With a 200cc lawnmower engine, a handmade propeller, and some spare paraglider parts (that he just happened to have kicking around?), Russian tinkerer Sergei Khvalin created a cross-country skiing rig that can send him zipping across the snow at speeds of 40km/h.
It weighs 11kg, and thus, he explains, can also serve as a work-out device. It's not a bug, it's a feature! [The Awesomer]