Search Results

THIS paper describes the operational and performance characteristics which will make the DC-8 jet transport capable of economical operation over both long- and short-range routes of reasonably high traffic density. It is shown, for example, that the effects of operation with one or two engines inoperative, the effect of high ambient air temperatures, and effects of flying at nonoptimum altitudes, while different from reciprocating-engine aircraft, will permit easy integration of the jet transport into existing airline operations. Furthermore, the jet transports will have such short take-off distances when carrying fuel sufficient for short and moderate ranges that most existing airport runways, now used for DC-6B and DC-7 operation, are of sufficient length for jet-transport operation.

THREE factors involved in braking are energy conversion rate, heat storage capacity, and heat dissipation rate. These are used by the author in proposing a method for rating brakes. Ultimately a brake rating system will involve many variables, some of which must be determined from experimentation. The present rating method of gvw per square inch of bake lining area would form a good basis for rating brakes if certain limitations and corrections are made.

From this first specification which resulted in the use of heavy duty diesel engine oil, engine performance has been recognized by the Navy as paramount in oil selection. Engine tests designed to evaluate such engine performance have been and will continue to be of primary importance to the procurement of diesel engine lubricating oils for Navy service. This paper outlines changes in engine test procedures dictated by continuing application of the above stated premise. Results from small and large engine tests of oils used by the Navy are shown together with some results from tests of high additive oils which might be applied to future needs as may be dictated by high output performance demands on Navy diesel engines.

This engine originally intended for use in our own heavy equipment proved to have in its basic conception and design the potential for application in other fields. Design and development of the line of P&H Diesel engines is described, stressing as main features: performance, simplicity, reliability and unusually good serviceability; even with a low specific weight lb/hp ratio and small overall dimensions.

Trends and problems in the design of four-cycle, high performance Diesel engines in the 600 horsepower to 1000 horsepower range are discussed. The basic design features of the new Continental 750 horsepower air-cooled Diesel engine are explained with particular reference to the high performance requirements. Three foreign Diesel engines are shown to illustrate various design approaches. A short outlook into the foreseeable future concludes the paper.