OK, it's not a bike. I make bike frames and spend a lot of time fooling around on bikeforums so I figured I would share.
The is a device, a copy (and upgrade) of one that belongs to UNH. I used 4130 alloy tubing and built a light/straight machine that has adjustable "fine tuning". It is propelled by polling and used XC ski bindings mounted in tandem. The owner is fabricating the soft goods. This one weighs 5 lbs.
29 040 by frankthewelder, on Flickr
29 041 by frankthewelder, on Flickr
During the build
29 036 by frankthewelder, on Flickr