GalaxyFlyer wrote:Aviation’s conservatism. The idea dates back to the earliest days of flight. Then, in the 70’s, Richard Whitcomb at NASA started experimenting with them. Fuel efficiency was a driver post-73.
GalaxyFlyer wrote:Aviation’s conservatism.
DocLightning wrote:In addition to what GalaxyFlyer said, the benefits of these devices are relatively modest, in the range of 5%. So it took a fair amount of research (time) to develop wingtip devices that would maximize benefit while minimizing weight and additional drag. Keep in mind that these devices increase the lift on the outboard section of the wing, so spar strengthening (ads weight) is necessary. Sharp turns between the wing and a nonplanar winglet (like the 744 winglet) cause interference vortices (drag) and all of these devices increase overall wetted area. So careful design was necessary to minimize the added weight and drag while maximizing the additional lift.
Actually, it's not so much maximizing additional lift but reducing induced drag (a function of lift). Induced drag is reduced by artificially increasing aspect ratio.
Military Aircraft Every type from fighters to helicopters from air forces around the globe
Classic Airliners Props and jets from the good old days
Flight Decks Views from inside the cockpit
Aircraft Cabins Passenger cabin shots showing seat arrangements as well as cargo aircraft interior
Cargo Aircraft Pictures of great freighter aircraft
Government Aircraft Aircraft flying government officials
Helicopters Our large helicopter section. Both military and civil versions
Blimps / Airships Everything from the Goodyear blimp to the Zeppelin
Night Photos Beautiful shots taken while the sun is below the horizon
Accidents Accident, incident and crash related photos
Air to Air Photos taken by airborne photographers of airborne aircraft
Special Paint Schemes Aircraft painted in beautiful and original liveries
Airport Overviews Airport overviews from the air or ground
Tails and Winglets Tail and Winglet closeups with beautiful airline logos