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The winglets increased the 747-400's range by 3.5% over the 747-300, which is otherwise aerodynamically identical but has no winglets. The 747-400D variant lacks the wingtip extensions and winglets included on other 747-400s since winglets would provide minimal benefits on short-haul routes while adding extra weight and cost, although the -400D ...
The winglet and red navigation light on the wing tip of a South African Airways Boeing 747-400 Many aircraft types, such as the Lockheed Super Constellation shown here, have fuel tanks mounted on the wing tips, commonly called tip tanks The wing tip of a Quad City Challenger II, formed with an aluminum bow The wing tip of a Grumman American AA-1, showing its Hoerner style design A Piper PA-28 ...
Such wings however have disadvantages with respect to structural constraints and maneuverability, as evidenced by combat and aerobatic planes which usually feature short, stubby wings despite the efficiency losses. Another method of reducing induced drag is the use of winglets, as seen on most modern airliners.
Winglets have the opposite effect to washout. Winglets allow a greater proportion of lift to be generated near the wing tips. (This can be described as aerodynamic wash-in.) Winglets also promote a greater bending moment at the wing root, possibly necessitating a heavier wing structure
The winglets improve fuel efficiency by five percent and increase range by 200 nautical miles (370 km; 230 mi) through the reduction of lift-induced drag. [ 87 ] [ 88 ] Continental Airlines was the first carrier to order winglets for the 757-200 , and in February 2009 became the first operator of 757-300s with winglets. [ 89 ]
An optional upgrade with winglets became available for the Classic and NG series. The 737-300 and 737-500 can be retrofitted with Aviation Partners Boeing winglets, and the 737-300 retrofitted with winglets is designated the -300SP (Special Performance). WestJet was to launch the 737-600 with winglets, but dropped them in 2006. [51]
There are a handful of airlines that do have seats that face backward. If you do want to try out a rear-facing airplane seat, opt for business class seats with airlines like American, United ...
Wake turbulence is a type of clear-air turbulence.In the case of wake turbulence created by the wings of a heavy aircraft, the rotating vortex-pair lingers for a significant amount of time after the passage of the aircraft, sometimes more than a minute.