A HUB ADAPTOR FOR CONNECTING A WIND TURBINE BLADE TO A ROTOR HUB

A rotor hub adaptor for a wind turbine, comprising a body that defines a central axis and is configured with first connection means for connecting to a hub bearing of a wind turbine rotor hub and second connection means for connecting to a root section of a wind turbine blade. The first connection means defines a first pitch circle diameter and the second connection means defines a second pitch circle diameter, wherein the first pitch circle diameter is different to the second pitch circle diameter. The rotor hub adaptor defines, at the first pitch circle diameter, a first thickness along the axial direction, and further defines, at the second pitch circle diameter, a second thickness along the axial direction, wherein the second thickness is less than the first thickness, such that the rotor hub adaptor is more flexible at the second connection means than at the first connection means. A benefit of the invention is that hub adaptor allows blades having a root diameter different to the corresponding hub bearing diameter to be mated together. However, the flexibility inherent in the reduced thickness at the second connection means has the advantage of improving the reliability of the connection between the blade and the hub.