You’re on to something, I suppose, but the conservation of momentum does allow for travel in a vacuum. The matter ejected by the thruster pushes against the rocket.
Yes I agree with you in that it would have the undisturbed momentum from pushing off from earth. But no way to slow down, or change course. I’m not sure mater ejected could push back. Surly the vacuum of space would just suck the rocket or thruster empty as fast as possible. . It just bugs me. Lol
It’s very simple actually. If you want to change course or slow down you just eject mass in another direction. To slow down you just spin the rocket around and burn in the opposite direction (or you could have two engines in both directions if you wanted, but I don’t think any rocket has that.)
I’m not sure mater ejected could push back.
Ejected in this case usually means very violently pushing fuel/gas in one direction. There isn’t a small gnome sitting on the engine throwing blocks of fuel into space, even if they technically could have worked. Instead we use very powerful engines.
The ejection itself provides the push back, not the matter. Once the matter has been ejected it doesn’t do jack shit.
Surly the vacuum of space would just suck the rocket or thruster empty as fast as possible. . It just bugs me. Lol
I’m sure they close the valves when they aren’t actively using the engine.
It’s not like fuel injectors in cars just constantly spray out fuel, even when parked.
It could be tested to a degree with a vacuum chamber here on earth. Put a little rocket inside horizontally and see if it moves when fired in a partial vacuum.
You’re on to something, I suppose, but the conservation of momentum does allow for travel in a vacuum. The matter ejected by the thruster pushes against the rocket.
They’re not on to anything here. As further stated by your comment.
Yes I agree with you in that it would have the undisturbed momentum from pushing off from earth. But no way to slow down, or change course. I’m not sure mater ejected could push back. Surly the vacuum of space would just suck the rocket or thruster empty as fast as possible. . It just bugs me. Lol
It’s very simple actually. If you want to change course or slow down you just eject mass in another direction. To slow down you just spin the rocket around and burn in the opposite direction (or you could have two engines in both directions if you wanted, but I don’t think any rocket has that.)
Ejected in this case usually means very violently pushing fuel/gas in one direction. There isn’t a small gnome sitting on the engine throwing blocks of fuel into space, even if they technically could have worked. Instead we use very powerful engines.
The ejection itself provides the push back, not the matter. Once the matter has been ejected it doesn’t do jack shit.
I’m sure they close the valves when they aren’t actively using the engine. It’s not like fuel injectors in cars just constantly spray out fuel, even when parked.
It could be tested to a degree with a vacuum chamber here on earth. Put a little rocket inside horizontally and see if it moves when fired in a partial vacuum.