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Wingtip devices are intended to improve the efficiency of fixed-wing aircraft by reducing drag. Wingtip devices can also improve aircraft handling characteristics and enhance safety for following aircraft.
Such devices increase the effective aspect ratio of a wing without greatly increasing the wingspan.
Extending the span would lower lift-induced drag , but would increase parasitic drag and would require boosting the strength and weight of the wing.
At some point, there is no net benefit from further increased span. There may also be operational considerations that limit the allowable wingspan e.
Wingtip devices increase the lift generated at the wingtip by smoothing the airflow across the upper wing near the tip and reduce the lift-induced drag caused by wingtip vortices , improving lift-to-drag ratio.
This increases fuel efficiency in powered aircraft and increases cross-country speed in gliders , in both cases increasing range. Air Force studies indicate that a given improvement in fuel efficiency correlates directly with the causal increase in the aircraft's lift-to-drag ratio.
The initial concept dates back to , when English engineer Frederick W. Lanchester patented wing end-plates as a method for controlling wingtip vortices.
Somerville patented the first functional winglets in Somerville installed the devices on his early biplane and monoplane designs.
Sighard F. Hoerner was a pioneer researcher in the field, having written a technical paper published in  that called for drooped wingtips whose pointed rear tips focused the resulting wingtip vortex away from the upper wing surface.
Drooped wingtips are often called "Hoerner tips" in his honor. Gliders and light aircraft have made use of Hoerner tips for many years.
The earliest-known implementation of a Hoerner-style downward-angled "wingtip device" on a jet aircraft was during World War II. This was the so-called "Lippisch-Ohren" Lippisch-ears , allegedly attributed to the Messerschmitt Me 's designer Alexander Lippisch , and first added to the M3 and M4 third and fourth prototypes of the Heinkel He A Spatz jet light fighter for evaluation.
This addition was done in order to counteract the dutch roll characteristic present in the original He design, related to its wings having a marked dihedral angle.
This became a standard feature of the approximately completed He A jet fighters built, with hundreds more He A airframes going unfinished by V-E Day.
The term "winglet" was previously used to describe an additional lifting surface on an aircraft, like a short section between wheels on fixed undercarriage.
Richard Whitcomb's research in the s at NASA first used winglet with its modern meaning referring to near-vertical extension of the wing tips.
The wingtip vortex, which rotates around from below the wing, strikes the cambered surface of the winglet, generating a force that angles inward and slightly forward, analogous to a sailboat sailing close hauled.
The winglet converts some of the otherwise-wasted energy in the wingtip vortex to an apparent thrust. This small contribution can be worthwhile over the aircraft's lifetime, provided the benefit offsets the cost of installing and maintaining the winglets.