A Bounce-Recoil Engine: Cyclic Thrust from Repeated Compression Against the Density Bound

This paper presents a complete design study of a bounce-recoil engine that draws cyclic thrust from repeated compression of a hydrogen charge against the density bound, computed throughout from stated assumptions. At a cycle frequency of 10 Hz the engine delivers a mean thrust of 24.0 N at a mean power of 180.0 kW, consuming 432.0 kg of hydrogen per hour. At 50 Hz the thrust rises to 120.0 N and the power to 900.0 kW, while at 1 Hz the thrust is 2.4 N. Every figure is a computed result of the stated model and nothing was built or tested: the study is SIMULATED, NOT MEASURED, and its limits are stated as plainly as its performance.