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Showing results 1 to 25 of 105
Search took 0.00 seconds. Search: Posts Made By: estarzinger
Forum: Deck hardware: Rigging, Sails & Hoisting 17-01-2014, 18:58
Replies: 254
Views: 29,106
Posted By estarzinger
Re: Load Testing Results

Interesting. It is too bad Tenara does not seem to sell a stronger thread - if they did it would eliminate the UV weakness of sewn splices. Is there an easy 'paint on' protection (like that "whip...
Forum: Deck hardware: Rigging, Sails & Hoisting 17-01-2014, 07:39
Replies: 254
Views: 29,106
Posted By estarzinger
Re: Load Testing Results

I just tested 3 dyneema lashings, in three sizes of line. I was curious how secure the half hitches are to finish the lashing, and where they would break.

In the smaller two lines, two half...
Forum: Deck hardware: Rigging, Sails & Hoisting 17-01-2014, 06:29
Replies: 254
Views: 29,106
Posted By estarzinger
Re: Load Testing Results

I was working a bit on 'bar tacking' . . .below is a photo.

On the right is the single pass zigzag. That's 16 stitches in 5/8", or about 25/in. The sailrite seems to do this pretty cleanly and...
Forum: Deck hardware: Rigging, Sails & Hoisting 17-01-2014, 05:02
Replies: 254
Views: 29,106
Posted By estarzinger
Re: Load Testing Results

I have been told that sort of light stitching has a very small negative effect on strength, but that it is practically speaking unmeasurable because the failure will almost always be at the end of...
Forum: Deck hardware: Rigging, Sails & Hoisting 16-01-2014, 11:14
Replies: 254
Views: 29,106
Posted By estarzinger
Re: Load Testing Results

I just tested the West stitching pattern, and it failed exactly as ThinWater suggested - not enough strength at the peel point. That is assuming we can really see the stitching and there really are...
Forum: Deck hardware: Rigging, Sails & Hoisting 16-01-2014, 10:41
Replies: 254
Views: 29,106
Posted By estarzinger
Re: Load Testing Results

Spinlock appears to be using bar tacks, that look to be up to mountain climbing standards.

74110

Wichard appears to be using 'down zigzag' that looks to me like it will peel from the stretch...
Forum: Deck hardware: Rigging, Sails & Hoisting 16-01-2014, 08:53
Replies: 254
Views: 29,106
Posted By estarzinger
Re: Load Testing Results

mmmm . . . here is West Marine's pre-made jackline. It is polyester, but there is almost no stitching at all at the stress riser' point. It's probably not going to hold anywhere near 4,500lbs...
Forum: Deck hardware: Rigging, Sails & Hoisting 16-01-2014, 08:39
Replies: 254
Views: 29,106
Posted By estarzinger
Re: Load Testing Results

^^ Thanks.

Just to check my instincts . . . I replicated that sailrite pattern (using nylon webbing and V92 thread, as they did). It broke at 1100lbs. I did it in polyester webbing, and it broke...
Forum: Deck hardware: Rigging, Sails & Hoisting 16-01-2014, 07:44
Replies: 254
Views: 29,106
Posted By estarzinger
Re: Load Testing Results

Just as an aside . . . while I was looking for webbing, I noticed this at Sailrite . . . it's in their instructions for DIY jacklines (using nylon tubular webbing). . . . . its with V92 thread and I...
Forum: Deck hardware: Rigging, Sails & Hoisting 16-01-2014, 07:14
Replies: 254
Views: 29,106
Posted By estarzinger
Re: Load Testing Results

I am looking for some 4,500lb (that's the jackline reg minimum) 1" polyester webbing . . . anyone have a good source? None of my usual places seem to carry it. I can find nylon, but not polyester?
Forum: Deck hardware: Rigging, Sails & Hoisting 16-01-2014, 06:46
Replies: 254
Views: 29,106
Posted By estarzinger
Re: Load Testing Results

^^

I did the uni with the standard 5 turns. And the water bowline I tested just above was the standard (unmodified) version.

This stuff is so easy to splice, I don't see many places for a knot....
Forum: Deck hardware: Rigging, Sails & Hoisting 16-01-2014, 05:50
Replies: 254
Views: 29,106
Posted By estarzinger
Re: Load Testing Results

Ok, the 'fishing knots" . . .

