Physicists say an interstellar engine popularized in the '60s is technically feasible, but it would take a more advanced civilization to build one.
published in the journal Acta Astronautica, and alas, they have found the ramjet wanting. It's feasible from a pure physics standpoint, but the associated engineering challenges are currently insurmountable, the authors concluded., a trusted source for technology news, tech policy analysis, reviews, and more. Ars is owned by WIRED's parent company, Condé Nast.
A ramjet is basically a jet engine that "breathes" air. The best analog for the fundamental mechanism is that it exploits the engine's forward motion to compress incoming air without the need for compressors, making ramjet engines lighter and simpler than their turbojet counterparts. A French inventor named Rene Lorin received a patent in 1913 for his concept of a ramjet , although he failed to build a viable prototype.
A basic ramjet has three components: an air intake, a combustor, and a nozzle. Hot exhaust from fuel combustion flows through the nozzle. The pressure of the combustion must be higher than the pressure at the exit of the nozzle in order to maintain a steady flow, which a ramjet engine achieves by "ramming" external air into the combustor with the forward speed of whatever vehicle is being powered by the engine. There is no need to carry oxygen on board.
Robert Bussard thought the concept might be modified as a means for interstellar propulsion. The basic premise outlined in
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