In a previous article, "Darkwing Duck \(The Duck, The Myth, The Legend\)" said:
http://www.airliners.net/open.file?id=537804

Anyone know what those fins/blades are all about?

Well, the caption on the picture says MD-81 UHB. If you type that into
Google, you find a wealth of information about the UHB or UDF project.
This one will do for a start:
http://www.aerospaceweb.org/question...on/q0067.shtml


--
Paul Tomblin http://xcski.com/blogs/pt/
Don't even get me started on the MCSEs I know. It's a miracle of
modern technology that some of these fsckwits still draw breath,
much less a paycheck. -- Marc Bowden