I see it difficult for a 18" or even 20" design to be a mixed boat. Mean weight for a man in Europe is about 75 kg? For a woman 55? This would give a combined weight of 130 kg. From my experience on both boats, for a H16 this is perfect, on a Tiger/F18 with the big sails this is not enough (for 15 knots+). Eastern countries even will have difficulties getting up to 130 kg. How can a Tornado or other 20" cats be an option for a mixed crew? If I remember right, optimal weight for the T was around 145? I think it should be easy to get close to ideal weight for a lot of teams, especially young ones!