S825 and S826 Airfoils: 1994--1995

Research output: NRELSubcontract Report


A family of airfoils, the S825 and S826, for 20- to 40-meter, variable-speed and variable-pitch (toward feather), horizontal-axis wind turbines has been designed and analyzed theoretically. The two primary objectives of high maximum lift, insensitive to roughness, and low profile drag have been achieved. The constraints on the pitching moments and the airfoil thicknesses have been satisfied. Theairfoils should exhibit docile stalls.
Original languageAmerican English
Number of pages67
StatePublished - 2005

Bibliographical note

Work performed by Airfoils, Inc., State College, Pennsylvania

NREL Publication Number

  • NREL/SR-500-36344


  • airfoil design
  • airfoils
  • Pennsylvania State University
  • wind energy
  • wind turbine


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