Transition Rig - pronation/supination
Channel: Richard Dryden
Date: 2017-02-10

This illustrates a rotational movement of mast segments that occurs within some versions of the Transition Rig when changing from tack to tack. It ensures that the lower half of the sail takes on the correct aerodynamic shape. Because this movement resembles the rotation of the radius and ulna in the forearm, I refer to it as pronation and supination.