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  • ISO

    It works on the same concept of traditional ion engines in that it uses a powerful magnetic field to accelerate particles of fuel backward and thus push the spacecraft forward. Typically a spacecraft has to carry this fuel with it onboard in order to have access to it. The breakthrough comes with a new method that scientist have found to use quantum particles that are in the surrounding space as this fuel instead. This means that spacecrafts using this method would never run out of fuel so long as they had electrical energy or power.

    • rosellem

      Thank you. Just what I was looking for.

      • Lorkhan

        Only it appears to be wrong. The thing that is strange about the behavior of the device is that nothing is being emitted from it. The microwaves from the magnetron are guided into an entirely closed, bell shaped chamber and bounce around inside of it, and somehow, in that bouncing around, the thrust is generated.

        • Havear

          Indeed. I'd like to also add, in case it gets brought up, that there is a reaction drive that converts energy to thrust -- and it's called a photon drive. The problem with using straight energy for thrust is that it takes an absolutely ludicrous amount of power to generate even small amounts of thrust.

          • shadow1515

            Wouldn't this be good for a deep space probe though, since it can just accelerate forever (even if the acceleration is slow) and eventually attain huge speeds since it doesn't ever run out of fuel?

          • Havear (edited 3 years ago)
            @shadow1515 -

            Except the acceleration is too low for even that, and it'd likely end up more efficient to use even something like an antimatter pion drive. Hell, you might be able to even get more thrust from something as low-acceleration as a plasma sail and simply "sailing" around stars en route to your destination, making use of gravity assists. It largely depends on how much power one's willing to expend on the photon drive.

            For a quick calculation, let's assume we have a turbine from the largest dam in the world, the Three Gorges Dam. They weigh 6,000,000 kgs and output 700 MWs each. Just from those stats (and neglecting pesky stats like where the fuel is coming from or the engine weight), it would output 2.3 newtons of thrust for a total acceleration of (2.3N = 6,000,000 kgs * x m/sec^2) 0.000000383 m/sec^2, or 0.000000039 Gs. To put that into perspective, using the formula (300,000 m/s / 0.000000383 m/sec^2) we get 2483.8 years. It takes two and a half millennia to accelerate to a measly 1% of lightspeed.

          • spacepopper
            @Havear -

            It is indeed a very slow form of acceleration at this point. Here is to hoping the many minds we have will improve on the concept over the next two decades, we must remember this technology is still in its infancy, actually we aren't even 100% sure it works as described yet.

        • Rothulfossil

          Holy shit. I just learned about the Netherlands' new roadside, sound-dampening solar panels earlier today. Basically, light enters the panels, bounces around for a bit, and is ultimately collected by thin solar cells on the side, creating a much more concentrated amount of light energy. (At least, that's how I understood it.)

          Is there anything we can't solve by having things bounce around a lot in an enclosed space?

    • sixstorm

      The unsung hero.