Blade for a wind turbine and connection method for connecting said blade to a hub of said wind turbine

A wind blade for a wind turbine, the blade comprising:

• a tip;
• and
• a root,
• wherein the blade extends along a first longitudinal axis from the tip to the root,
• wherein the root is suitable for attachment to a hub of a wind turbine,
• wherein the root has a tubular shape and a defining a crown extending around the first longitudinal axis,
• wherein the crown has a plurality of first connection openings that are spaced apart along the crown,
• wherein each first opening extends along a direction substantially parallel to the first longitudinal axis or a direction longitudinal to the extension of the blade, and
• wherein each first opening has an inner surface defining a first helical coupling portion which develops helically to accommodate and allow attaching by screwing a connecting device suitable to attach the root of the blade to the hub.