Wow! Now you can fly a plane with a sachet of ENO or Pepfizz tablet! Check these out:
http://www.gasparin.cz/?show=frames&site=co2&page=co2/whatsnew/whatsnew&lng=en
http://www.dself.dsl.pipex.com/MUSEUM/POWER/carbonic/carbonic.htm
http://www.animatedengines.com/co2.shtml
http://www.aeronutz.flyer.co.uk/Nov20022.htm
The last url has something of interest for everybody............
Cheers then!
VC