14 Photos - Sep 24, 2007
Photo: KONA is the name.
For more information about the KONA board check out http://english.konaFinland.comPhoto: Note the relatively high skin tension and the pronounced camber (and this is still a RAF sail)Photo: The batten above the boom is tensioned a lot.Photo: The batten at the boom. Please note how much you need to tension the battens to achieve sufficient skin tension and depth of the draft.Photo: Photo: A deep belly produces lots of grunt in light winds, and the skin tension created by "overtensioning" the battens make the sail twist correctly. Rikard Almquist at La Ciotat.Photo: Sail of event winner at Worlds 2007 in La Ciotat. Cannot be all wrong...Photo: Patrice Belbeoch has rigged his 9.0 sail for the worlds.Photo: Notice how he batten protrudes from the sail surface thanks to batten tension.Photo: And the foot batten should also be tensioned, a lot.Photo: The KONA OD 7.4 with regular batten tension.Photo: The KONA OD 7.4 with a lot of batten tension, as advised by the experts (sail designer). By adding batten tension the skin tension increases very significantly, and the feeling of the sail changes from a "soft freestyle sail feel" to a "stiffish fixed camber sail that rotates with a bang"Photo: A lot of batten tension produces a lot of belly. It seems as when the skin tension, and the general tension of the sail, increases then the twist starts to work as designed. The mid leach does not bulge anymore, instead the top twists off in the gusts.Photo: This picture shows how a KONA OD sail with normal batten tension doesn't twist from the head, but instead opens up at the mid leach (battens 3 and 4 from the top). This is corrected by overtensioning the lower 3 battens whereby the leach tension increases, the sail reacts properly to pumping, and the head twists of as it is supposed to.