HM rigging

[Gary]

Thanks Jack, good point.
I was wondering about the "blue" as I saw no reference to the heat treating. I'm going to call Samson and Colligo and talk to them both. Then I need to actually calculate my static load and go from there. I'm wondering if there are any deferences in their testing and parameters for the figures they give. But If Samson is not doing the heat treating, then that would explain the difference in the ratings.

I like these kinds of problems and design puzzles....this is going to be fun! And in the end may boat will be so fast it will pass wind

Gary

[Jack]

I was curious and looked up the Vectran sheet.

http://www.neropes.com/product.aspx?...6C&lid=1&pid=5

And compared it to the Dynex Dux sheet

http://www.hampidjan.is/media/pdf/00...taflaagu02.pdf

One comparison I got (apples to apples) was for 11mm rope size. The other sizes are

1mm diferent.

So....11mm shows

Vectran......#21,000

Dynex Dux....#37,000

There are many other comparisons, and other factors. But the way to think of synthetic rigging is not just how strong do I need to hold the rig up, but how strong do I need to stop creep? By keeping the static load below 20% of breaking strength you will end up with next to no creep. The charts for this are at:

http://www.colligomarine.com/Colligo.../Dynex-Dux.htm

You can see the potential to have less creep than SS wire!

I used mostly 7mm for my 34' Searunner Trimaran. Cutter rig double spreader. The original specs were for 7/32" and 1/4" wires. We can really put a load on the rig with the stability we carry.

So far so GREAT!

As a little aside, I was talking to Hampidjan guys a while back about all this, he told me they are more interested in big boat stuff. They were producing 3" Dynex Dux with a double overbraid for an oil rig!.....It is "off the charts" I see 2" or 51mm has a breaking strength of 242 TONS!

Kee-rumba!....:-)

[Gary]

Great Jack, I'm getting the creep thing. Saw the chart from Colligo. The specs for my rig are 1/4 and 9/32. So I figured going 7 and 9mm. Using initial settings for wire my percentage will be around 3-4%. So that should solve the creep.

As far as the claim that it is cheaper than wire or at least comparable, I don't particularly agree. Yes, the line is slightly less expensive, but if you up size for creep it is actually more expensive. I did an initial estimate with 7 and 9mm Dynex with the ends and deadeyes. It would cost about $3200 to re-rig my 28' cutter. That will not deter me though. The thought of shedding about 70 lbs aloft is just to good!

Gary

[Gary]

As of now, notice how I qualify this, This is my plan.

I will use the Dynex Dux for my standing rigging. 7mm on the shrouds, whiskers and lowers. 9mm on head, fore, boomkin and back stays. I will stay with wire in Bobstay because of anchor line/chain chafe.

I will be using terminators and deadeyes from Precourt (in black). The medium series. Download there catalog here.
[www.precourt.ca]

Then I will use this black line for the lashings (New England V-100). That way the whole setup will be black. Hey, if you can't sail good you should at least look good! It's vectran with a braided sheath. This way it should hold the lashings well and not slip. Dynex is very slipery!
[www.westmarine.com]

Then to finish off I will rig a bowsprit traveler from Classic Marine.
[www.classicmarine.co.uk]

Then I will have may sails fitted with luff ropes made of Dynex. Rig a 2 part halyard led to a winch to host the sails with a Facnor Code 0 furler. This will be attached to the traveler.
[www.facnor.com]

So far I am estimating with furler, the cost of around 4000.

Gary
http://garyfelton.com

[Gary]

One more question. I know that weight aloft is not a good thing. But what can I actually expect by removing 70lbs out of a rig on a 28" boat weighing 15000 punds?

Gary