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Crimps for lifelines; Copper vs Nickel Plated Copper?


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What is the right crimp for the job? Copper or  Nickel Plated Copper?

Also, why are lifelines tensioned with the weird bit of lashing, rather than something like a turnbuckle / rigging screw? 

I assumed it was so you could cut it free? But the swages ends won't pass through a stanchion anyway so what does it gain you?

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The rule is / used to be that cutting the cord would give you enough slack to help retrieve a MOB via the side-decks. This was a rule I remember affecting racing boats in the UK 20-30yrs ago and before open transoms were mainstream. No idea if still applicable today.

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Interesting - its what the PO had - but it was raised about an 1/2 inch off the floor of the wooden lattice that runs along the floor of the cockpit so you would never really stand on it. 

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"Jackstays shall have a minimum strength of 2000kg.
Webbing that lies flat is recommended."

https://www.yachtingnz.org.nz/resources/yachting-new-zealand-safety-regulations-2021-24

I would use dyneema, webbing doesn't seem to last to well.

OSR is a bit more explicit, technically you are required to meet this standard too, YNZ seem a bit lost on this though.

"have a breaking strength of 2040 kg (4500#) and be uncoated and nonsleeved stainless steel 1 x 19 wire of minimum diameter 5 mm (3/16”),webbing or HMPE rope"

https://www.sailing.org/documents/offshorespecialregs/index.php

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