Originally Posted by Tom Blalock
New nylon can stretch about 40% before breaking. Allowing 30% (age and attachments), a 15 foot snubber can stretch 4.5 feet. That should be sufficient for a 5 foot wave, considering the catenary of the chain and the boat dipping before rising.
Example: a boat would use ~ 8000# rope/chain attached to an anchor
that might hold 1500#. The SWL of the rigging
is ~ 2000#, and so everything is ballanced. However, the stretch at 1500# load is what matters, and it will not be 30%, but closer to 10%. Thus, in 5' waves, by that reasoning, a 50' snubber is needed, if the same diameter as the rode
I have over-simplified. However, anchoring
in 5' waves in a blow - that is really something to avoid. If not, you're going to need a lot of anchor
, chain, and a lot of snubber, I think.
I am quite sure that a rope
that stretches 30% will only do that a handfull of cycles before it snaps. They are scary to watch, when loaded that hard. Imagine a 1/4" snubber - it would probably last through 5-10 waves.