Peter,
Were they new rudders ? If so is Jim going to replace them ?
It just doesn't seem right that rudders can be designed that fail under normal loading. <img src="http://www.catsailor.com/forums/images/graemlins/confused.gif" alt="" /> They should be able to take double the normal loading.
Deflection testing on production samples should have demonstrated the strength.
Regards,
Peter