This is quite an interesting point. My Carbon mast had a tip weight of 5.25kgs. Therefore, I added 750grams of lead to measure prior to racing at the Global Challenge. I heard that Hans's Carbon masts had a tip weight of exactly 6kgs. The Stealths center boards were also lighter than Hans's and yet the Blade had an all up weight of under 104kgs and the Stealths was 112kgs. How come Hans's Blade appears to be lighter than most other Blades and approx 4kgs per hull lighter than the Stealth's?
As for carrying crew weight singlehanded the Global challenge proved that F16's have an enormous competitive range anything from 73kgs (Me, Stealth) to over 120kgs (Marcus, Aus Blade). Although, the winner (Hans, VWM Blade) was 90kgs.