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PANSAIL is an advanced vortex-lattice code that has many new features
leading to improved accuracy of results for even a small number of panels
and has been optimized for use in the design and analysis of yacht sails.
PANSAIL is able to calculate the pressure distribution on either side of
a thin surface so that a boundary layer calculation can be performed to
predict the viscous drag on the sail and the onset of flow separation and
lift loss.
Wakes can be shed from the leech and foot of any sail, and a wake roll-up
calculation is used to give an accurate estimation of sail loads.
PANSAIL has been integrated with the structural analysis code
RELAX (written by Peter Heppel) to give a truly coupled system that
can predict the flying shape of a sail in response to sheet tensions, mold
layups, etc - in fact PANSAIL/RELAX allows the user to
effectively sail his rig via the keyboard, and investigate the effects
of different sail trims.
RELAX has a large customer base, including many America's Cup
teams as well as sail lofts as can be seen from the following external links:
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