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Wingtip devices are intended to improve the efficiency of fixed-wing aircraft by reducing drag. Although there are several types of wing tip devices which function in different manners, their intended effect is always to reduce an aircraft's drag by partial recovery of the tip vortex energy. 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.
The Advanced Soaring Concepts Apex was a remotely piloted sailplane designed to take part in a NASA study of high-altitude aerodynamics.
The X-26 Frigate is the longest-lived of the X-plane programs. The program included the X-26A Frigate sailplane and the motorized X-26B Quiet Thruster versions: QT-2, QT-2PC, and QT-2PCII. All were based on the Schweizer SGS 2-32 sailplane.
Einar K. Enevoldson was the director of the Perlan Project. He was a civilian research pilot for NASA's Hugh L. Dryden Flight Research Center, Edwards, California, from 1968 until 1986. He was involved in many research programs, including those with experimental wings, propulsion and digital computer flight control systems.
Richard E. Schreder was an American naval aviator and sailplane developer, responsible for design and development of the HP/RS-series kit sailplanes marketed from 1962 until about 1982. Schreder also founded and ran Airmate, a successful drafting supplies company.
Paul F. Bikle was director of the U.S. National Aeronautics and Space Administration (NASA) Dryden Flight Research Facility from 1959 until 1971, and author of more than 40 technical publications. He was associated with major aeronautical research programs including the hypersonic X-15 rocket plane, and was a world record-setting glider pilot.
The Schweizer SGS 2-33 is an American two-seat, high-wing, strut-braced, training glider that was built by Schweizer Aircraft of Elmira, New York.
A glider is a fixed-wing aircraft that is supported in flight by the dynamic reaction of the air against its lifting surfaces, and whose free flight does not depend on an engine. Most gliders do not have an engine, although motor-gliders have small engines for extending their flight when necessary by sustaining the altitude with some being powerful enough to take off by self-launch.
The Schweizer SGS 1-26 is a United States One-Design, single-seat, mid-wing glider built by Schweizer Aircraft of Elmira, New York.
The BJ-1 Dyna Mite, or California Sailplanes Duster was a sailplane designed by Ben Jansson in the United States in the 1960s for homebuilding.
The Schweizer SGU 1-19 and Schweizer SGU 1-20 are a family of United States single-seat, high-wing, strut-braced, utility gliders built by Schweizer Aircraft of Elmira, New York.
The Schweizer SGU 2-22 is an American two-seat, high-wing, strut-braced, training glider built by Schweizer Aircraft of Elmira, New York.
The Schweizer SGS 1-36 Sprite is a United States, single-seat, mid-wing glider built by Schweizer Aircraft of Elmira, New York.
The T.31 Tandem Tutor is a British military training glider, designed and built by Slingsby and used in large numbers by the Air Training Corps between 1951 and 1986.
The Briegleb BG-6 was a 1930s single-seat glider designed by William G. Briegleb to be both factory and homebuilt.
The Pipistrel Taurus is a Slovenian self-launched two-seat microlight glider designed and built by Pipistrel.
The Rutan Model 77 Solitaire is an American, single seat, canard, mid-wing motor glider that was developed by Burt Rutan in response to the 1982 Sailplane Homebuilders Association Design Contest for a homebuilt glider. It first flew in 1982. The Solitaire was declared the winner of the contest and its unusual layout attracted a great deal of attention. For a time in the 1980s the aircraft was available as plans and as a kit.
The Briegleb BG-7 is an American strut-braced high-wing, single seat glider that was designed by William G. Briegleb and produced by the Sailplane Corporation of America as a completed aircraft and also as a kit.
The Schreder Airmate HP-11 is an American mid-wing, V-tailed, single seat glider designed by Richard Schreder. Airmate was the name of Schreder's design company.
Alisport srl is an Italian aircraft manufacturer based in Cremella. The company specializes in the design and manufacture of light aircraft and sailplanes in the form of kits for amateur construction and ready-to-fly aircraft for the European Fédération Aéronautique Internationale microlight category, as well as aircraft propellers.
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