This doesn't have anything to do with engine conversions, but it's still the coolest thing I've seen lately. It's worth a few minutes of your time to download the video.

http://www.jet-man.com/index_eng.html

Un*bleeping* believable, I can't believe that the mainstream media hasn't picked up this guys story yet. It seems to me his conquered the holy grail of aviation. Very cool indeed, thanks for the link!