Packard Motor Company
The engine was designed by Navy Captain Lionel Melville Woolson, an aeronautical engineer at the Packard Motor Company of Detroit. The engine was an "X" configured design similar to one upright and one inverted V-12 engine mounted on the same crankshaft with a common crankcase. With 5.375 in (136.5 mm) bore and 5 in (130 mm) stroke, the resulting displacement was 2,775 cu in (45.47 l). The Packard X-2775 engineering involved in the design of the crankshaft, single piece crankcase and the master/slave rod system was very complex.
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