Editing Coupling (section)

=== Elastic ===
[[File:Windsurfing equipment 2008 46.jpg|thumb|An elastic coupling (for connecting a [[windsurfing]] sail rig to the board)]]
An elastic coupling transmits torque or other load by means of an elastic component. One example is the coupling used to join a [[windsurfing]] rig (sail, mast, and components) to the sailboard.<ref>{{cite web|url=http://www.unifiber.net/2015/blog/2015/03/review-windsurf-uj-types/|title=Review of Windsurf Universal Joint Types – 'Your Ride, Our Gear'|website=Unifiber.net|access-date=28 November 2018}}</ref> In windsurfing terminology it is usually called a "universal joint", but modern designs are usually based on a strong flexible material, and better technically described as an elastic coupling. They can be tendon or hourglass-shaped, and are constructed of a strong and durable elastic material. In this application, the coupling does not transmit torque, but instead transmits sail-power to the board, creating [[thrust]] (some portion of sail-power is also transmitted through the rider's body).{{Citation needed|date=July 2022}}
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