Advertising via sail numbers? 55

            By: Roy Race (offline) on Monday, April 19 2010 @ 11:22 AM BST (Read 414 times)              

            Roy Race

Roy Race       

Hi,

Could someone (Tom?) clear up for me what is meant in the rules by:

"Sails shall be single ply soft sails made of woven or laminated ply."

Specifically, would 3DL, D4, Millenium, Vektor, Tape Drive, EPEX, FiberPath or any of the current load path technology sails or Cuben Fiber cloth be permitted as "laminated ply" under the rules?

Thanks.

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            By: Thomas Egli (offline) on Monday, April 19 2010 @ 10:38 PM BST  

            Thomas Egli

Thomas Egli   

The terms used in Rule 20.2 are defined in Section G of ISAF's

Equipment Rules of Sailing (ERS). In particular:

- G.1.1 defines "sail";

- G.1.4(b) defines "ply";

- G.1.4(c) defines "soft sail";

- G.1.4(d) defines "woven ply"

- G.1.4(e) defines "laminated ply"; and

- G.1.4(f) defines "single-ply sail".

From what I know of the various load path sails mentioned in your

post, they would all be considered "laminated ply" sails:

- North Sails 3DL (load-bearing filaments sandwiched by two films);

- Dimension-Polyant D4 (load-bearing filaments sandwiched by two

films);

- One Sails Millenium (load-bearing filaments sandwiched by two

films);

- One Sails Vektor (load-bearing filaments sandwiched by one layer

of film and one layer of tape);

- UK-Halsey Tape Drive (load-bearing tape bonded to a laminate

ply membrane that generally consists of a scrim sandwiched

by two films);

- Elvstrom EPEX (fundamentally similar to D4);

- Ullman FiberPath (fundamentally similar to D4);

- North Sails Cuben Fiber (load-bearing tapes sandwiched by

two polyester or fluoride films);

Please note that most of these sails have carbon filament versions,

which would not be allowed by our class rules. Filaments made of

non-carbon materials, e.g. polyester, dyneema, spectra, aramid/Kevlar,

Pentex..., are allowed.

Please let me know if additional information or clarification is required.

Best Regards,

Thomas Egli, Fireball International Technical Committee Chairman

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            By: Roy Race (offline) on Tuesday, April 20 2010 @ 04:12 PM BST       

            Roy Race

Roy Race       

Thanks Thomas, that's a very clear answer. I think I figured it out about a half hour after posting, but waited for your official reply anyway.

So the following would be not permitted:

1. Any sail material at all which contains carbon fibres

2. Monofilm

That's right, isn't it??

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            By: Thomas Egli (offline) on Wednesday, April 21 2010 @ 02:35 PM BST          

            Thomas Egli

Thomas Egli   

1. Anything with long-strand carbon fibres would be prohibited

under rule 8 - Prohibitions.

2. Monofilm would not be allowed because it is a single film

(that mono thing) rather than a laminated film, and because

it is easily damaged when folded flat, thereby contravening

ERS G.1.4(c) - Soft Sail. It also deteriorates badly under UV.

That being said, we trialed some monofilm jibs in the mid-

nineties. They worked out rather well, with decent shape

retention and good visibility, but were very prone to damage,

and tended to literally blow up at the worst possible moment.

3. I'm still not sure whether the North Sails 3Di process gives

a woven ply or laminate ply sail. One could argue that it's a

woven ply because there is no film, but one could also argue

that it's a laminate ply because it's made up of several layers

of combed-out fibre tape. I don't think North is rushing to use

the 3Di for dinghy sails, so we have some time to figure it out Smile

Best Regards,

Thomas Egli, Fireball International Technical Committee Chairman

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