Joel, I think the "too simple" part of your plan is the attachment to the boom. The sail is attached at the ends (functionally, even if it's got a bolt rope on the foot), so you would be bending the boom around that little dyneema loop. Probably breaking the boom.
Your mid-boom sheeting gets away with this because it spreads the load across 2-3 attachement points, and there are massive backing bars behind each of those shackles to spread the load further. So, you need to find a way to spread that load, too. Maybe a sail maker can make you a Dacron "sling" thing to wrap around the middle of the boom to spread it over 12" to 16" of length....or...if you are set on doing it yourself. ... instead of ONE dyneema loop, make it about 4 or 5 loops, or maybe one long piece of line wrapped 4-5 times...and then use some simple bullseyes on the side boom to keep each loop spread out along the boom... Just a thought. -Keith -----Original Message----- From: Joel Aronson [mailto:joel.aron...@gmail.com] Sent: Friday, May 10, 2013 8:57 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 _______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com CnC-List@cnc-list.com
