SailNet Community - View Single Post - Mooring vs. Slip
View Single Post
  #36  
Old 10-09-2009
PrarieRose PrarieRose is offline
Junior Member
 
Join Date: Apr 2007
Location: Pender Island
Posts: 5
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
PrarieRose is on a distinguished road
Quote:
Originally Posted by Maine Sail View Post
Depending upon your bow roller you probably would have seen a failure mode even sooner. Bow rollers on most boats are not designed for storm force loads.


That picture below caused by a regular old working anchor not even a mooring.

Your pendants failed most likely due to heat fatigue. Any sort of "hose" is a terribly bad idea, and leather is not much better. A woven textile is a far better chafe protector because it allows the pendant to remain wet and cooler as water easily passes through woven materials. This allows cooling and the heat can also escape helping the pendant stay cool and preventing heat fatigue failures. Nylon begins to fail at 300f which is actually easy to reach under the right chafe conditions. Slide down a rope and tell me how quickly heat develops and burns you hands. Now concentrate that heat in one location for hours inside a water proof hose that acts as a heat insulator.

You also want LONG pendants. Sharp angles over a bow chock lead to compression of the pendants fibers generating even more heat at the chock/pendant intersection. A long pendant with a low angle will see considerably less chafe & heat generation than a short one with a steep angle.

This is a good pendant angle:



This is a horrendous pendant angle, plus the anchor will like case a failure too, either way this boat is doomed to a higher potential for failure in a storm:


ALWAYS remove your anchor before storms or anytime it may come in contact with the pendant. This is a fairly new pendant with perhaps a month or two of use in CALM conditions. The anchor has already begun to eat this very expensive Yale Polydine Pendant. Imagine what will happen in a storm.
.
Thanks to everyone for posting better ideas regarding chafe gear. I have certainly changed my materials used for this purpose since the incident two years ago. As far as bow rollers go, mine is a 1'' stainless post horisontally mounted throught a bushing and through a 1/4'' stainless bracket through my bowsprit and 3.5'' bronze rollers. Nothing short of the hand of god is going to bend that. That said, 24 hours at 70+ knots of wind feels pretty godlike.

Thanks for the feedback everyone, and yes, I still would rather a mooring to a dock any day except provisioning day.

Still waiting for advice on how to correct the spelling of my screen name.
Reply With Quote Share with Facebook