The asymmetrical spis are used in race on boats having a very good capacity of acceleration which justifies the increase in roads of these spis which sail between 100 and 150° of the real wind. One finds these spis on the 747, Melges 24, J80 and minis 650 and other fast boats. Just like the symmetrical spis, these spis must also be drawn according to the use and of the characteristics of the boats for which they are intended.