winglet

Since their other winglet designs are on modern Boeing airplanes, there must be a reason for that.

The split winglet added 1–1.5% fuel burn reduction, a re-lofted tail cone added an additional 1% reduction.

Just consider the takeoff where the wingtips were scraping the runway and one winglet fell off.

They developed the spiroid winglet that is a loop at the end of the wing, claiming increased efficiency over plain winglets.

Although I like to do a variation where I fold the wing tips to create a kind of 'winglet'.

The long range Dassault version with the extra winglet option can do 8800km.

A feet of vertical winglet replaces 3 feet of horizonal wingtip.

Still not a good explanation for the winglet job though.

The winglet one was chosen for marketing reasons.

Also, if the power output can increase by anything near the claimed amount (8 and 4 percent for different sizes of winglet), why don't current turbines use them?

Mind you, the following is just rumor talk: An aerodynamicist who used to work for the company once told me that when Airbus (in this millennium) designed a certain plane, they had a wing design with and without a winglet.

You won't be able to calculate optimal airfoils with this model, or even a winglet, but it's good enough for many of the usual little riddles like symmetric airfoils, inverted flying etc.

In reality, 95% of graduates will spend the next 40 years optimizing the efficiency of a winglet on a 747." Security feels similar.

Every so often someone posts a photo of a plane with a missing winglet and asks why it was allowed to fly when "the wing was broken" (missing a winglet will do nothing except decrease fuel efficiency a bit).

In a GPS world, you're flying the exact centerline of the airway and will have no lateral separation with other aircraft on that airway unless you "fly right." An example of an accident because of that is the one in Brazil, where a private jet's winglet sliced through the wing of GOL 1907, a 737.

Winglet’s and other aerodynamic improvements are just one example where energy efficiency directly reduces energy usage per GDP.