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Wright Glider
The Wright brothers designed, built and flew a series of three manned gliders in 1900–1902 as they worked towards achieving powered flight. They also made preliminary tests with a kite in 1899. In 1911 Orville conducted tests with a much more sophisticated glider. Neither the kite nor any of the gliders were preserved, but replicas of all have been built.
The 1899 kite, which Wilbur flew near his home in Dayton, Ohio had a wingspan of only 5 feet (1.5 m). This pine wood and shellacked craft, although too small to carry a pilot, tested the concept of wing-warping for roll control that would prove essential to the brothers' solving the problem of controlled flight. The Wrights burned the craft along with other trash in 1905.
The 1900 Wright Glider was the brothers' first to be capable of carrying a human. Its overall structure was based on Octave Chanute's two-surface glider of 1896. Its wing airfoil was derived from Otto Lilienthal's published tables of aerodynamic lift. The glider was designed with wing-warping capability for full-size testing of the concept first tried on the 1899 Wright Kite.
On 23 September 1900, Wilbur wrote from Kitty Hawk, "My idea is merely to experiment and practice with a view to solving the problem of equilibrium. When once a machine is under proper control under all conditions, the motor problem will be quickly solved. I am constructing my machine to sustain about five times my weight...trussed like a bridge." Weighing 52 pounds (24 kg), the glider had a wingspan of 17.5 feet (5.3 m), a wing area of 155 square feet (14.4 m2), while the wings were curved with a ratio of 1-in-22. In 1924, Orville wrote, "...we retained the elevator in front for many years because it absolutely prevented a nose dive such as that in which Lilienthal and many others since have met their deaths." Harry B. Combs noted, "...because the elevator was forward instead of behind, the aircraft, when it stalled, instead of spinning out and killing them the way a conventional aircraft would have done, simply parachuted to the ground in a flat position. The forward elevator also served as a visual indicator of the airplane's attitude in flight." The flyer would operate the craft from a prone position on the bottom wing, so as to reduce wind resistance.
The glider was first flown as an unmanned kite on October 5, 1900 near Kitty Hawk, North Carolina. Next, Wilbur rode as pilot while men on the ground held tether ropes attached to the airborne craft. Subsequently, Wilbur made about a dozen free flights on a single day, concluding the season's test efforts. The brothers abandoned the glider when they broke camp on 23 October, and it eventually disappeared in the region's severe storms. The fabric covering of the wing components was given to the wife of helper Bill Tate, whose family Wilbur first stayed with at Kitty Hawk in 1900. Mrs. Tate allegedly used the material to make dresses for her daughters.
Afterwards, Wilbur wrote, "longitudinal balancing and steering were effected by means of a horizontal rudder projecting in front of the planes. Lateral balancing and right and left steering were obtained by increasing the inclination of the wings at one end and decreasing their inclination at the other." The brothers had demonstrated two thirds of the eventual three-dimension control system (the glider did not possess a vertical rudder).
The 1901 Wright Glider was the second of the brothers' experimental gliders. They tested it over the Kill Devil Hills, four miles south of Kitty Hawk. The glider was similar to the 1900 version, but had larger wings. It first flew on July 27, 1901, and was retired on August 17. During this time it made between 50 and 100 free flights, in addition to tethered flights as a kite.
Operating from Big Kill Devil Hill once again, the new glider now had a 22 feet (6.7 m) wingspan, a chord of 7 feet (2.1 m), a wing area of 290 square feet (27 m2), and weighed 98 pounds (44 kg). However, the camber was increased to a ratio of 1-in-12, with a blunt edge. This new wing design required Wilbur to apply full elevator deflection to get the glider flying, and Wilbur encountered stalls for the first time. However, the forward placement of the elevator allowed the glider the descend in a floating manner, rather than fall off into a spin. Wilbur noted that with light winds, "the center of pressure was in front of the center of gravity," while with increasing wind speed, the center of pressure moved aft, until with strong winds, "the center of pressure had reached a point even behind the center of gravity." This discovery led the brothers to reduce the wing depth of curvature. Wilbur noted that with the modification, "...we made glide after glide, sometimes following the ground closely, and sometimes sailing in the air." They also measured pressure at various angles of incidence, and noted the pressure was not at a right angle to the chord as expected, but inclined forward, overcoming structural resistance as well as generating lift. Yet the measured lift was only one third of what they had calculated it should be. That led them to doubt the Smeaton coefficient used to compute that lift, and to doubt the calculations made by Otto Lilienthal and Samuel Langley. The glider was also used to initiate a turn using wing-warping, which led to a surprise. Wilbur noted that the, "Upturned wing seems to fall behind, but at first rises." This would require a third means of controlling the glider, besides wing-warping and elevator deflection.
