From the course of physics, we are a little fooled: "it is impossible to change the momentum of a conservative system" ... as if ... mass product by speed is constant ... and blah ... blah ...
In fact, this is not so, here is an example: stand on a skate or a sled (a boat is also suitable) on some straight plane ... so that they are perpendicular to the movement ... now carefully make a sharp movement with your legs to the right (or left) at the same time moving body with a skateboard ...
According to the law of conservation of momentum ... you must immediately return after this movement (to the previous start point) ...
Because it is as if the product of the speed and mass of your one part of the body (legs with a skateboard) on the other (arms and torso) should compensate for the movement and neutralize it ...
But this does not happen here ... you are moving only in one direction ... but on the contrary - no ... make another jerk and you are moving forward again ...
In my theory, skate and you are a closed system in which the momentum changes through your sudden movement ... and interestingly, there is no fulcrum ...
In zero gravity, such a movement can lead to nothing more than a movement in one direction of space ...
Roughly speaking ... according to my theory, if it is valid ... you can create a closed-circuit rocket in which exhaust gases (or, for example, a jet of water or weights) do not fly into outer space from a rocket and, after completing the work, are removed ... or condense .. .and again used for thrust (jet) ...
Here, the drive can be a conventional electric motor (a compressor for creating a jet of water) ...
Having made a normal spurt ... Munchausen can also raise himself ...