Why aren't cars dimpled like golf balls if it increases fuel efficiency? [more inside]
posted by tehloki on Oct 25, 2009 - 28 answers

How does a plane that generates less thrust than weight stay in the air? Assuming in level flight that thrust=drag and lift=weight, where is the lifting force coming from, if not from the drag on the wings? [more inside]
posted by OldReliable on Aug 2, 2007 - 23 answers

It's often quoted that a Formula 1 race car creates enough aerodynamic downforce to let you drive it across the ceiling. Has anyone ever proved this? If not, why not?
posted by twine42 on Sep 11, 2006 - 34 answers

Last night on ABC news there was a guy with a VW beetle (silver) who put a wicked-huge wing on the back and claimed some ridiculously-high MPG figure. Alas, my google fu fails me. Why would this wing possibly work? They guy wasn't a tuner, AFAICT.
posted by Wild_Eep on May 5, 2006 - 27 answers

Would a helicopter make a good makeshift windmill? [more inside]
posted by lazy-ville on Sep 12, 2005 - 17 answers