Hi,
that problem is probably caused by too much/ less power on the dolphin striker. Sailing in more waves might have caused the acutal cracks. For safety reasons immediately replace the beam. You may ask for used parts under
www.sportmohr.de That is the German dealer who may send you some parts.
We had those problems with a couple of boats in the late 80s, most of them had changed the dolphin striker tension.
Have fun, hand deeper and sail faster!
Fritz, a German living in Virginia Beach, USA
HC 16 and
HC TIGER