The DF conversion origonally appeared in the Aug. 1994 edition of Flying Models Magazine, and conversion plans can be ordered from them (Plan # CF 939). It uses a Byron fan.

If you do a search in the Jets forum you'll find lots of information about it. Also you should visit Joe Lupton's web site for some excellent construction photos and additional mods.
http://members.cox.net/jluptonjets/r...techniques.htm

Joe