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The “Dyna-Star” engine concept makes possible very compact, lightweight designs for both diesel and spark ignition engines within the area of current industrial practice, and with low manufacturing cost potential. This article describes in detail the various configurations examined to date and provides pertinent development data concerning size, weight, and performance characteristics of the Dyna-Star engines currently being developed in the Thiokol laboratories.

PERFORMANCE characteristics of the German BMW-003 and Jumo 004 engines as a whole, as well as of their principal parts, are presented here. This paper, the authors point out, is not the result of experimental determinations in this country, but is rather a résumé of data obtained from German sources. The discussion is divided as follows: 1. Performance of complete machine. 2. Compressor performance. 3. Combustion-chamber performance. 4. Turbine performance. 5. Miscellaneous operating characteristics.

VIBRATION characteristics and considerations of simplicity, rather than those of operating efficiency, have dictated present methods of aircraft operation, the authors contend. The bmep parameter proposed in their paper, they explain, is based upon cruising operation at or near maximum efficiency of the engine-airplane-propeller combination. They stress the importance of cruising-flight control by pointing out that cruising flight embodies 95 to 99% of all commercial flying. The authors show how the parameter is related fundamentally to the operating efficiency of the engine as defined by fuel consumption and, therefore, to the overall efficiency of the airplane-engine-propeller combination. The parameter is discussed further as related to the engine alone; as tempered by considerations of airplane and propeller efficiency; as applied to the physical problem of controlling cruising power; and as limited by engine and airplane design.

HOW the airlines can obtain laboratory-precision power control by means of a torque meter, is explained by Mr. Lundquist. He tells how the device provides an accurate method for controlling both brake horsepower and fuel-air ratio. The simplicity of the method is stressed, and its limitations under various operating conditions are brought out. In this paper the author presents an impartial discussion of the principal phases of the general problem to assist airline operators in evaluating the possible benefits that they individually might achieve by the use of torque meters. He points out that the long-range operator is the only one who probably will realize any appreciable improvement in operating efficiency by the use of the torque meter, and even he must survey carefully his present operations to ascertain whether or not he already is operating so near to maximum efficiency that the application of the torque meter will not produce any benefits.