Check this youtube video. Just imagine using this as a Ranger extender, the last part is even better.

http://www.youtube.com/watch?v=QmqpGZv0YT4

Read more about the first Air motor of the video here.

http://zeropollutionmotors.us/

But I really like that small rotary motor at the end.
http://www.engineair.com.au/index.htm
http://pesn.com/2006/05/11/9500269_Engineair_Compressed-Air_Motor/

Who need Fuel cell when you can you use Compressed Air???

Here is a thread discussing that very rotary air engine:

Link (http://gm-volt.com/forum/showthread.php?t=15)

Here is a thread discussing that very rotary air engine:

Link (http://gm-volt.com/forum/showthread.php?t=15)

Oups... sorry.. can't seem to able to use the search on this forum

Oups... sorry.. can't seem to able to use the search on this forum

No big deal, I haven't been able to use the Search function right on any site.