3 ms·Many things are used as rocket propellant not least of which O2. As in all things dose makes the poison.by Ygg2 2y agoMany things are used as rocket propellant not least of which O2. As in all things dose makes the poison.chowells 2y agoYou missed a prefix in monopropellant. That "mono-" is doing a lot of work that you ignored.Ygg2 2y agoOh, then add nitrous oxide. There, problem solved. > That "mono-" is doing a lot of work that you ignored. Ironic, given they generally produce less thrust.