Originally Posted by andyxs
Didnt it have something to do with the structural design and taking a runner to the wrong winch (as the right one had spat its cogs) thus loading structure in a manner to which it wasn't designed, runner loads can be huge!
Actually not - you are referring to another well known failure (on a NZ boat). Ian Murray the boats designer was on the runners at the time of this failure and he confirmed all positions / loads on the runners were correct. The boats were racing in 20+ knots of breeze in lumpy swell and as they came off a big wave the failure happened (with a big bang.) This incident caused the introduction of wind speed limits - it was recognised that all these boats were designed to very fine limits. (Like in F1 where cars engines have been restricted the AC organisers realised that there had to be wind limits).
The irony is this - the saying goes that in history man learns nothing from history. In the latest Americas Cup one boat failed and a well known GB sailor was trapped and killed. After that lower wind limits were then introduced. Although this is open to criticism no one had foreseen how fast the foiling boats would go. The lower wind limit was intended to try to limit the boast speed below 50kts (where extreme cavitation issues were coming to the fore).