Hey TopperHarley. I worked as a marine
contractor doing diving
and moorings here in Bermuda
. All of our bridles were designed to hold boats through hurricanes and we never lost
one of our boats that had been seen to within the last year due to a gear
failure on our part. The type of bridle
that you have should be custom-designed for your boat
specifically. Anything else is pure laziness and lack of creativity on the part of the person designing the mooring. The bridle setup will depend on a load of factors, such as bow roller, chocks, cleat position and arrangement, height of the bow etc. etc.
Having said that, the absolute preferred bridle arrangement if the design of the boat allows it (and yours does based on your description of the bow) in my view is as follows:
heavy bridle as big as feasible. For your boat that does mean about 1" nylon if the bow roller will accept this with the chafe hose. You say it does, just about. The metal thimble where it attaches to the mooring chain should sit at the water
level, and the bridle should then come up over the bow roller, covered in something like exhaust
hose for chafe protection. The eye of this bridle should come to aft of the headstay and this eye can be quite small diameter.
Next, you have a strop made from the heaviest line that will fit on the cleats, with an eye in both ends and again hose (probably clear, double reinforced PVC for this one so that it doesn't mark the deck
up) as chafe gear
. This goes from one cleat, through the eye of the heavy bridle and over to the other cleat. The length of this strop is important as it determines where the heavy bridle sits on the roller. You want it to be such that the pull on the cleats is as close to being in-line with the angle that the cleats have been mounted at as possible. The only time we ever lost
a boat that was set up like this was when the cleats had been poorly-installed by a cheap
manufacturer. Another boat had broken free, slammed into ours and the combined force ripped the cleats right out of the deck
Some of the advantages of this system over a double-bridle system are:
- Less chafe (chafe is the primary reason for boat loss during storms)
- No tangling of bridles
- The load is always spread between both cleats.
- Simple to pick up and retreive; the strop stays on the boat when you cast off. The pick-up buoy is attached to the heavy bridle.
Hope you figure it out! To stop it from jumping out of the bow roller, can you just tie a bit of twine a couple of times around the roller? Or a velcro strap or something?