The purpose of this paper is to present an approximate theory of compressible air inflow between reed valves for pulse jet engines. The exact theory of the air intake process for such engines was developed and presented in two papers published under tite sponsorship of Proj¬ect Squid (References 1 and 2).nIn the present analysis the shapes of the reeds during movement are determined. This is done by prescribing the forcing function in the differential equation of the forced reed motion and integrating this equation.
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