[HuntsvilleTxVeteran]

http://www.starrotor.com/indexflash.htm

this new braxton cycle seems to be workable.
I believe when prototype is finished,
it will be the engine of most cars!

[LibertarianInExile]

This is a car engine. I understand that fuel cells are more efficient at using hydrogen than gas engines are at using gas, and I believe they're less environmentally problematic in cars than gas engines--they emit water. But the site you sent me doesn't address the expense of producing the hydrogen for the car to run on, or the expense of refitting hydrogen distribution plants. And I have yet to hear someone tell me how we're to produce the hydrogen in an environmentally friendly fashion in the first place. Doesn't that stuff require steam to produce (like electricity)? Wouldn't that necessitate gas or methane boilers, too?