>>11289506it doesn't take a lot of proponent.
if I threw a pebble in space, I'd achieve some reactive force. If I thew a pebble really really hard, i'd achieve a much greater reactive force.
Since the moment of inertia for space craft trajectories is usually linear, it doesn't require much delta v to assist a craft to gain more velocity in its zero atmosphere trajectory (as opposed to say, doing a u-turn in space without a gravity assist).
in other words, if i'm going face forward in the vacuum of space, I can achieve an easy increase in relative velocity by farting out of my ass (propellant); where the smelly gas is pushing against my anus and propelling my body ever forward.
the harder and longer I fart, the faster I go.
same principle as rocket science except if I ignite my methane farts (farts naturally contain oxygen), the combusion would excite the gas mixture to expand and cause a greater force reaction against my ass and push me even further at the cost of scorching my buttocks and degenerating the gas mixture into CO2 and water.
