http://groups.google.com/group/soc.culture.indian.kerala/browse_thread/thread/3a0be546595ceb1b/253ca288021d26f6?lnk=st&q=air+powered+car&rnum=16&hl=en#253ca288021d26f6
1998
Now that is good information.
Not speculation that it "can't possibly work", but history of failure to follow through on promises.