Should I use Dynex Dux?

[Gashmore]

Sorry for the delay. The mast has not been ordered yet. I want to make a final decision on the standing rigging before I commit so other than the composite chainplates (2 for V1 &V2 and 1 for D1) I am not limited. I don't believe I am locked into tripple spreaders either if doubles would be easier to work with. OTOH, the additional weight of a stiffer mast might use up all the weight savings of the Dynex.

BTW, I have done some deductive analysis on the stretch factor which I will put in a separate post.

[Brian Duff]

Gashmore ,

You have listed a beam and RM for your boat, along with rig dimensions, but I would like to know what type and model of boat you have. Are the chainplates all the way outboard?
Why does it have no spar now ?
Where is the boat in the Caribbean ?

How will the boat be used ?

with that RM and the beam and the I you listed, we could do a good Dynex rig I think. You should consider actually hiring a rigger to help you with this design and planning, as well as the construction and rigging of the boat. The fittings available for Dynex will not work with standard mast parts.

Are you coming to Annapolis for the show ?

[Gashmore]

The hull is cedar strip/composite. Designed by John Fox and based on a de-tuned Nelson Marek 46. Builder is yours truly and currently in my backyard here in Georgia. Expected launch date Summer 2008. Web site is www.rutuonline.com. I have not had time to update it is some time but it will give you an idea of the project.

Composite chainplates are laminated into the topsides, The boat will be used for Caribbean island hopping 6 to 8 months a year and Florida/Georgia coastal during the hurricane season. I am talking to Selden and Charleston Spar about providing the bare spars and spreaders but I need to settle on the standing rigging method before I commit.

Being a numbers oriented engineering type I have built a spreadsheet based on Larsson & Eliasson but lack credible stretch figures for Dux. I did find a figure of .0012 mm/mm/1000Kg on Strong Rope's site and extrapolated figures for 9 and 13mm based on rope weight but not knowing exactly where Strong's number comes from I can't really trust it. I have asked Colligo for a sample of 9mm to pull and try to get some independent results. I am amazed that Hampidjan doesn't seem to have any stretch figures.

I am a hard core DIYer but will definitely seek professional help for the rigging. Waited to late to get a hotel room south of BWI so I will be flying up for VIP day at o'dark thirty. What booth are you in?

[Brian Duff]

Interesting Project.

I wish there was more rig detail on you website. I am interested in discussing what your doing, even if you don't need to hire someone to build it for you!

Do you have more detailed drawings on the rig plan from your designer? I hope so