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|Duo Discus T flying over the ridges of Pennsylvania, US|
|Role||Two Seater-class sailplane|
|Number built||Over 500|
The Schempp-Hirth Duo Discus is a high-performance two-seat glider primarily designed for fast cross-country flying, including gliding competitions. It is often used for advanced training.
A glider or sailplane is a type of glider aircraft used in the leisure activity and sport of gliding. This unpowered aircraft uses naturally occurring currents of rising air in the atmosphere to remain airborne. Gliders are aerodynamically streamlined and are capable of gaining altitude and remaining airborne, and maintaining forward motion.
Cross-country flying is a type of distance flying which is performed in a powered aircraft on legs over a given distance and in operations between two points using navigational techniques; and an unpowered aircraft by using upcurrents to gain altitude for extended flying time. Cross country is distinct from purely aerial work in a small defined area requiring little navigation.
Gliding is a recreational activity and competitive air sport in which pilots fly unpowered aircraft known as gliders or sailplanes using naturally occurring currents of rising air in the atmosphere to remain airborne. The word soaring is also used for the sport.
The Duo Discus replaced the Janus as Schempp Hirth's high-performance two-seater trainer. Although it shares its name with the highly successful Standard Class Discus, any resemblance is only superficial. It first flew in 1993 and is still in production at the factory in Orlican in the Czech Republic. It has a 20-metre four-piece wing that is slightly swept forward so that the rear pilot is close to the centre of gravity. Its best glide ratio was measured as 44:1. An optional 'turbo' retractable two-stroke engine can be specified for extended gliding sessions. Over 500 Duo Discuses had been built by August 2007. Its chief rival is now the DG Flugzeugbau DG-1001. In U.S. Air Force service it is known as the TG-15A.
The Schempp-Hirth Janus is a high performance two-seat glider that was built by Schempp-Hirth GmbH.
The Schempp-Hirth Discus is a Standard Class glider designed by Schempp-Hirth. It was produced in Germany between 1984 and 1995 but has continued in production in the Czech Republic. It replaced the Standard Cirrus. It was designed by Klaus Holighaus.
The Czech Republic, also known by its short-form name, Czechia, is a landlocked country in Central Europe bordered by Germany to the west, Austria to the south, Slovakia to the east and Poland to the northeast. The Czech Republic covers an area of 78,866 square kilometres (30,450 sq mi) with a mostly temperate continental climate and oceanic climate. It is a unitary parliamentary republic, with 10.6 million inhabitants; its capital and largest city is Prague, with 1.3 million residents. Other major cities are Brno, Ostrava, Olomouc and Pilsen. The Czech Republic is a member of the European Union (EU), NATO, the OECD, the United Nations, the OSCE, and the Council of Europe.
A revised model the Duo Discus X was announced in 2005. This has landing flaps incorporated into the movement of the airbrake lever to improve its approach control, giving steeper and slower approaches, it also has winglets to improve thermal flying and a sprung and lower retractable undercarriage. This makes it slightly harder to get in because the distance between the cockpit and ground is increased, but the wings have a slightly higher angle of attack.
The Duo Discus XL is the latest version. It shares the same fuselage as the Schempp-Hirth Arcus and the Schempp-Hirth Nimbus 4D. The cockpit is now 10 cm longer to improve seat comfort, security, space and ergonomics. The airbrake system has been moved 4 cm towards the leading edge and now extends 18mm higher. The XL is certified for simple aerobatics, including spinning. It can also be flown entirely from the back seat.
The Schempp-Hirth Arcus is a flapped Two Seater Class glider in production by Schempp-Hirth. It first flew 7 April 2009. It is offered in addition to the Duo Discus which is an unflapped 20 metre two-seater, whose fuselage it shares. The wings have flaperons integrated along the whole span.
The Schempp-Hirth Nimbus-4 is a family of high-performance FAI Open Class gliders designed by Klaus Holighaus and manufactured by Schempp-Hirth Flugzeugbau GmbH in Kirchheim, Germany. The Nimbus-4 first flew in 1990.
