Method for determining the angle of a rotor blade pertaining to a wind energy installation

A method of adjusting the blade angle of a plurality of rotor blades in a wind power installation comprising:

• using a spacing measuring device to measure the spacing between a first rotor blade and the spacing measuring device, and between a second rotor blade and the spacing measuring device;
• processing the measurements in a computer to calculate a first angle for the first rotor blade and a second angle for the second rotor blade, the first angle being the angle between the first rotor blade and the spacing measuring device and the second angle being the angle between the second rotor blade and the spacing measuring device;
• comparing the first angle of the first rotor blade to the second angle of the second rotor blade;
• and
• changing the first angle, if necessary, so that the first angle of the first rotor blade is equal to the second angle of the second rotor blade.

A method of determining the angle between a rotor blade and a spacing measuring device, comprising:

• measuring the spacing between the rotor blade and the spacing measuring device at defined position at a first location on the blade;
• measuring the spacing between the rotor blade and the spacing measuring device at each of a plurality of subsequent locations on the blade, each of the subsequent locations being at sequentially increasing distance from the first location on the blade;
• and
• determining the angle of the rotor blade with respect to the spacing measuring device based on the measured spacing.