Windmill Sail

The Windmill Sail is a component added by Immersive Engineering. It is used in the improvement of a Windmill, by right clicking on the Windmill hub. This covers one blade in the sail, which makes the windmill spin a bit faster per sail, generating more power. You need 8 sails total to improve the windmill to full power.

Before Immersive Engineering version 0.12-92, this was the Improved Windmill Blade which was used to craft an Improved Windmill.