Aloha.
It has been over two years since visiting this site.
I know this post is under the wrong topic,
so moderator may move to suit.
Alaskastar has finally replicated the Lee Rogers air car,
but even taken it to the next level.
See the basic build introduction on my you tube channel "mrgalleria".
We are modifying gas engines to run closed loop
with a refrigerant, and using the ac pump to add pressurized refrigerant through an lpg injector in the spark plug hole.
This is a good design using ambiant heat as fuel.
I feel it is much better than water fuel.
Bill