All these tests in 7/64" amsteel (single pulls, except the two knots which slipped where I did three just to confirm)

Two old reliable's as benchmarks:

Figure...
Forum: Deck hardware: Rigging, Sails & Hoisting 16-01-2014, 04:40
Replies: 254
Views: 29,106
Posted By estarzinger
Re: Load Testing Results

I am using a 20. Sailrite said 20 - 22.
Forum: Deck hardware: Rigging, Sails & Hoisting 15-01-2014, 20:44
Replies: 254
Views: 29,106
Posted By estarzinger
Re: Load Testing Results

^^

The water bowline does not slip, and with the modification of tucking the tail thru is about 50% strength.

I will test the other three.

I do not think any are going to be easy to untie...
Forum: Deck hardware: Rigging, Sails & Hoisting 15-01-2014, 14:05
Replies: 254
Views: 29,106
Posted By estarzinger
Re: Load Testing Results

And, by the way, this V138 thread seems like a good match to the polyester webbing. The stitches all break, but they also do visible damage to the polyester webbing fabric.
Forum: Deck hardware: Rigging, Sails & Hoisting 15-01-2014, 14:02
Replies: 254
Views: 29,106
Posted By estarzinger
Re: Load Testing Results

I just did one 'composite sewing pattern' a 1" square with a single diagonal across it. It broke at 2080lbs. It is a little hard to get an exact stitch count because the stitch length is different...
Forum: Deck hardware: Rigging, Sails & Hoisting 15-01-2014, 13:24
Replies: 254
Views: 29,106
Posted By estarzinger
Re: Load Testing Results

Sewing polyester webbing and V138 (very heavy) thread.

This was a test of 'small pattern' sewing samples to identify the component strength of bigger stitching patterns.

I tested three...
Forum: Deck hardware: Rigging, Sails & Hoisting 15-01-2014, 10:27
Replies: 254
Views: 29,106
Posted By estarzinger
Re: Load Testing Results

On wet nylon . . . . 3 pulls dry = 1190lbs and wet=1107lbs, with a stedev of 56 and a 95% CI of the mean of +- 64, so that is a statistically significant result (7% less when wet).
Forum: Deck hardware: Rigging, Sails & Hoisting 15-01-2014, 08:58
Replies: 254
Views: 29,106
Posted By estarzinger
Re: Load Testing Results

wet vs dry line . . . .

For dacron double braid . . .bowlines . . . 3 pull average breaking strength 1780lbs dry vs 1720lbs wet, with a 54lb stdev. So that's not a significant difference at the...
Forum: Deck hardware: Rigging, Sails & Hoisting 14-01-2014, 10:21
Replies: 254
Views: 29,106
Posted By estarzinger
Re: Load Testing Results

Back to amsteel splicing a minute . . .bury length . . .

First I am not sure what the official definitions of "bury" are - whether it includes the taper or not. I suspect 'officially' it does...
Forum: Deck hardware: Rigging, Sails & Hoisting 14-01-2014, 08:26
Replies: 254
Views: 29,106
Posted By estarzinger
Re: Load Testing Results

Basically a series of very close together but relatively long individual zigzag stitches (eg a lot of zig but not much zag :) ). The individual stitches are 'down' the webbing' but the bar is...
Forum: Deck hardware: Rigging, Sails & Hoisting 13-01-2014, 15:43
Replies: 254
Views: 29,106
Posted By estarzinger
Re: Load Testing Results

You do not comment on the increased tension . . . do you think it is right or better? It is pulled/sunk into the webbing on both sides.



Please do realize when I am doing the efficiency...
Forum: Deck hardware: Rigging, Sails & Hoisting 13-01-2014, 07:16
Replies: 254
Views: 29,106
Posted By estarzinger
Re: Load Testing Results

.........
Forum: Deck hardware: Rigging, Sails & Hoisting 12-01-2014, 20:34
Replies: 254
Views: 29,106
Posted By estarzinger
Re: Load Testing Results

Watching the samples fail, they always start to fail from webbing end (where the webbing tail is) rather than from the loop end. The tail curls/pulls up and you can hear some pinging . . . then...
Forum: Deck hardware: Rigging, Sails & Hoisting 12-01-2014, 20:16
Replies: 254
Views: 29,106
Posted By estarzinger
Re: Load Testing Results

I made up 4 more webbing samples, all with straight stitches, smaller stitches, and more thread tension (same settings on all samples)

What my data indicates is a clear correlation between more...
Showing results 1 to 25 of 105
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