I made a "reactor" where you put any fuel in.
EDIT: this is a brand new upgraded version, should work very well now.

Note: Don't try it with nuclear stuff, it makes too much pressure.

Thanks, so used to the old forums.
EDIT: So, anyone have any opinions on this?

trystanr:

Lol.... XD

What does that mean exactly?

I know, but what is wrong with it?
Also I upgraded it, so maybe if it didn't work for you, it will now.

I don't know. LO2 is pretty good, but the last parts of it turn into oxygen and get stuck. Liquid Rubidium is pretty good.