Arcs are a new form of traction kite developed for kite
surfing and kite sailing but also useful for buggying and other power
kiting activities.
Their basic constructional form is of a parafoil style kite without bridles,
the flying lines being attached directly and only to the wing tips.
Their shape while flying is an arch, hence the name Arc, and
this arch, viewed from front and rear, is almost exactly semicircular.
All current models are also of the closed foil type, with air entry
by tubular fabric non-return valves along the leading edge. These valves
prevent air escaping and resist water entry even when the partially
immersed. When floating, the Arc's considerable volume (much greater
than for single skin inflated tube kites) cause them to drift downwind
faster than a semi immersed person. This keeps the kite's lines under
tension, a must for relaunching from deep water.
Water relaunchability is possible from any position and in light
winds.
Stability,
For some as yet inadequately explained reason, Arcs are very stable.
Luffing almost impossible. Apart from broken tip struts (rare), tip
or shoulder collapses caused by under-inflation are about the only problems.
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