current rigging specs

[megan]

We are replacing the standing rigging on our 1982 7.9. The current rigging was measured for mast rake or bend and the head stay has been replaced with a roller furler. We don't want to send this stuff off to riggingonly. Does anyone have the current rigging specs. I know you are talking about changing the headstay length but I think we need the old length plus the other rigging specs. We have measured and come close to a set of specs we have (don't know if they are correct) except for the backstay which is 4" short???? Any help will be greatly appreciated. Thanks Megan

[Jim Kloss]

If you have a FAX I will send you the table of standing rigging specs that came with the boat -- factory original. Reply here or PM me.

Jim Kloss
s/v Ambivalence
S2 7.9#8

[Tim Bosma]

Megan,
I have the original owners manual as apdf on the hottamaleracing.comwebsite under the Links option. page 9 is the rigging specs.
Thanks,

[megan]

Thanks Tim - We got them from your site. Are they also the current rigging specs? Is there a max forestay length?

[Tim Bosma]

Megan,
checking the Boston Tuning Guide (also on my site - shameless plug), I find that 31'8" is the recommended length and is the Class Max allowed.
Thanks,

[megan]

Thanks again Tim. You do have a great site. Megan

[megan]

Tim, does the 31' 8" allow for the mast rake/bend that is supposed to make the boat faster. If using max headstay what does one use for the backstay and bridle (not using the spectra cascading system)? Megan

[megan]

Sorry, all kinds of thoughts rummaging around our heads as we prepare to buy all new rigging. We think we probably want a straight mast and, if so, we assume the factory specs are the way to go. Any philosophical thoughts on this? We haven't even sailed this boat yet so don't know quite what we want.

[dave]

Megan, don't make the common mistake of confusing rake and bend. The two are totally independent from one another. Also, to reach the class max pin to pin headstay length on my boat took the addition of a toggle at the stemhead fitting. Therefor, a new headstay should be build for the proper pin to pin length WITHOUT having to add the toggle.

"A1.C.9. The length of the headstay is limited to a maximum of 31 feet 8 inches from centerline of the mast forestay tang
pin to centerline of the stemhead fitting pin. The stem and mast fittings can not be altered from the factory
standard"

The boat Is more fun to sail when you get rid of the old school OEM SS backstay and bridle and go with a rope backstay and kicker to clear the leech in light air. Last thing: if I were ordering new standing rigging for my boat I'd order the uppers and lowers 1" shorter to leave a little more adjustment room in the TB bodies. With the max rake measurement and the stock rigging measurements my TBs are almost completely closed in heavy air.

[AllenDurow]

A bit off topic but does anyone know where to get the little rubber yokes that hold the shrouds from slipping out of the mast? Mine are getting a bit dry rotted and I'd like to have a couple spares.

Thanks,
Allen
Lift Ticket #513

[dave]

Any rigging sop, West Marine, APS, Layline.....................................................................

[megan]

Dave, why is it more fun to sail with the rope backstay than the old wire and bridle? If we were to lengthen the headstay to 31' 8" how much do we shorten the wire and bridle backstay. Will the main clear the wire backstay. We're reluctant to use rope that will degrade so quickly down here. All this discussion on foils and standing rigging has been very helpful - thanks.

[dave]

If you have a newer main with a shorter than max leach that means that the girth measurements in the sail are relatively higher, making a bigger roach. In lighter winds the roach won't clear the backstay with a full top batten unless you use the rope with a kicker. Everytime you tack or jibe the leech of the sail tries to hang up on the backstay. This is not only a pain in the a$$ but causes premature wear and tear to the sail. Changing out a rope backstay ever so often is cheaper than a new main or maybe even some serious sail repair. Plus, the new stuff lasts longer than you think in the sun.

The class rules limit the high tech backstay line size to 3/16" minimum. This is overkill on strength but wisely takes into account the degradation in strength over time and UV exposure and still results in a mighty strong line years down the pike. Most 3/16" UHMWPE line has a breaking strength of around 5,400 lbs, which is higher than the same thing for 3/16" 1 x 19 SS cable. Check this out; 10,494 lbs!!!! Even after much wear and exposure it would STILL be stronger than the SS cable. Old habits die hard...................................................


"Dynex Dux 75 - Hampidjan

Dynex Dux 75 - Hampidjan

Construction: 100% Heat Set Dyneema SK-75

Have you ever noticed how the more a handle of supermarket bags stretch the stronger they become? Well, the same idea has been applied to this cordage by Hampidjan called Dynex Dux 75. This twelve strand braided line made from ultra high molecular weight polyethelene, refined by DSM in the Netherlands and known to the sailing world as Dyneema, is “pre-stretched” by Hampidjan through heating under tension to further align and compact fiber structure resulting in a “new” generation of ultra high performance rope.

Up to 20-40% stronger than typical Dyneema/Spectra, and UV and abrasion inhibiter impregnated for superior abrasion resistance and longevity, Dynex Dux 75 does not suffer from the creep, or static load elongation, seen in other fibers while remaining incredible strong and lightweight. Developed originally for use in the marine towing and fishing industries Dynex Dux 75 is a great alternative to more expensive and less durable PBO. We see it being used in applications such as stripped Farr 40 halyards and uncovered steering cables as well as guys, backstays, or anywhere else creep is intolerable and weight saving crucial. For better handling or cleating we can cover all or part of Dynex Dux 75 with a polyester or hi-tech jacket.

Common Applications
Uncovered: Steering cables, backstays and other applications that need high strength, low stretch and greater durability than Vectran.
Covered: Main and headsail halyards--especially on big boats. Afterguys and asymmetrical tack lines.

Spliceable: Yes Full Spools: Not Available
Size Tensile Strength Weight in Lbs/100 ft.
Inches Millimeters
3/16 5 10,494 TBD
9/32 7 16,411 2.28
3/8 9 26,527 3.62
7/16 11 40,465 5.57


ANNDD755GY Dynex Dux 75: 5mm, Gray Price: $2.85 ANNDD757GY Dynex Dux 75: 7mm, Gray Price: $4.16
ANNDD759GY Dynex Dux 75: 9mm, Gray Price: $6.70 ANNDD7511GY Dynex Dux 75: 11mm, Gray Price: $9.08"

[Tim Bosma]

Sounds like great stuff, Dave. It should be since it costs 5X what I am paying for bakstay line. That means that it would have to have a 15 yr expected life to make it cost effective.

[dave]

Hey, I didn't say that I used the stuff, only that's it's out there!

I'm not rich, I go for the best thing that I can afford. Sometimes that's top of the line and sometimes not. Having read the manufacturers stuff, it may be worth the money: they say NO UV problems!!!!

http://dynexdux.net/