Transport: Powerful Secret

Alongside the Indianapolis motor speedway is the most secretive aircraft engine plant in the U. S., the Allison Engineering Co. factory, wholly owned by General Motors. There the sleek 1,200-h.p. motors that power the Army's fastest ships are built. Because the Air Corps takes the entire output of the plant, uses them to power speedy Lockheed, Bell and Curtiss pursuit ships and Bell cannon-carrying fighters (see p. 15), every Allison is a Prestone-cooled secret.

Last week, however, Allison had its newest secret, the world's most powerful aircraft engine, on display in G. M.'s Building...

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