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Large Biplane Glider
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Otto Lilienthal's Large biplane glider (Großer Doppeldecker) was designed and built in 1895 as an advanced stage of the Lilienthal Normalsegelapparat - a monoplane glider invented by Otto Lilienthal. The Normalsegelapparat, patented in 1893 (US patent from 1895), was the first production aircraft in history. Like its preceding model, the Large Biplane is a hang glider which is controlled through weight shifts by the pilot as hang gliders are to this day.
The objective of the biplane was to increase the wing surface of the monoplane Normalsegelapparat without increasing the wingspan. This would have made controlling the aircraft more difficult as the pilot only had limited range to shift his or her weight in the cockpit. Lilienthal had already upgraded one of his smaller monoplane models - the Sturmflügelmodell - to a smaller biplane that same year. While building the large biplane he made use of this experience. It was one of the many aircraft designs only flown by Lilienthal himself. Countless flights with both biplanes have been photographically documented. Lilienthal flew both gliders from his personal flying hill in Lichterfelde (Berlin). In 1896 he flew the Large Biplane at the Gollenberg near Stölln in Havelland. These two gliders are the first successful man carrying biplanes in history.
The lower deck is the exact same size as the one used in Lilienthal’s patented monoplane glider. The upper deck is not, like the lower one, completely foldable, but folds in the middle. Thus the glider is easily reduced to a transportable width of a little more than two meters. Besides the intent to increase lift, the upper deck also changes the flight mechanical properties in comparison to the monoplane. The aerodynamic center is higher and therefore increases flight stability, but reduces lateral control authority. Lilienthal’s goal was to eventually use stronger winds to achieve long-lasting (gliding) flights.
Data from 
- Crew: One
- Length: 5.30 m (17 ft 5 in)
- Wingspan: 6.70 m (22 ft 0 in)
- Wing area: 24 m2 (260 sq ft)
- Empty weight: 25 kg (55 lb)
- Maximum glide ratio: 4
The original large biplane glider did not survive. However, there are several exemplars of the original monoplane that the biplane was based on. Reconstructions exist in several museums. The reconstruction of a large biplane used for flight testing was possible by means of the patent drawings of the monoplane glider and many detailed photographs of both, the monoplane and the biplane.
An authentic replica of the ‘’Large Biplane’’ made by the Otto Lilienthal Museum have been investigated by the German Aerospace Center (DLR) in flight tests in California and North Carolina. The results proof that the glider was stable in pitch and roll and can be flown safely at moderate altitudes when wind is steady.  
- Nitsch, Stephan. Der Mensch fliegt - Lilienthals Flugversuche in historischen Aufnahmen. Bernard & Graefe Verlag, Koblenz 1988. ISBN 3-7637-5838-0 Search this book on ..
- Schwipps, Werner. Vom Sprung zum Flug (From the jump to the flight). Berlin, Brandenburgisches Verlagshaus, 1991. ISBN 3-327-01090-0 Search this book on .. Modified second edition: Die Flugzeuge von Otto Lilienthal. Technik - Dokumentation - Rekonstruktion. (The airplanes of Otto Lilienthal. Technique - Documentation - Reconstruction). Otto-Lilienthal-Museum Anklam, 2016. ISBN 978-3-941681-88-0 Search this book on ..
- Schwipps, Der Mensch fliegt, S. 161ff
- Nitsch: Die Flugzeuge von Otto Lilienthal. Anklam 2016. ISBN 978-3-941681-88-0 Search this book on .
- [ https://www.dlr.de/content/en/dossiers/2019/lilienthal-glider-project.html] German Aerospace Center Retrieved: 15. Febr. 2020.
- [ https://www.airspacemag.com/daily-planet/more-century-later-lilienthal-and-wright-gliders-fly-together-first-time-kitty-hawk-180973882/] Air & Space/Smithsonian Retrieved: 15. Febr. 2020.
- Raffel, Markus (January 2020). "The Lilienthal Bi-Plane Glider". USHPA Pilot. 50 (1): 18–20.
- The Aeroplane Models of Lilienthal Otto Lilienthal Museum, 2016
- Lilienthal's last flight Otto Lilienthal Museum, 2016
- Remembering the Wright Brothers and Otto Lilienthal The Outer Banks Voice, 2019
- Otto Lilienthal’s Glider to Fly in North Carolina’s Outer Banks State Aviation Journal, 2019
- DLR tests confirm Otto Lilienthal as the first ancestor of all aviators German Aerospace Center, 2016
- The biplanes constructed by Lilienthal and the Wright brothers fly together for the first time German Aerospace Center, 2019
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