Actualy Its fairly simple. Space Ship One uses 2 ingredients. n2o which is used in racing "At room temperature, N2O is quite unreactive with most substances, including alkali metals, halogens, and even ozone. It is therefore widely used as a propellant in aerosol cans in place of the CFCs which can damage the ozone layer. When heated sufficiently, however, N2O decomposes exothermically to N2 and O2." So you see its the freed oxygen which fuels the burn. The rubber is simply a steady burning material. Rubber fires last a long time.
"A sort of fun explosive is potassium permanganate mixed with powdered sugar. The idea is to mix one ingredient that will burn very fast with a second ingredient that will supply enough oxygen for that burning. This burns so fast, it's an explosion."--Chuck Palahniuk
The rest is e=mc2
http://answers.google.com/answers/threadview?id=477866 . See childs play.
In other words, burn something lose mass. That mass becomes energy. It can be used to creat force, by causing say n2o to decompress exotherically, hense leaving you with oxygen to burn, while throwing the lost molecule. Energy is a useful thing in conversions. To seperate the hydrogen in water, run electricty through it.
Hydrogen can then be used to create energy on the spot, given fuel cells.
Of course you use more energy creating the hydrogen than it creates with fuel cells...
Rocket science isn't brain surgergy.
Its mostly just physics, expressed mathmaticaly.
Its not so hard to learn, hell I only have a GED.
Try using moving Feynman type diagrams when imagining the physics behind it. You might have to invent your own symbols for expressing this. Its just a matter of imagination. A writer should be good at this.
They should teach this stuff in grade school. Then it would be easier for everyone to understand. Easier to teach to. Kids are less distracted, and better at understanding abstract concepts. Especialy when dealing with explosions (they love that sh-t). The math could come later, I'm sure it wont be included in your book. The concept is childs play.