I agree that we should not belittle any experimentation and that this guy should be encouraged to experiment, but I doubt this particular idea will yield anything useful for the masses. I get a feeling that the amount of propane required for a ten minute flight will be like the old JPX days (with a very heavy tank) and then you have the dangers of pure LO2 and another heavy tank. Seems an order of magnitude easier and more practical to fly one of our existing turbines, not to even mention the safety issues of LOX!!!