When doing my usual round of browsing pictures of pretty airplanes this afternoon, I stumbled across an intriguing picture of the A340 prototype (CN 001) F-WWAI taken late 2003, fitted with a pair of 737NG-style winglets rather than the usual 747-400-style.
http://www.airliners.net/open.file/471618/L
Can anyone closer to the action tell me a bit more about this modification and winglets in general? In particular; how do long, slender winglets compare to their shorter, stubbier counterparts?
