>Beyond being exceptionally tall — more than 40 feet higher than the original foremast — it was also very heavy, at least 24 tons of aluminum, possibly more.<p>the yacht is 500 ton, 4m draught (with the retractable keel not extended). The mast is 72m height. So, the 24 tons at say 30m above center of buoyancy require - minimum - 240 ton at 3m below the center of buoyancy. Add to that that the center of buoyancy is inside the body at some depth under the deck, so the weight of the body above the center of buoyancy also needs corresponding weight (lever momentum, ie. mass x lever length) below the center of buoyancy. Doesn't look good.