>I'm willing to bet anyone on this...
>Are you willing to wager against me,
>Tom? You'll end up loosing more than
>your shirt.

I'm willing to wager. I'll probably even give you odds. State your claims clearly.

You could get 300 Isp with a warm compressed hydrogen system (possibly even with tridyne), but the SYSTEM Isp would suck badly, given the reqired tank mass to propellant mass. Also note that elevated temperatures reduce gas density, and impact tank material properties.

You can get > 700 Isp with compressed hydrogen and a high temperature heating element you could probably cook up with parts from McMaster-Carr, but the thrust would be miniscule.

In vacuum, there are various non-chemical ways to accelerate gas that can give Isp in the thousands, but you can't fire them in the atmosphere.

The vast majority of clever sounding ideas don't survive contact with reality. Until you have data from a test stand, you haven't demonstrated anything.

I would actively encourage you to build a little test stand and make some compressed air / water rockets to experiment with. You'll shatter a lot of illisions, but you will learn a lot.

John Carmack