BASIC PROBLEMS IN THE DESIGN OF HIGH-OUTPUT AIRCRAFT ENGINES

Here is presented an analysis of important technical problems in the design of high output aircraft engines. Different methods of boosting the output are fundamentally considered. The method of supercharging is revealed to be the most promising one. Design limitations to high outputs are stress, heat dissipation, piston speed and detonation; the removal of each limit would require, beside chemical and metallurgical improvements, the use of spark control valve overlap and injection of anti-detonating or artificially-cooling liquid. The utilization of energy from exhaust gas is highly advised. Numerical example is shown for a design of 3000 H.P. engine and possible arrangements of cylinders are compared. Necessary alterations in design are recommended to acquire high specific output.