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THIS paper presents a brief history of the experience of Pratt & Whitney Aircraft, division of United Aircraft Corp., in building high-powered air-cooled radial aircraft engines. Pictures and diagrams of the plant layout are analyzed in such a way as to show the unusual foresight employed in providing for the future. This arrangement has permitted quick expansion without disturbing production or without revising any of the important features of the original layouts. Engines are not assembled for stock, and schedules are based on customer requirements with special treatment for Army, Navy and commercial engines. The important part played by inspection and quality control is outlined together with the method of fitting it into the production scheme and the method of meeting the special requirements of Army and Navy.

THIS paper-which received the SAE Manly Memorial Medal for 1952-presents a survey of special-purpose instrumentation required for development testing of aircraft gas turbine engines and their components. They are divided into: 1. Instruments to investigate the mechanical operation of the engine. 2. Instruments to measure the quantity and state of the working fluids-fuel, air, and combustion gases-as they pass through the engine.

THIS discussion of steels and protective treatments for use up to 1000 F is divided into three parts. First, the factors involved in the selection of appropriate steels are covered, emphasis being placed on the role of martensitic chromium steels, which combine strength with rust resistance. The effects of rusting of these steels and its prevention, as well as elevated-temperature considerations, are discussed. Second, stress-corrosion of martensitic chromium steels is covered, and ranges are established in which these steels are prone to failure by this mechanism. Third, the authors deal with protective coatings and set down the temperature ranges in which the protective coatings are used to advantage.

AN effective method for silencing, to an agreeable amount, the noise produced by a jetengine exhaust system is described in this paper. The principle employed is based on the fact that high-frequency noises are more rapidly attenuated with increasing distance from the source than low-frequency noises. Basically, the performances of the developed silencers are to reduce the amount of noise of a jet exhaust by increasing the frequency range of the noise produced. Full-scale silencers have been developed for use as ground equipment. Scale models of airborne silencers have been studied and show promise for full-scale development, however, further studies are required to minimize disadvantages to airborne applications.