http://auto.howstuffworks.com/wiper2.htm

My M-B 190E has a single wiper, and it works well- but only because it has a special cam system to push it out to the corners, like shown on that page. It is a bit of a ricer thing, and I'm not a fan - it doesn't clear the windshield as well as a two wiper system.

-Philip Maynard '95 Contour [71 STS | Track Whore] '97 Miata [71 ES | Boulevard Pimp] 2006 autocross results