Project Orion Nuclear Propulsion - 1950s Tests | Unclassified Video

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Cites techdragon · 2019-06 · on “Two potentially life-friendly planets found orbiting a nearby star”

Actually we do know it would work. The fundamental physics are sound. A pusher plate can in fact transfer net positive momentum from a series of explosive shockwaves detonated aft of the pusher plate in the desired direction of travel. There’s plenty of video footage from the Hot Rod tests showing it working. [this video] The hot rod test article was actually donated to the national air and space museum unfortunately it is not currently on display. [LINK] And for the realities of scaling up from conventional explosives to nuclear detonations you can read a little more here [LINK] and [LINK] (scroll down till you get tot project Orion and they have a pretty good summary) And the Project Rho inform

Cites bjo590 · 2020-09 · on “The EmDrive just won't die”

> Project Orion Here is some declassified test footage of Project Orion. I don't believe any of the test crafts used nuclear explosions, but you'll get the idea from this footage (on why it's a terrible idea that could only exist in the 40s or 50s) [this video]

Cites ArnoVW · 2020-09 · on “Compact nuclear fusion reactor is 'very likely to work,' studies suggest”

Orion was essentially an "external combustion engine". I.e. you have a huge piston that is driven by repeated explosion of nuclear bombs. With a spring mecanism to even out the whallops. And no "engine block" around it. It did not generate electricity, and given the discrete/pulsed nature of the mecanism, I have a hard time seeing how you would "even out" the output, should you decide (somehow) to attach it to a generator. Let alone imagining how you would transport said electricity back to earth. Because, don't forget, it was possible to have an external combusion engine because it was in space. Even by 50's standards, the project was judged a non-starter for atmospheric flight, from enviro

Cites techdragon · 2021-08 · on “Interstellar nuclear-powered transport (1968) [pdf]”

Usually it boils down to ablatives. Either your pusher is designed to ablate at a known rate and factored into the propulsion calculations as fuel mass, or you are protecting the pusher plate by doing something like injecting synthetic oil that wont spontaneously boil in the vacuum of space through pores in the pusher plate so that the oil becomes a protective layer that boils off instead of eroding the surface of the pusher plate. The other method I've seen is to "go big" and scale things up to the point where the pusher plate is collecting enough force, but spread over a sufficient area that while the pusher can effectively and "safely" capture the plasma debris from the pulses while keepi