Shroud stretch

[Ryan]

I am in the process of building new standing rigging for my boat with new 316 SS 1x19 wire. The upper shrouds are 3/16" and about 34' long and the lowers are 5/32" and about 18' long. When cutting a fitting the new turnbuckle studs (Hayn Hi-Mod), I know I need to account for the different amounts of stretch in the wire. Can you guys give me a ball number for these wire types/lengths as to amount of total stretch I am likely to see. I have the numbers in the "Apprentice" and at this stage I am just looking for a little reinforcement that everything is right before I start cutting. Thanks for any info.

Ryan Haley

[Brion Toss]

Hello,
I commend you for your caution. We have a chart we could send to you, showing typical deductions for given lengths and loads (contact maria@briontoss.com). The load part is important, as how much you deduct is largely based on expected tune. On your boat, for instance, tuning stretch for the uppers might approach 3/4" or so, but only if the wire is the right size for a 15% to 20% tune. Constructional stretch will always be the same for a given length, but this is usually a teeny deduction.
Fair leads,
Brion Toss