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Wright Glider
The Wright brothers designed, built and flew a series of three manned gliders in 1900–1902 as they worked towards achieving powered flight. They also made preliminary tests with a kite in 1899. In 1911 Orville conducted tests with a much more sophisticated glider. Neither the kite nor any of the gliders were preserved, but replicas of all have been built.
The 1899 kite, which Wilbur flew near his home in Dayton, Ohio had a wingspan of only 5 feet (1.5 m). This pine wood and shellacked craft, although too small to carry a pilot, tested the concept of wing-warping for roll control that would prove essential to the brothers' solving the problem of controlled flight. The Wrights burned the craft along with other trash in 1905.
The 1900 Wright Glider was the brothers' first to be capable of carrying a human. Its overall structure was based on Octave Chanute's two-surface glider of 1896. Its wing airfoil was derived from Otto Lilienthal's published tables of aerodynamic lift. The glider was designed with wing-warping capability for full-size testing of the concept first tried on the 1899 Wright Kite.
On 23 September 1900, Wilbur wrote from Kitty Hawk, "My idea is merely to experiment and practice with a view to solving the problem of equilibrium. When once a machine is under proper control under all conditions, the motor problem will be quickly solved. I am constructing my machine to sustain about five times my weight...trussed like a bridge." Weighing 52 pounds (24 kg), the glider had a wingspan of 17.5 feet (5.3 m), a wing area of 155 square feet (14.4 m2), while the wings were curved with a ratio of 1-in-22. In 1924, Orville wrote, "...we retained the elevator in front for many years because it absolutely prevented a nose dive such as that in which Lilienthal and many others since have met their deaths." Harry B. Combs noted, "...because the elevator was forward instead of behind, the aircraft, when it stalled, instead of spinning out and killing them the way a conventional aircraft would have done, simply parachuted to the ground in a flat position. The forward elevator also served as a visual indicator of the airplane's attitude in flight." The flyer would operate the craft from a prone position on the bottom wing, so as to reduce wind resistance.
The glider was first flown as an unmanned kite on October 5, 1900 near Kitty Hawk, North Carolina. Next, Wilbur rode as pilot while men on the ground held tether ropes attached to the airborne craft. Subsequently, Wilbur made about a dozen free flights on a single day, concluding the season's test efforts. The brothers abandoned the glider when they broke camp on 23 October, and it eventually disappeared in the region's severe storms. The fabric covering of the wing components was given to the wife of helper Bill Tate, whose family Wilbur first stayed with at Kitty Hawk in 1900. Mrs. Tate allegedly used the material to make dresses for her daughters.
Afterwards, Wilbur wrote, "longitudinal balancing and steering were effected by means of a horizontal rudder projecting in front of the planes. Lateral balancing and right and left steering were obtained by increasing the inclination of the wings at one end and decreasing their inclination at the other." The brothers had demonstrated two thirds of the eventual three-dimension control system (the glider did not possess a vertical rudder).
The 1901 Wright Glider was the second of the brothers' experimental gliders. They tested it over the Kill Devil Hills, four miles south of Kitty Hawk. The glider was similar to the 1900 version, but had larger wings. It first flew on July 27, 1901, and was retired on August 17. During this time it made between 50 and 100 free flights, in addition to tethered flights as a kite.
Operating from Big Kill Devil Hill once again, the new glider now had a 22 feet (6.7 m) wingspan, a chord of 7 feet (2.1 m), a wing area of 290 square feet (27 m2), and weighed 98 pounds (44 kg). However, the camber was increased to a ratio of 1-in-12, with a blunt edge. This new wing design required Wilbur to apply full elevator deflection to get the glider flying, and Wilbur encountered stalls for the first time. However, the forward placement of the elevator allowed the glider the descend in a floating manner, rather than fall off into a spin. Wilbur noted that with light winds, "the center of pressure was in front of the center of gravity," while with increasing wind speed, the center of pressure moved aft, until with strong winds, "the center of pressure had reached a point even behind the center of gravity." This discovery led the brothers to reduce the wing depth of curvature. Wilbur noted that with the modification, "...we made glide after glide, sometimes following the ground closely, and sometimes sailing in the air." They also measured pressure at various angles of incidence, and noted the pressure was not at a right angle to the chord as expected, but inclined forward, overcoming structural resistance as well as generating lift. Yet the measured lift was only one third of what they had calculated it should be. That led them to doubt the Smeaton coefficient used to compute that lift, and to doubt the calculations made by Otto Lilienthal and Samuel Langley. The glider was also used to initiate a turn using wing-warping, which led to a surprise. Wilbur noted that the, "Upturned wing seems to fall behind, but at first rises." This would require a third means of controlling the glider, besides wing-warping and elevator deflection.