The Advanced Soaring Concepts Falcon, also called the Advanced Soaring Concepts American Falcon, is an American mid-wing, T-tailed, single-seat, FAI 15-Metre Class glider that was designed by Tor Jensen and produced by Advanced Soaring Concepts in the mid-1990s. The aircraft was produced as a kit for amateur construction.
The Schempp-Hirth Discus-2 is a Standard Class sailplane produced by Schempp-Hirth since 1998. It replaced the highly successful Schempp-Hirth Discus.
The Schempp-Hirth Ventus is a sailplane produced during 1980–1994 by Schempp-Hirth, a German sailplane manufacturer. It was designed by Klaus Holighaus and replaced the Schempp-Hirth Mini-Nimbus. Schempp-Hirth manufactured 613 Ventus sailplanes.
The Glaser-Dirks DG-200 is a 15 metre class glider built by Glaser-Dirks. It first flew in 1977. Wingtip extensions to 17 metres were offered in 1978. Later enhancements included a single-piece canopy, a carbon-fibre wing spar and a change in the wing profile. A total of 192 DG-200 were built.
The Schempp-Hirth Mini Nimbus is a 15 Metre-class glider designed and built by Schempp-Hirth GmbH in the late 1970s.
The Schempp-Hirth Cirrus is an Open Class glider built by Schempp-Hirth between 1967 and 1971 and by VTC until 1977.
The Schempp-Hirth HS-3 Nimbus was a prototype glider built by Klaus Holighaus.
The Schempp-Hirth Nimbus-2 is an Open Class glider built by Schempp-Hirth during the 1970s. The Nimbus-2 first flew in April 1971 and a total of over 240 examples of all subtypes have been built until the beginning of the 1980s.
The Rolladen-Schneider LS9 is an 18 metre single-seat motor glider launched in 2000 by Rolladen-Schneider. Production ended after just 10 gliders were built, when Rolladen-Schneider went into receivership.
The ASW 28 is a Standard Class glider with a fifteen-metre span built of modern fibre reinforced composites. The manufacturer of the ASW-28 is Alexander Schleicher GmbH & Co. The 'W' indicates this is a design of the influential and prolific German designer Gerhard Waibel. Serial production started in 2000.
The Glaser-Dirks DG-300 is a Standard Class single-seat high-performance glider built of glass-reinforced plastic. The DG-300 was designed by Wilhelm Dirks and manufactured by Glaser-Dirks Flugzeugbau's Slovenian partner company Elan (company). A total of 511 of all versions were built since production started in 1983. Representative contemporary types from competing manufacturers are the Rolladen-Schneider LS4 and the Schempp-Hirth Discus.
The PZL Bielsko SZD-55 Nexus is a Standard Class sailplane produced by PZL Bielsko since 1988. It was built in direct competition with the Schempp-Hirth Discus. The SZD-55 is still in production with approximately 110 built.
The Glaser-Dirks DG-500, and later the DG-505, is a two-seat glider of glass-reinforced plastic and carbon fiber reinforced plastic construction, manufactured in the DG Flugzeugbau GmbH in Bruchsal, Germany.
The Schleicher ASW 17 is a single-seat Open Class sailplane that was built by the German manufacturer Alexander Schleicher GmbH & Co. It was also known as one of the Super Orchidees.
The Standard Austria was a single-seat aerobatic glider that was originally designed and built in Austria from 1959 but production was moved in 1962 to Schempp-Hirth in Germany.
The Schempp-Hirth SHK Open Class glider was developed in Germany by Schempp-Hirth. It was based on the 1964 version of the Standard Austria, known as the SH. The Austria was originally a single-seat aerobatic glider that had been designed and built in Austria from 1959 but production was moved in 1962 to the Schempp-Hirth factory in Germany.
The Wassmer WA 26 Squale is a single seat, 15 m (49 ft 3 in) span competition glider, designed and produced in France in the late 1960s. It has wooden wings and a glass fibre fuselage. The Wassmer WA 28 Espadon is an aerodynamically very similar development with a glass fibre wing.
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