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This paper describes the initial investigation and design of a lightweight racing motorcycle with a single-cylinder 2-stroke engine, capable of producing 60 bhp. The data discussed here pertain to the gas dynamic and mechanical parts and functions of the cycle. Designs of the various components are described and reports of tests on road and test beds verify the viability of this concept of a high specific output and large displacement cylinder for a lightweight, air-cooled motorcycle engine.

An earlier paper by Blair and Cahoon (SAE 710082) described the initial design and development of a 60 hp engine of the single-cylinder 2-cycle type for road racing motorcycle applications. This paper continues with the further design of this engine as a 65 hp 5-speed transmission unit and a variation of it as a 40 hp 4-speed transmission engine for moto-cross racing usage. A discussion of the application of the computer to the design of both engines is included. The computer design is used for the prediction of the required torque/speed characteristics for both engines for their particular application in order to eliminate lengthy test bed development. The mechanical design criteria for the engine/transmission units are also discussed and their implementation for the road race or moto-cross application described.

This paper deals with the performance prediction of one member of a family of thrust producing intermittent combustion engines, namely the pulsejet. The first part is concerned with formulating basic concepts of how pulsejets work. It describes the different methods of providing intake valving action and derives theory to demonstrate the operation of the aerodynamic tuned valve in particular. The second part is concerned with devising a computer program to simulate and predict the performance of valveless pulsejets. The program is based on the method of characteristics for calculating unsteady gas flow. Theories and techniques are given to handle the major problems associated with this application. These problems include the large range of discontinuous temperature and entropy, flow through an area discontinuity and the calculation of mean thrust.