Ezzy basic sail design theory kevin pritchard on the panther elite on any given sunny or wickedly stormy day, when we step our feet onto our sailboards and with our booms in our grasp, sheet in, and the wind fills our sails, we start to move. leaning out over the water, our eyes look ahead. we search for bumps to jump or smooth spots to glide. When the boat sails "into the wind", the bow is pointed into the apparent wind, which is the vector resolution of the true wind and the boat course. the sail in the wind acts as an airfoil and the hull in the water acts as a hydrofoil, so there are two sets of forces acting on a sailboat: aerodynamic and hydrodynamic. There are actually a number of interesting things at play here. first and foremost, anything with sail design involves tradeoffs. speed versus drag, acceleration vs top speed potential, theoretical performance vs ease of trim (and therefore ability to get to max theoretical performance), etc..
From the beginning of sail design, intuition and experience have been the primary means of designing sails. intuition and experience still play a major role in sail design because presently no database exists to tell a sailboat designer what sail will work best with a given hull shape!. Stability, fundamentally, is what prevents a boat from being turned over and capsized. whether you are a cruiser or a racer, it is a desirable characteristic. a boat's shape, particularly its transverse hull form, has an enormous impact on how stable it is. this so-called "form stability" is one of. Sailing theory a . y. r. s. publi c at i 0 n no. 31 tamu mostly concerned with the practical application of the theory of sailing to the design of yachts as well as their handling. the field covered here has never been quite so well covered before and i feel that this publication is one of exceptional merit and value to yachtsmen. to deal with both the theory and practice of sailing in.
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