I just got word that my 56 cruising cat Sarabi broke her Forespar Aerorig. They are safe at Richmond, CA. I should find out a lot more soon. I would have expected a carbon unstayes mast failure as close to impossible.
I have not heard back again yet so still only guessing but I can only think of a couple of possible scenarios.
One is the roller furling system. I recall they often had trouble with it. What if it bound up in a gust and the sheet was not blown in time?
Many years ago I was an expert witness in a case against Forespar for a really unnecessary mast failure. In deposition they declared that they never follow the design documents; they do it their own way. What if they freestyled this one too?