Forum: SparTalk
05-17-2017, 07:10 PM
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Replies: 4
Views: 2,694
Options
Hi,
I've been asking around, and an excellent source gave me some recommendations in the Seattle area. Be in touch with PM if you are interested.
Fair leads,
Brion
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Forum: SparTalk
05-06-2017, 08:21 AM
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Replies: 4
Views: 2,694
Site, and boats
Hi,
First, spam has obviously entrenched itself here. We are waiting for a tech to come and install a better version, but it might be a while. So apologies for this mess, which has caused a...
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Forum: SparTalk
04-28-2017, 09:52 AM
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Replies: 4
Views: 2,104
Options
Hi again,
As an engineer, you might enjoy/comprehend Larsson & Eliasson's Principles of Yacht Design. A much-simplified version can be found in the Rigger's Apprentice. There is really a rather slim...
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Forum: SparTalk
04-27-2017, 11:09 AM
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Replies: 4
Views: 2,104
Vectors
Hello,
Yes, a definite problem. Spreader thrust from the weather upper will be working on a rather long lever arm. On the other hand, if the mast section is right for a lower spreader location --...
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Forum: SparTalk
04-11-2017, 08:28 PM
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Replies: 4
Views: 3,325
Data
Hi,
At that level, the difference in strength is not significant, especially as, until further improvements are made, the breaks we are getting are in the eye, not adjacent to the button (see...
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Forum: SparTalk
03-24-2017, 12:40 PM
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Replies: 4
Views: 2,599
Variables
Hello,
The good news is that you are in a position to set an optimal position for your mast. The bad news is that determining that position, in terms of both rake and bend, can be tricky.
Let's start...
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Forum: SparTalk
03-19-2017, 05:36 PM
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Replies: 5
Views: 2,381
Maybe...
Hi again,
From what I can see, this is not Blizzard; that has two tracer colors in every color, and is much more smoothly made than what you show. Where did you buy it?
Fair leads,
Brion Toss
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Forum: SparTalk
03-18-2017, 10:31 AM
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Replies: 5
Views: 2,381
Hm
Hi,
That appears to be an HM-core rope; if it is, it takes a different splice. What brand and model is it?
Fair leads,
Brion Toss
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Forum: SparTalk
03-13-2017, 09:17 PM
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Replies: 3
Views: 2,288
Variables
Hi,
Dyneema eyes can get down to a 1:1 ratio of rope to pin before break strength drops -- in the lab. But a loose cover, a tight fit in the sheave, and what is likely some component of strong...
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Forum: SparTalk
03-12-2017, 08:14 AM
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Replies: 5
Views: 2,622
Ick
Hi,
If this is new rope, Samson deems it unspliceable (http://www.samsonrope.com/Pages/ProductList.aspx?CategoryType=1&Category=Double%20Braid%20/%20Parallel%20Fiber%20core). If it is antique, they...
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Forum: SparTalk
03-04-2017, 07:05 PM
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Replies: 7
Views: 4,426
Complications
Hello,
As I understand it, braided cabling covers are how braided rope got its start. And you can get a variety of cover-only ropes suitable for covering HM cores. The trouble is that you have to get...
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Forum: SparTalk
03-04-2017, 07:03 PM
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Replies: 4
Views: 3,325
Variations
Hi,
Looks like a good one, though the claimed break percentage seems high; does anyone know what the number is based on? Samson, and others, list minimum, average, and maximum break strengths in...
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Forum: SparTalk
03-03-2017, 05:08 AM
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Replies: 1
Views: 2,063
Details
Hello,
And first, sorry for being so slow in replying. Anything that has less elasticity, but not more weight, would make for an improvement, and your boat would notice the difference. Whether it...
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Forum: SparTalk
03-03-2017, 05:00 AM
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Replies: 7
Views: 4,426
Options
Hello,
We have rigged numerous boats with Spectra/Dyneema, both traditional and modern. It can be readily served; we parcel with friction tape, both to provide a slightly adhesive bedding for the...
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Forum: SparTalk
02-05-2017, 04:49 PM
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Replies: 3
Views: 1,981
ratios
Hello,
If you run the numbers on classical lanyard proportions (half the shroud diameter for rope, same diameter for wire), you will see that the lanyard is always significantly stronger than the...
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Forum: SparTalk
01-25-2017, 07:03 PM
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Replies: 3
Views: 2,283
Vectors
Hi,
A loose fit isn't necessarily a deal-breaker, assuming that you have lots of compression surface to bear on, and that the loads on the iron run straight down the bowsprit. Unfortunately, few...
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Forum: SparTalk
01-14-2017, 04:48 PM
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Replies: 4
Views: 2,437
Details
Hi again,
A small portion of the stay load is expressed laterally when the loads are highest (on the wind in a breeze), and the mast itself provides the needed lateral resistance. Your current...
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Forum: SparTalk
01-13-2017, 11:42 AM
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Replies: 4
Views: 2,437
Throw them away
Hi,
I think it is safe to say that those intermediates are doing little or nothing to stabilize the mast or make use of loads. Try sailing with them tuned, then slack, and see if you can notice any...
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Forum: SparTalk
01-13-2017, 11:39 AM
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Replies: 3
Views: 1,994
Options
There is a strength reduction in any hitch, probably about 20% in this case. Not a significant loss. Ring-hitching to the clew does make for a bump, that can hang up in some cases, and can damage...
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Forum: SparTalk
12-28-2016, 05:06 PM
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Replies: 9
Views: 3,197
Still yes
Hi again,
Now those rigs are an interesting historical sidenote, in that they skipped the lower spreaders with the uppers, not the intermediates. As with the BCC's this worked... sort of. The masts...
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Forum: SparTalk
12-22-2016, 06:18 PM
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Replies: 1
Views: 2,209
Catching up
Hello all,
For the past 6 weeks, I have been utterly immersed in rerigging the replica of the "Columbia Rediviva." In Disneyland. Yes, it is Disneyland, but it is a real rig, and the people who run...
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Forum: SparTalk
12-18-2016, 05:34 AM
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Replies: 9
Views: 3,197
Yes
Hi,
This is a relatively rare configuration, though standard, unfortunately, on Bristol Channel Cutters. The original rig there was single-spreader, with aft-led intermediates. The builder then went...
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Forum: SparTalk
11-16-2016, 07:25 PM
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Replies: 2
Views: 1,999
Variables
Hi,
First, the weight of the furler is of no significance, unless perhaps it is made out of very thick lead. There is also no reliable correlation between displacement and rig loads. The jibstay --...
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Forum: SparTalk
11-01-2016, 12:23 PM
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Replies: 1
Views: 2,062
Options
Hello,
A good scissor sharpening service will be able to do it for you, though they might find that they have to work hard to get any effect on that very tough steel. Here in the shop we use a belt...
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Forum: SparTalk
10-19-2016, 01:30 PM
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Replies: 5
Views: 2,776
Bolts
Hi again,
The primary load on those bolts will be in shear. Even if the deck plate doubles to support halyard turning blocks, it is most unlikely that any halyard would provide even a 1,500lb...
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