Working elasticity on wire rope

[seawolf]

Hello all,
Here is a question I could use some help on.
I am changing all the 1x19 wire on my old gang. I am using the old wire as a template. The rig was in tune with the old wire. And measurements will be made with the orginal turnbuckle settings while the rig was in tune.
Question:
Since the rig was in tune, can I assume that the old wire was cut to size with the working elasticity computed in, and that I will not have to worry about this computation if I match the wire lengths exactly?

Wire is 1X19 SS, 7/32 dia. and the longest wire is the backstay at approximately 35 feet.
Cap shrouds approximately 30 feet.
Any feed back appreciated.
Seawolf

[Brian Duff]

Match the overall lengths exactly with the turnbuckles set where they were when the rig was tuned.

Measure the overall length of each cable - from the pin at the mast to the pin on the chainplate. Make the new rigging this length, but set the new turnbuckles 1/3 closed. This will give you a kit that looks to be made by a professional when re-installed.

For your purposes , 1by19 stainless rigging cable has no meaningful stretch or elongation, don't even waste your time trying to figure it out.

[seawolf]

Brian,
Thanks for the advise.
The last thing I wanted was a wire to short!
I just installed my first sta-lok eyes today on one end of the 1/4 inch lower shrouds in preparations for the rerig. The new wire was left a little long and I will cut to size when the old one is down. I followed the instructions on Brion's DVD, and all went real smooth.
I also cut the wire with a sawsall using the block of wood jig that Brion had mentioned about and I could not believe how clean a cut it made. And took just seconds.
Thanks again for all the great advise on spartalk.
Seawolf
Fairwinds to all.

[Brion Toss]

Hello,
As noted above, you'll be setting your turnbuckles at exactly where they were when the rig was tuned, then measuring the LOA. But it is important that, if you change the turnbuckle extension, you add or subtract length on the wires. Say, for instance that you have a 30ft 0in. LOA, but the turnbuckle is an inch more closed than ideal. For the new gang you'll open the turnbuckle an inch, and take an inch off the length of the wire. Clear?
And for others reading this, if your old gang was not tuned properly, you either need to tune it before removing the old gang, or calculate how much to add or subtract to get ideal, tuned LOA's for the new gang.
Finally, I'm so glad that the site is of use to you.
Fair leads,
Brion Toss

[seawolf]

Brion,
Got it.
And the site has been very helpful and informative.
I think it is a great service to the layman that is trying to learn more about their boats and rigs to have a group of professionals and non professionals alike, willing to share their techniques and advise and hard earned knowledge.
Thanks again to everyone for the help.
Fairwinds.
Seawolf