Thread: Sail Design for the GIS

Originally Posted by Boatmik

Girfriends of different weights carrying an assortment of 10, 15 and 20 litre buckets full of water (in case the spars need testing.

I would love to see this on a sailing day.

The closest we have got was the PDRacer that was launched in the Philippines by Dylan


I think the girls would be dressed rather differently in Europe at the moment.

MIK

And for the buckets, if the wenches could carry an assortment of these, they would do just admirably...

Gonna have to get a bigger boat. A cuddy cabin could be useful...

I'm comin' to Oz and building a PDR!!!!! Great shot as we freeze here in Maine...

Okay, so I want to contact Chuck at DuckWorks re a sail and get an updated quote if need be.

If I send the pdf of the simplified sail (attached to post # 4 above) and these comments will that cover the specification/description of the sail adequate;y? ( I can attach the file to an email but cannot figure out how to attach a pdf to this post.)

Text to be sent to DuckWorks:
GIS Simplified Sail (PDF)

Loose footed (no need to install lacing eyes on foot)
3 Reef points allowing sail to be reefed from the full 9.65 square meters to

1. Approximately 8 square meters, then to
2. Approximately 6.5 square meters, then to
3. A very high reef point.

No Battens

This from Mik regarding the depth of the sail:

I would...suggest increasing the depth of the sail by an extra 1/3 in section by the yard.



OR...


Would I be better off just forwarding the pdf (which shows only 2 reef points but at different points than the original sail) and eliminating the description of the 3 reefs? I do not want to complicate things from the git-go...


My expectation is to race my Goat in mixed fleets using the Portsmouth Yardstick. Winds in the racing venues will range from light (4-7knots) to fairly heavy (18-20 knots, with higher gusts).



Or, do I just order the standard Duckworks sail and learn to sail it (I've sailed quite a bit but have never sailed a lug rig.) before into sail refinements?


Thanks. I'd like to send Chuck an email before the end of the weekend, so input will be appreciated sooner rather than later.

Howdy BobWes,

The standard Duckworks sail with the revised reefs. Probably recommend that the camber of the head be increased by +3%.

So if it is a flattish 6% it will be up around 9 after. Might be good to check whether this seems sensible to Joost.

Don't give them the head round info ... it means they are starting from scratch rather than utilising their own knowledgebase.

Not many "in between" eyelets for the reefs - maybe three per reef. May as well minimise pressure leakage.

Michael.

Just emailed Joost with a link back to the post above.

MIK

Thanks, Mik.


So, does this cover it?



Please provide a quote for a standard GIS sail with the following modifications:

1. Please add a reef point 690mm from foot (for a total of 3 reef points)
   
2. Provide three eyelets/grommets per reef point
3. Increase the depth of the sail by 3%
4. No lacing eyelets necessary in foot (sail will be rigged loose footed)
5. No battens

Thank you.

The only item I'm not clear on is the number of eyelet/grommets for each reef - 3 or 5 per reef?

And what weight sail cloth should I be buying? 3.5, 4.9, or 5.5 ounce white Dacron?

I'll wait for Joost to chime in before finalizing this.

Thanks.

Hello,

My thoughts:

• I assume the 690 mm would give appr. 8 m2 for the first (additional reef).
• I just counted the grommets in my first set of reef points. I have 4 next to 2 big stronger reinforced eyelets to tie the sail to the spar ends. 4 grommets in between the eyelets seems to be sufficient, although it might be worthwhile to have them installed in such way that the first grommet is relatively close to the luff (to keep the reefed part of the sail tight together as the wind catches this part easily).
• I would think that this depends on the flexibility of the yard. If using the standard one, this would probably be the way to go.
• On your stiff box boom this is possible. If the boom was mine, I would attach the outhaul in such way that the tension can be easily adjusted allowing you to trim your sail to the conditions.
• I have used the battens in the beginning, but my sail sets a lot better without them so I am not using them any longer.

I have the standard Duckworks sail for the Goat with 2 sets of reef points, white Dacron 3.8 oz. It is a light sail cloth, but I have not complaints so far with regard to durability. I must say that I am impressed by the overall quality of the Duckworks sail.

Hope this helps.

Best regards,

Joost

Bob Wes,

Please provide a quote for a standard GIS sail with the following modifications:

1. Please add a reef point 690mm from foot (for a total of 3 reef points)
   
2. Provide three eyelets/grommets per reef point apart from the main reef eyes in Luff and Leach.
   
3. Increase the depth of the sail by 3% - the standard sail is well shaped but maybe around 6% draft to chord in the top third. To bring it up to 9% would be about right.
   
4. No lacing eyelets necessary in foot (sail will be rigged loose footed)
5. No battens

Thank you.

Joost and Mik,

Thanks for the input. I appreciate the help.

I'll send an email to Chuck to request a quote.

Bob, What weight are you going for...I need to order a sail or two, too and maybe that will help Chuck.

Clint, I'm going to order the 3.8 oz. white Dacron.

I just did a quick quote to see what a sail would cost for 4.9 oz and it is very reasonable. I am juggling between 3.8 and 4.9 oz...I'm also thinking on my boat to give the sail some roach and use leech battens. I am leaning towards lacing the boom and keeping things simple...I rarely tweak my outhaul on my 11' dinghy, but may be inclined to on the Goat. How are people planning to rig the outhaul so it is easy to get to? Leading it forward to the mast I presume so it is accessible when running.

Clint, I haven't gotten far enough along in my thinking to figure out how I'll rig the outhaul. Running it forward makes the most sense.