More seriously, the sail developed by three of the Tornado teams before the last olympics was a gennaker usable upwind in low wind (up to 10 knots). This sail was smaller than the regular tornado spi (7 m2 smaller according to Booth) and way way flatter. I'm assuming this sail was respecting the 75% rule.
Why has nobody tried one of those in the F18 class yet? I can imagine this could help quite a lot in low wind condition...
Also I can't remember how they called it? Chupasomething?
