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I like the idea of a catapult. At one point I wanted to fly some sort of rocket glider to work. I live in San Diego and I figured I could land on the roof of my work and have a couple safety nets up in case I over shot the landing. I also thought an extra smaller rocket could be used for a go...

I just want to say that I can see several errors in the above discussion. No one has mentioned the fact that an airfoil, in order to produce lift, must pump air in the opposite direction. The energy necessary to lift the aircraft is deposited in the air as downward momentum. So, no matter...

"H2O2 is an oxidiser, not a fuel." While this is true in a chemical sense, one must realize that there is quite a bit of energy bound up in this extra oxygen being attached. The catalyst simply causes this oxygen to liberate itself and be available for oxidizing something. But the huge...