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Originally posted by phg22
There was a thread here talking about Lockheed's Box Wing AMA program, and I wanted to clarify something. One major advantage of nonplanar wings (box wings, ring wings, winglets [like on the 747-400], and heck even X-wings is that the induced drag caused by the tip vortices at the end of a planar (regular monoplane) wing is greatly reduced. I'm researching this stuff now for an Aerodynamics class, and thought I'd spread a little enlightenment.
Check Ilan Kroo's paper “Drag Due to Lift: Concepts for Prediction and Reduction” in the 2001 Annual Review of Fluid Mechanics. Great stuff.
Haven't had much time to check for other threads, if someone else posted this,