choco said...

Do the sails on these moths(video) rig and de-rig like windsurfing sails?

The sails on the Moths are more like landyacht sails, designed for a higher speed than conventional water yacht sails, sail board sails are quite a bit different again because of the boom set up.

A land yacht with an unstayed mast (Class5, Mini and Blokart) use the mast flex to control the sail shape, and in effect have an "active" system that changes with the sheeting.
Most small water yachts and sailboards tend to set the sail up on the beach to suit the "expected" wind conditions and from that point doesn't change much. There are some classes that use a flexible mast that changes while sailing, those being the Finn, OK Dinghy and to a lesser extent the Laser.