The other day my wishbone broke suddenly when I was nicely powered up with 7.8 in some 15 knots. Water was rather flat so no particular shock that I can remember. It is a Nautix aluminium boom that I've been using for about seven years, mostly freeracing with sails bigger than 6. The inner tube (protruding from the head) is cut without signs of previous damage or rust. Can it be just stress and strain? I wonder because I'm relatively light (67 Kg) so I can't load it tremendously. Did any of you experience a similar thing?