Speed diagram of a fast foiling sailboat
Résumé
Flying multihulls are now capable of sailing much faster than the wind in all directions, so they are in fact sailing always close to the apparent wind. We will discuss some of the consequences of these high speeds and in particular: (i) the existence of a hysteresis cycle with two very different speeds for the same wind and heading conditions, (ii) transformations in the polar diagram which gives the boat speed in all sailing directions, (iii) the possibility of having no to ease but to trim in the sails during a bear-away and (iv) the effect of the atmospheric boundary layer on the twist angle of the sails of fast boats.
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