S819, S820, and S821 Airfoils: October 1992--November 1993

Research output: NRELSubcontract Report


A family of thick airfoils for 10- to 20-meter, stall regulated, horizontal-axis wind turbines, the S819, S820, and S821, has been designed and analyzed theoretically. The primary objectives of restrained maximum lift, insensitive tro roughness, and low profile drag have been achieved. The constraints on the pitching moments and airfoil thicknesses have been satisfied.
Original languageAmerican English
Number of pages53
StatePublished - 2005

Bibliographical note

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

NREL Publication Number

  • NREL/SR-500-36334


  • airfoils
  • design
  • horizontal-axis wind turbines (HAWT)
  • S819, S820, AND S821


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