So what if you used neutral particle?
Yes. We simply call this reaction mass.
You throw it out the back end of the rocket, and your rocket goes the opposite direction.
The thing is, it doesn't get around the primary problems of rocketry:
1] storing all that mass (and thus moving it, as dead-weight)
2] accelerating that mass to a high velocity
If the mass is not chemically active, then you need a device (motor) that accelerates it. And that device will need fuel to power it,
Our solution is to use chemically-active mass. You don't need a motor to accelerate it - the energy is stored chemically within the mass itself - often some form of oxygen and hydrogen - and released simply by combining and igniting them. Not much to go wrong with a fuel tank, a valve, a spark and an exhaust nozzle.
Edited by DaveC426913, 01 August 2018 - 07:06 PM.