The easiest thing is to buy an old rope vang at a nautical yard sale. For my 38. mine is a Garhauer vang using 3/8 line that was originally on my 25. Attach the upper shackle to the bale for your mainsheet block, and snap the lower shackle to the toerail near the shrouds. Since you keep it taught when sailing downwind, there is no shock load and very little real load on the line so 3/8 yachtbraid is more than sufficient.
You race, so the problem will be that someone needs to go on deck to free up the preventer and switch it to the other side when you do intend to gybe. Either that or you need to rig a preventer on both sides of the boat, which is another line on deck to get in the way or snag the head of crew when you gybe. Either way, a preventer can be a PITA when shorthanded or single handed. The solution I've seen on a number of cruising boats is a boom brake. Rigged to a bale on the boom, with a continuous line from toerail to toerail. It does not stop the accidental gybe, but it slows down the motion of the boom. And it's not likely to be a problem when you intentionally gybe because you don't want the boom to slam over when racing. I don't recall how many times I made a mental note to slow down when I was first racing. But then, to paraphrase Mr. DeMille , a mental note is not worth the paper it is written on. Here are links for the Walder boom brake (a bit pricey) and a less expensive one from Wichard. http://www.boom-brake-walder.com/website/?p=7 http://www.wichard.com/fiche-A%7CWICHARD%7C7150-0203030000000000-ME.html Rick Brass Washington, NC From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Joel Aronson Sent: Friday, May 10, 2013 8:57 AM To: cnc-list@cnc-list.com Subject: Stus-List Gybe preventer The doctor who spoke at the Safety at Sea seminar said the #1 thing you can do to prevent injury is to rig a gybe preventer. My mainsheet sheets mid-boom. I know you need a rope with stretch to absorb shock. I was thinking of making a preventer as follows: Dyneema loop around the boom just aft of the mainsheet blocks. 3 strand nylon with snap shackles to attach to the loop and toe rail. Is that too simple? Should it run through a block to a cleat or clutch? -- Joel 35/3 Annapolis 301 541 8551
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