Wingtip vortices are a result of the finite length of a wing. Airplanes generate lift by having low-pressure air travelling over the top of the wing and higher pressure air along the bottom. If the wing were infinite, the two flows would remain separate. Instead, the high-pressure air from under the wing sneaks around the wingtip to reach the lower pressure region. This creates the vorticity that trails behind the aircraft. I was first introduced to the concept of wingtip vortices in my junior year during introductory fluid dynamics. As I recall, the concept was utterly bizarre and so difficult to wrap our heads around that everyone, including the TA, had trouble figuring out which way the vortices were supposed to spin. A few good photos and videos would have helped, I’m sure. (Photo credits: U.S. Coast Guard, S. Morris, Nat. Geo/BBC2)
its 2013 can we please have headphones that last more than 2 months
its 2014 can we please have headphones that last more than 2 months
its 2015 can we please have a set of crab overlords that last more than two months
its 2016 can we please overthrow the crab empire people are suffering
Just because a lunar landing anniversary needs a second post today.
45 years ago today, Apollo 11 landed on the first humans on the moon. Neil Armstrong and Buzz Aldrin spent 21.5 hours on the lunar surface.
That’s pretty much how it happened.