Why does the 777 300er have no winglets

This would cause the aircraft to be classified under aerodrome code F. This categorization is the same as larger aircraft such as the Airbus A and Boeing , and would limit its versatility.

Manufacturers also have to consider the added weight that winglets give to an aircraft. Furthermore, later designs, such as the F pictured below, feature raked wingtips.

This profile change at the end of the wings offers similar efficiency benefits to winglets. Looking to the future, the upcoming Boeing X series will boast a variety of technological improvements over its predecessors.

One of these futuristic aspects will be folding wingtips. Boeing is set to be the first manufacturer to deploy such technology on a commercial airliner.

However, interestingly, its European competitor Airbus also patented a similar system in However, by folding the wingtips inwards on the ground, this is reduced to Much like previous triple-seven variants, this means the X is just narrow enough to be classified under aerodrome code E. Boeing considered all the options before deciding to go with this option: Dave Akiyama, manager of aerodynamics engineering in Boeing product development, points out that designing winglets can be tricky-they have a tendency to flutter, for example.

Improve this answer. Many thanks to your crystal-clear answer. Frank Frank 2, 10 10 silver badges 11 11 bronze badges. Also you are answering a question thats over a year old. In order for winglets to go up, they have to go out as well. On the , for example, it was drastic enough 13 feet of extra clearance on each side, if memory serves for my operator to opt out of winglets entirely as it would have required an extraordinary amount of extra gates.

The difference between lost lift vs. So, yes, it is a significant factor. Sorry for the thread necromancy. Usually an airline would be considering which aircraft to order whereas an airport would be considering how to lay out their gates. Your comment implies consideration of both by one entity which isn't something I've come across before. Sign up or log in Sign up using Google.

Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. Featured on Meta. Now live: A fully responsive profile. Version labels for answers. Linked Related Hot Network Questions. Question feed. Aviation Stack Exchange works best with JavaScript enabled. What you see are "winglets," and they have essentially become standard equipment on all new airliners.

Winglets allow the wings to be more efficient at creating lift, which means planes require less power from the engines. That results in greater fuel economy, lower CO2 emissions, and lower costs for airlines. An airline that installs winglets on its fleet of 58 Boeing jets is expected to save , gallons of fuel annually. Winglets help mitigate the effects of "induced drag. Near the wing tips, the high-pressure air under the wing rushes to the lower-pressure areas on top, which results in the creation of vortices.

The vortices flow in a three-dimensional manner over the wings. They not only pull air up and over the wing, but they also pull air back. That third component is induced drag. With the advent of winglets, the aircraft is able to weaken the strength of wingtip vortices and, more important, cut down on induced drag along the whole wing.

But in many instances, airplane makers simply don't have the option of making the wings longer. For example, narrow-body airliners such as the Boeing and often operate from gates at airports designed for short- to medium-range domestic flights. Since these flights usually require smaller aircraft, they have less room apportioned to them.