I’m not a physicist, but what if you had two microwave emitters mounted opposite sides of a box pointing to a front panel and emitting opposite waves. each wave would bounce towards the other emitter and get cancelled... but the bounce point would receive the energy.
if that worked, then just have loads of paired emitters on the inner walls to increase the force on the front wall.
I believe this would eliminate the opposite reaction when the bounced waves would normally hit the back wall, nullifying the forward momentum. if so, then the forward momentum would allow for as much ‘thrust’ as the energy you have to create the microwaves.
thoughts?
“...each wave would bounce towards the other emitter and get cancelled... but the bounce point would receive the energy.”
I don’t know if this would work. You would have to attune the waves so that they would cancel each other out through destructive interference. If you did that, I think they would cancel out at the reflection point, with no net effect.
You might be able to time it to work though. You would have to turn on only one emitter, then, after that emission hit the front wall, turn on the other emitter to cancel it after the bounce.