What is the difference between winglets and raked wingtips?
Raked Wingtips A raked wing is not a winglet per se, but the tip of wing itself is swept back compared to the rest of the wing. The functionality is similar. The Boeing 787 Dreamliner, some Boeing 777s and the Boeing 747-8 all have raked wingtips, not winglets.
What is a raked wingtip?
Raked wingtips, where the tip has a greater wing sweep than the rest of the wing, are featured on some Boeing Commercial Airplanes to improve fuel efficiency, takeoff and climb performance. Like winglets, they increase the effective wing aspect ratio and diminish wingtip vortices, decreasing lift-induced drag.
What do upturned wingtips do?
Designed as small airfoils, winglets reduce the aerodynamic drag associated with vortices that develop at the wingtips as the airplane moves through the air. Some aircraft are designed and manufactured with sleek upturned winglets that blend smoothly into the outer wing sections.
Why do some aircraft have upturned wingtips?
They also help to improve take off performance and increase aircraft stability, making for a smoother ride. Winglets have been a feature of jets for the past few decades, and their design was inspired by the upturned feathers on bird’s wings as they soar through the air.
Why are the tips of the wings raked?
Raked wingtips, where the tip has a greater wing sweep than the rest of the wing, are featured on some Boeing Commercial Airplanes to improve fuel efficiency, takeoff and climb performance. Like winglets, they increase the effective wing aspect ratio and diminish wingtip vortices, decreasing lift-induced drag.
How much drag does a raked wingtip reduce?
In testing by Boeing and NASA, they reduce drag by as much as 5.5%, compared to 3.5% to 4.5% for conventional winglets. Raked wingtips are installed on the Boeing 767-400ER the Boeing 777-200LR/ 300ER/ Freighter, the Boeing 787-8/ 9/ 10, or the Embraer E-jet E2 for example. The Boeing 737 MAX uses a new type of wingtip device.
Why do Boeing 777s have raked wing tips?
This wing tip design is known as Raked wing tips. Raked wingtips design is where the tip of the wing has a higher degree of sweep than the rest of the wing. Raked wingtips are more efficient in ULTRA LONG cruise segments. Whereas other wingtip treatments like winglets are more efficient in climb.
Which is more efficient, raked wingtips or winglets?
Raked wingtips are more efficient in ULTRA LONG cruise segments. Whereas other wingtip treatments like winglets are more efficient in climb.