Analysis and Comparison of Test Results from the Small Wind Research Turbine Test Project: Preprint

Research output: Contribution to conferencePaper


Most small wind turbines furl (yaw or tilt out of the wind) as a means of limiting power and rotor speeds in high winds. The Small Wind Research Turbine (SWRT) testing project was initiated in 2003 with the goal of better characterizing both small wind turbine loads (including thrust) and dynamic behavior, specifically as they relate to furling. The main purpose of the testing was to producehigh-quality data sets for model development and validation and to help the wind industry further their understanding of small wind turbine behavior. Testing was conducted on a modified Bergey Excel 10-kW wind turbine. A special shaft sensor was designed to measure shaft loads including thrust, torque, and shaft bending. Analysis of 10-minute mean data showed a strong correlation between furlingand center of thrust location, as calculated from the shaft-bending and thrust measurements. Data were collected for three different turbine configurations that included a change in the lateral furling offset and the blades. An analysis of inflow conditions indicated that organized atmospheric turbulence had some impact on furling.
Original languageAmerican English
Number of pages16
StatePublished - 2004
Event43rd AIAA Aerospace Sciences Meeting and Exhibit - Reno, Nevada
Duration: 10 Jan 200513 Jan 2005


Conference43rd AIAA Aerospace Sciences Meeting and Exhibit
CityReno, Nevada

NREL Publication Number

  • NREL/CP-500-36891


  • Bergey Excel/s-60 turbine
  • small wind research turbine project
  • SWRT
  • wind energy
  • wind turbine


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