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Dynex Dux
Together, with our riggers, we are the most experienced and knowledgeable users of Dynex Dux UHMWPE line for recreational boating applications.
We are daily finding more applications for this great product, let us help you with yours.
** Important Note: Dynex Dux is not rope as you know it, it is much stiffer. Bending Dux in too tight of a radius results in a significant strength decrease and reduced fatigue life. For long term durability of this line always make sure the line terminations you use have at least a 5/1 dia/dia, bending ratio. Other companies sell line fittings designed for soft lines such as dyneema SK-75 or kevlar with a smaller bending radius, using these fittings for Dynex Dux will result in less strength and fatique life and coupled with long term UV exposure and normal chafe, present a much higher risk of rig failure.
See below for pricing.
Want to rig your boat with Dynex Dux standing rigging?
See our Feb 2008 Newsletter.
Dynex Dux is the first 12 strand line that has similar stretch characteristics to 1x19 wire rope. In fact it can easily be sized so that you have less stretch than your wire rope with a minimal windage increase.
You can have synthetic rigging for about the same price as wire.
Worried about Chafe? Loggers drag logs thru the woods with it. Toughest synthetic there is.
UV? Best uncovered Synthetic for UV resistance. At least 3-5 years with our Hardware (bending radius speciifc). Our UV study will be published here soon for more detailed info. We expect a higher number.
Easily spliceable, inspectable, 1/6 the weight of wire and,
1/3 the price of PBO!
It's about the stretch...
UV? Best uncovered Synthetic for UV resistance. At least 3-5 years with our Hardware (bending radius speciifc). Our UV study will be published here soon for more detailed info. We expect a higher number.
Easily spliceable, inspectable, 1/6 the weight of wire and,
1/3 the price of PBO!
It's about the stretch...
2 types of stretch: Constructional and Material.
- Constructional stretch is about aligning the braids of a rope in a straight line with load.
- 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.
Below is a chart showing exactly why you can use Dynex Dux for standing rigging. The elastic stretch of Dynex Dux is similar to wire rope:
**Larger sizes available, please inquire.
Size Breaking Strength Safe Working Load 5 mm
7mm10,400 lbs-f
15,000 lbs-f2100 lbs-f
3000 lbs-f9mm 24,000 lbs-f 4800 lbs-f 11mm 36,800 lbs-f 7360 lbs-f 13mm 49,000 lbs-f 9800 lbs-f
We recommend sizing line for creep at static (constant) loads, using the creep chart provided. While making sure the maximum loads are not more than 20% of breaking strength.
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!
The above is calculated using a derived creep relationship equation on SK-75. Dynex Dux will actually have less creep than shown above, we just don't know how much less.? More data is to come. We are working on a relationship equation for Dynex Dux but the problem with creep (deformation over time) is that it takes time.
Breaking Strength Comparison to wire rope and rod rigging.
| In lbs-f | 1x19, 316 Stainless | Nitronix Rod | Dynex Dux | In this size comp, DUX is.. | In this size comp, DUX is.. |
| 1/4" (6.4 mm) (Dux 7 mm) | 6900 | 10,300 | 15000 | 117% stronger than 1x19 | 45% stronger than Rod |
| 3/8" (9.525 mm) (Dux 11 mm) | 14800 | 22,500 | 36800 | 150% stronger than 1x19 | 64% stronger than Rod |
Weight Comparisons
| In lbs/ft | 1x19, 316 Stainless | Nitronix Rod | Dynex Dux | In this size comp, DUX is.. | In this size comp, DUX is.. |
| 1/4" (6.4 mm) (Dux 7 mm) | 0.135 lbs/ft | 0.167 lbs/ft | 0.0233 lbs/ft | 82% lighter than 1x19 | 86% lighter than Rod |
| 3/8" (9.525 mm) (Dux 11 mm) | 0.300 lbs/ft | 0.376 lbs/ft | 0.0797 lbs/ft | 73% lighter than 1x19 | 79% lighter than Rod |
**Wire rope Specifications are from Loos and Co.
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