Hi, I have heard of folks using Dyneema for a preventer because they feel that stronger is better. Dyneema is actually a poor choice and can actually beak in a sudden impulse before a simple nylon line would, but more importantly, using Dyneema would provide a greater beating on the rigging than necessary.
It is the same principle as why one would not use Dyneema for anchor rodes. Because of the stretch, nylon feels a much smaller force. Since the energy absorbed by the line is the product of force times stretch, the Dyneema, with little stretch, will feel a much greater force for the same sudden impulse. There is a great demonstration comparing Dyneema and nylon in dynamic loads at http://dmmclimbing.com/knowledge/how-to-break-nylon-dyneema-slings/. - Paul E. 1979 C&C 29 Mk1 S/V Johanna Rose Carrabelle, FL On May 10, 2013, at 12:00 PM, cnc-list-requ...@cnc-list.com wrote: > From: a.burton.sai...@gmail.com > Date: Fri, 10 May 2013 11:32:55 -0400 > To: cnc-list@cnc-list.com > Subject: Re: Stus-List Gybe preventer > > One thing I've seen on boats that run a lot or have high, long booms, is a > permanently rigged piece of Dynema attached at the end of the boom and run > forward to the a snap-shackle at the gooseneck. That way it's easy to rig a > preventer to the bow when the sheets are already eased; just release the line > from the end of the boom and snap it to the preventer from the bow. If > running to the bow, I will usually just run the preventer through the mooring > line fairlead...with appropriate chafe protection if it's going to be rigged > for more than a few hours. > > > > Andy > C&C 40 > Peregrine
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