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Now that Silverheels has new chainplates, it’s time to re-tune her standing
rigging. I did this originally when I re-rigged her 8+ years ago, with a
follow-up adjustment after the new wire had time to stretch. I use the Loos
& Co. Professional Tension Gauge, Model PT-3 (readings in lbs). I believe
I’m doing a credible job of it by following their instructions augmented by
a little research of my own. Still, I’d love to check myself against a pro –
without actually shelling out the shekels. Ergo…Has anyone hired a professional rigger to tune their P424 ketch rig, and if
so, would you mind sharing the final tensions of the various wires (either
by Loos’ scale, or in lbs, or in %-age of working strength)? Silverheels has
1/4″ mizzen wires, 5/16 main shrouds, and 3/8″ main head- and backstays with
a roller-furling genoa.Thanks,
Tor
Silverheels, P-424 #17
http://www.silverheels.us
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Tor,
I’ve not used a professional rigger on main mast rigging. I’ve used Brion
Toss’ Riggers Apprentice book to tune that rigging myself using the same
Loos guage you have. The Toss recommendations are:Lowers – 10-15% of working strength
Uppers, fore and back stays – 15-20%When I last tuned Sarah in 2008 after re-rigging, I went with the lower
values shown above. That set up the rigging very tight so I didn’t go
further.
The mizzen was tuned by a rigger last year when I replaced that rigging. I
haven’t checked that rigging to see if it is withing the Toss
recommendations.
The Loos PT-3 doesn’t seem to work on the 7/32 mizzen wire, so I have one
of the old Loos gauges that is basically a big spring.Regards,
John Stevenson
http://www.svsarah.com
Sarah’s BlogOn Thu, Sep 3, 2015 at 12:24 PM, Silverheels via maillist <
> wrote:Now that Silverheels has new chainplates, it’s time to re-tune her standing
rigging. I did this originally when I re-rigged her 8+ years ago, with a
follow-up adjustment after the new wire had time to stretch. I use the Loos
& Co. Professional Tension Gauge, Model PT-3 (readings in lbs). I believe
I’m doing a credible job of it by following their instructions augmented by
a little research of my own. Still, I’d love to check myself against a pro
–
without actually shelling out the shekels. Ergo…Has anyone hired a professional rigger to tune their P424 ketch rig, and if
so, would you mind sharing the final tensions of the various wires (either
by Loos’ scale, or in lbs, or in %-age of working strength)? Silverheels
has
1/4″ mizzen wires, 5/16 main shrouds, and 3/8″ main head- and backstays
with
a roller-furling genoa.Thanks,
Tor
Silverheels, P-424 #17
http://www.silverheels.us
_______________________________________________
maillist mailing listhttps://pearson424.org/mailman/listinfo/maillist_pearson424.org
_______________________________________________
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Thanks, Norris. Although the term “cap shrouds” is new to me (I assume you mean the uppers), I get the idea. I’ve read enough on this to grok the basics. I was just hoping some professional rigger had tuned someone’s 424 ketch and written down the specific, final tension numbers for each wire pair in a report to the owner. For my purposes, these numbers can be stated as either Loos’ scale, lbs. of tension, or %-age of breaking strength (assuming 1×19 ss wire).
Here is what I’ve been using on Silverheels:
Wire
Dia.
Loos Scale
Lbs. of Tension
%-age of breaking
*Headstay
3/8″
46
3100
18%
Main backstays
3/8″
47
3500
20%
Main uppers
5/16″
31
2200
17%
Main lowers
5/16″
27
1600
13%
Staysail stay
5/16″
27
1600
13%
Mizzen uppers
1/4″
15
1400
17%
Mizzen lowers
1/4″
12
1100
13%
*I’m guestimating the headstay tension since the Loos Gauge won’t fit onto its roller furling foil.
Tor
Silverheels, P-424 #17
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Thanks, Norris. Although the term “cap shrouds” is new to me (I assume you mean the uppers), I get the idea. I’ve read enough on this to grok the basics. I was just hoping some professional rigger had tuned someone’s 424 ketch and written down the specific, final tension numbers for each wire pair in a report to the owner. For my purposes, these numbers can be stated as either Loos’ scale, lbs. of tension, or %-age of breaking strength (assuming 1×19 ss wire).
Here is what I’ve been using on Silverheels:
Wire
Dia.
Loos Scale
Lbs. of Tension
%-age of breaking
*Headstay
3/8″
46
3100
18%
Main backstays
3/8″
47
3500
20%
Main uppers
5/16″
31
2200
17%
Main lowers
5/16″
27
1600
13%
Staysail stay
5/16″
27
1600
13%
Mizzen uppers
1/4″
15
1400
17%
Mizzen lowers
1/4″
12
1100
13%
*I’m guestimating the headstay tension since the Loos Gauge won’t fit onto its roller furling foil.
Tor
Silverheels, P-424 #17
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Thanks for the info on the Loos guage specifics, Tor. I’ll be using them soon.
Good Lord, I didn’t know a Loos guage could cost so much! I just ordered one…the PT3 model that will work with our 5/16″ main stays. Also ordered mast steps…two for the lower main mast so my wife can reach the main halyard, and two for the top of the mast so I don’t have to struggle when working the very top. Found the top of mast steps immensely helpful with my previous vessel.
David
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