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The Transition rig changes shape according to conditions -
extending fully in light winds and becoming more sweptback and flexed in stronger winds.
This means that the sail can be used over a wider wind range - it is more adaptable. After
use, the rig can be folded away without the need to dismantle. This concept has been patented. There
is now a web site dedicated to the Transition Rig - please visit www.transitionrig.com
to follow progress with this project after you have taken a look at this
review...
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The concept is applicable to all types of sailing craft. Sailboards
provide an ideal starting point: you can feel the forces at work directly (through your
arms!) when sailing. A dinghy version has been made and is
undergoing trials. |
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 | mast |
The mast has three main segments connected by joints. The two elements forming
the middle segment ensure that the movements of extension and flexion are co-ordinated. A
side-to-side rotation of the middle elements provides the correct change in aerofoil when
changing tack. With the tensioner released, the mast can be folded. |
 
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| joints |
The main joint elements are made from glass- or 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. |
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| boom |
A wishbone boom arrangement is used. |
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| sail |
To adapt to changes in mast shape, the sailcloth has to be stretchable. On the
other hand, it is important that the sail maintains a taut and efficient foil shape
without becoming baggy or wrinkled in different configurations. To date this has proved to
be the most complex aspect of this design. The cloth currently being used is a knitted
nylon mesh coated with polyurethane. |
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