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Evolution of Airfoils for Sailplanes

Horstmann, K.H. und Boermans, L.M.M. (2003) Evolution of Airfoils for Sailplanes. AIAA/ICAS International Air & Space Symposium and Exposition, Dayton (usa), 14.-17.07.2003.

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Kurzfassung

About 110 years ago O. Lilienthal built his gliders with cambered plate wings which were stiffened out by a plenty of strut wires. Analysis of this type of airfoils show their narrow range of angles of attack and their rapid loss of lift at stall conditions. The development of the thick airfoils of the Göttingen series led to the construction of the Vampyr with a strut free wing and a torsion leading edge box. The quality of the surface and the maximum thickness close to the leading edge did not allow reasonable extent of laminar flow. The big advantages of laminar flow airfoils have been discovered in the late thirties and have been systematically investigated by the NACA. But only the combination of an airfoil designed for laminar flow and the excellent surface quality of a sandwich construction of glass fibre reinforced plastics and solid foam made the big success of laminar airfoils for sailplanes possible. This is shown by way of the example of the Ka 6 and the Phönix. Examples of typical airfoils demonstrate further developments: Airfoils without and with flaps; problem of laminar separation bubbles, use of destabilisation zones and use of turbulators. An attempt to assess future possibilities for performance improvements of sailplanes closed the paper.

Dokumentart:Konferenzbeitrag (Paper)
Zusätzliche Informationen: LIDO-Berichtsjahr=2004,
Titel:Evolution of Airfoils for Sailplanes
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Horstmann, K.H.NICHT SPEZIFIZIERT
Boermans, L.M.M.Delft University of Technology, Netherlands
Datum:2003
Status:veröffentlicht
Veranstaltungstitel:AIAA/ICAS International Air & Space Symposium and Exposition, Dayton (usa), 14.-17.07.2003
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Luftfahrt
HGF - Programmthema:Starrflügler
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AR - Starrflüglerforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Flugphysik
Standort: Köln-Porz , Braunschweig , Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik
Hinterlegt von: Claudia Grant
Hinterlegt am:31 Jan 2006
Letzte Änderung:14 Jan 2010 19:30

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