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[[image]][[/image]] Up front in the Turbo-Prop Race Allison Model 501 for commercial use develops more power for its size and weight than any other Turbo-Prop engine built today. Pay-off on ten years of Turbo-Prop pioneering is the Allison Model 501 engine, commercial version of the T56 which recently completed the most exacting model test ever required of a propeller-type engine. Now in production, this engine develops 3750 horsepower, or 2.3 horsepower per pound of weight—a power-to-weight factor better than any other Turbo-Prop engine available today, and almost 2 1/2 times that of contemporary piston engines. In a typical application, the Allison "501" saves one ton of weight per engine nacelle, and has an engine frontal area of only six square feet—less than half the frontal area of a reciprocating engine with comparable power. Its amazing compactness cuts speed-reducing nacelle drag as much as 60%. These advantages will enable cargo transports powered with these engines to carry heavier payloads faster at far less cost than present aircraft. And in passenger operation, smooth-running Allison Turbo-Props will provide quieter, more comfortable flights—and permit speeds better than 7 miles a minute. Allison Turbo-Props are engines in being—not merely on paper. They are the first American Turbo-Props being built and delivered in production quantities, and have to their credit more actual flight experience than all U.S. Turbo-Props combined. ALLISON Division of General Motors Indianapolis, Indiana Builder of Turbo-Jet and Turbo-Prop Aircraft Engines [[logo]] GM GENERAL MOTORS AIRCRAFT POWER [[/logo]] Allison TURBO-PROP ENGINES More than five-and-one-half million hours of turbine engine flight time... experience where it counts most—in the air! 2 OFFICIAL DIRECTORY and LOG