This is a deuterium rocket engine that exploits the density of Deuterium. It is capable of running for a long amount of time and releasing vast amounts of lift. If you want to exponentially increase the density and power output of the engine enter into console the following: "set life deut 99999999999".
I know it's simple, that's the beauty :P feedback and suggestions greatly appreciated!
EDIT: I recommend you don't try the console thing after starting the simulation. It may cause the whole screen to fill with DEUT particles, and if you try to delete them you will crash Powder Toy.