This is the Ram Accelerator


The ram accelerator is a scalable hypervelocity launcher capable, in principle, of accelerating projectiles to velocities greater than 8 km/s (18,000 mph) and was developed in 1983 by researchers of the Department of Aeronautics and Astronautics at the University of Washington. This device operates as an in-bore ramjet in which a subcaliber projectile, shaped like the centerbody of a cylindrical supersonic ramjet, is propelled through a stationary tube filled with a pressurized gaseous propellant mixture of fuel, oxidizer, and diluent.

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