• mast

The mast has three main segments connected by joints.

The two struts forming the middle segment ensure that the movements of extension and flexion are co-ordinated at upper and lower joints. A side-to-side rotation of the middle elements provides the correct change in aerofoil in the lower part of the sail when changing tack. With the tensioner released, the mast can be folded.

• joints

The main joint elements are made from carbon-reinforced epoxy resin with thin metal restraining straps. They are modelled on biological joints and use joint surfaces with large surface areas and concavo-convex profiles for stability and load distribution - they experience heavy twisting forces when the sail is powered up..

Click here for more about joints...

• boom

A standard wishbone boom is used.