2 types of stretch: Constructional and Material.

1. Constructional stretch is about aligning the braids of a rope in a straight line with load.
2. Material (elastic) stretch is inherent in the solid material properties.

Braided line has constructional stretch, unless you pre-stretch it at elevated temperatures which is exactly what Dynex Dux is. For low loads (as a percentage of breaking strength) Dynex Dux has almost no constructional stretch.?? Imagine a rigging material that you can easily splice and has low stretch properties.?

Colligo Dux Properties
Dux Diameter	Weight per 100 meters (kgs)	Weight per foot (kgs)	Dux Weight (lbs/ft)	Breaking Strength (kgs)	Breaking Strength (lbs)	Stretch mm/mm/1000kgs	Stretch in/in/1000 lb
5	1.88	0.005730	0.012607	4760	10472	0.004984	0.002266
6	2.67	0.008138	0.017904	6400	14080	0.003461	0.001573
7	3.4	0.010363	0.022799	7500	16500	0.002543	0.001156
9	5.4	0.016459	0.036210	12000	26400	0.001538	0.000699
11	8.3	0.025298	0.055656	18400	40480	0.001030	0.000468
13	11.2	0.034138	0.075103	24500	53900	0.000737	0.000335
15	14.4	0.043891	0.096561	30700	67540	0.000554	0.000252
16	18.6	0.056693	0.124724	39200	86240	0.000487	0.000221
18	22.6	0.068885	0.151547	46900	103180	0.000385	0.000175
20	27.4	0.083515	0.183733	56000	123200	0.000312	0.000142
21	32.1	0.097841	0.215250	64800	142560	0.000283	0.000128
23	37	0.112776	0.248107	73600	161920	0.000236	0.000107

Equivalent Stretch Sizing
Dux Diameter	Stretch Equivalent Navtec Aramid	Stretch equivalent to 1x19 wire	Stretch equivalent Navtec Rod
5	3.8T	5 mm	-4
6	5T	6 mm	-6
7	7T	6.4 mm(1/4")	-7
9	9T	8mm (5/16")	-10
11	15T	10 mm	-17
13	20T	12 mm	-22
15	25T	14 mm (9/16")	-30
16	-	15 mm	-
18	31T	16 mm (5/8")	-40
20	43T	19 mm (9/16")	-48
21	-	20mm	-
23	54T	22 mm (7/8")	-60

We recommend sizing line for creep at static (constant) loads, using the creep chart provided, while making sure any predicted sustained dynamic loads will not produce creep issues either. Use the Stretch information to size ilne for desired stretch. While making sure the maximum loads are not more than 20% of breaking strength.

Call or email us for help in selecting the right Colligo Dux Rigging for your boat.

The important thing to remember here is that creep has an exponential relationship to stress (Force per unit area). Keep the loads low relative to breaking strength and the creep goes way down to levels we can manage.

Example: Flying Tiger One Design sailboats have pre-tensioned shrouds to about 1200 lbs-f tension on a 1/4, 1x19 wire. You could use 7 mm dux and deal with less than 1/2 inch creep per year or go with 9 mm and have about .06 inches per year of creep on a Flying Tiger! Not to mention reducing standing rigging weight by at least 75% with most of that aloft and affecting righting moment, sailing more upright and lighter means more speed!

Breaking Strength Comparison to wire rope and rod rigging.


Weight Comparisons to wire rope and rod rigging.

**Wire rope Specifications are from Loos and Co, Rod Specs are from Navtec, Dux Specs are from Hampidjan. Other size comparisons are available.

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