Doing just a quick google search, I found a survey listed online for a 311 where the surveyor noted the lack of knees and strengthening at the chain-plates - although as Watercaymen points out, I doubt with the headliner he could have really seen if there was additional fiberglass in that area: http://www.boatsurveyor.net/im_imag...urvey_Beneteau_Oceanis_311_sailing_vessel.pdf
Since it lasted until now, my guess is that it may have been a few things that all aligned at once (Speculation, but I can't help it):
- Maybe a little less laminate when built then called for, but who knows
- Maybe someone just before or after the sale "tuned" the rig and tightened the hell out of it
- Maybe he was sailing in conditions that the previous owner hadn't, even though it wasn't exactly heavy conditions.
Since it lasted until now, my guess is that it may have been a few things that all aligned at once (Speculation, but I can't help it):
- Maybe a little less laminate when built then called for, but who knows
- Maybe someone just before or after the sale "tuned" the rig and tightened the hell out of it
- Maybe he was sailing in conditions that the previous owner hadn't, even though it wasn't exactly heavy conditions.