Rocky Mtn Sailor wrote:I had a chain on a danforth anchor tethered to the bow U-bolt.
No actual anchor line? That could be your problem.
So many things I see wrong here if that's the case.
First, if you have all chain, you have nothing for shock absorption. In a storm, the bow will bounce and you'll jerk that eye bolt and with nothing to absorb the shock, something has to give.
I saw this years ago when a Noreaster ripped through Raritan Bay. 40% of the boats on moorings in the area broke free. Many problems were cited for the cause. During the heavy storm, the boats pitched violently in the waves. Many deck cleats ripped out from the sudden jerking stresses. Others had their pendants cut by bow anchors that came in contact with the bucking bronco boats. Still others found their pendants snap from heat fatigue of the sudden jerking.
What I learned is that the line attaching your boat to the mooring needs to be heavy and protected from contact with bow hardware like anchors etc. Any shock absorbing you can do will help.
The next problem I see with your setup is a danforth anchor. I would not sleep at night with that holding my boat. A 180 degree wind shift will pull that anchor out. It will likely reset, however one day it wont.
Your screen name is "Rocky Mtn Sailor". I sail in the Rockies in Montana. I can tell you we get some wild and dangerous T-Storms in the summer. Last year one came through and ripped our marina docks apart. One section of floating dock broke away carrying boats off until it landed on shore. You need good ground tackle if you are going to keep your boat here. I know people think lakes are small, but our mountains are big and winds get violent.
I don't know how much control you have over your mooring location, but if it were my boat, I'd secure it as best as I can. Three feet of water gives you a lot of options you can do yourself. Our lake levels change throughout the season. My boat is sitting in a slip in 28' of water. By the end of the season it might be 4'
Here is a good article on mooring systems. http://www.westmarine.com/WestAdvisor/C ... nt-Mooring
If it were my boat in 3 feet of water, I'd jump over the side and screw one of those helix anchors into the bottom and attach all the proper swivels etc. to make a solid attachment. Then I'd have some stretchy line in the equation so it has some give in a bouncy storm.