from what I gather after some short internet searching
OK here is where I become a nerd again
H2O2 was his propellant (hydrogen peroxide)
it uses a chemical decomposition instead of "combustion" (read no ignition source necessary ie no spark plugs). pure hydrogen peroxide is mixed with a "chemical" in the expansion chamber. it can be nitrogen ethanol or even a solid rod acting as a catalyzer. at that point the catalytic reaction breaks apart the molecules resulting in rapid expansion of gasses which are them forced out of a nozzle for propulsion.
it is incredibly inefficient as it consumes massive quantities of "fuel" but because of its simplicity is very light (read: short burst use only).
DAMN that's cool!