,000-h.p. class. Unlike the air-cooled engine builders, who range their cylinders around a crankcase like the spokes of a wheel, Allison turns out...
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