Risø's Design Basis for Small to Medium Size Danish Windmills

The report presents a simple design basis for Danish windmills. The design basis has beeen developed in connection with the licensing of windmills at the Test Station. The back-tground for the development of the design basis is outlined, and the design load cases are defined. The load cases are applicable in the condition that a number of functional requirements are fulfillled, and these requirements are specified.

Finally, the impact of the design basis on the development of windmill failure rates and performances is outlined.