On the contrary, for cruising, the high clew reduces slightly performance, but also allows to furl several turns without having to change significantly the position of the traveller.
Phil
Post generated using Mail2Forum (http://www.mail2forum.com)----- Original Message -----
From: whiteede (forum-general@swift18.org)
To: forum-general@swift18.org (forum-general@swift18.org)
Sent: Tuesday, April 06, 2010 3:55 PM
Subject: [Swift 18] Re: How far can one go .... over?
Thanks very much indeed for that info Phil. Whilst I understand the ref to a high clew/traveller position I am intrigued by the sail design importance given to a low clew, i.e. fairly level foot for efficiency of wind utilisation. Is this too extreme in relation to use on a Swift?
Philip ‘nuestro’
From: Phil De Troy [mailto:forum-general@swift18.org]
Sent: 06 April 2010 14:20
To: forum-general@swift18.org (forum-general@swift18.org)
Subject: [Swift 18] Re: How far can one go .... over?
Genny, force 6... don't be surprised if something wrong happens.
Such a rig is weak when you need to have control of the forestay tension, and a genua should be furled soon.
Only the Challenger Micro has a similar ratio genua/main
A 7/8 rig can usually sail properly with mainsail only. The furling working jib 5.6 sq.ft / 5.20 sq.m as described in the technical section of the Web site is certainly not the best option.
Based on a mainsail 94 sq.ft / 8.73 sq.m, the maximum genua should be 105 sq.ft / 9.27 sq.m.
The drawings are showing a non-furling "high aspect", very good sail and no problem for tacking.
This sail could be adapted to furling according to following rules :The genua becomes an additional sail, lighter, for winds up to force 3, no more, with cable in the luff (now very flexible with Dyneema), no hanks or attachment to the forestay. You can use the sail with a tack line (tension with blocks), hoist with a strong spinnaker halyard or a second headsail halyard (useful also for a heavy weather sail).
- luff length same as genua
- longest perpendicular 70% of the genua (area 70 to 75 sq.ft)
- higher clew, so there is no need to change the position of the traveller (or attachment point of the sheet block). It helps also having a good view in the dead angle.
The furling high aspect jib shouldn't be used with more than 3 turns, more only in an emergency.
You should reef only after the first turns.
If you need to tuck the second reef, then consider changing the furling jib to a heavy weather jib, no more than 50 sq.ft, also with high clew. The sail can be hoisted from the cockpit, like the genua.
For very bad conditions, you could also une a real storm jib, the standard area is 30 sq.ft, strong cloth, can be red or orange colour...
The best I can wish you is to have the stormy on board, but re-sell the boat many years later with this sail unused.
Phil
Phil De Troy
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----- Original Message -----
From: whiteede (forum-general@swift18.org (forum-general@swift18.org (forum-general@swift18.org)))
To: forum-general@swift18.org (forum-general@swift18.org) (forum-general@swift18.org (forum-general@swift18.org)) (forum-general@swift18.org (forum-general@swift18.org (forum-general@swift18.org)))
Sent: Tuesday, April 06, 2010 1:39 PM
Subject: [Swift 18] Re: How far can one go .... over?
From my own experiences I agree with Tony - AFG. The Genny is too powerful to aid quick tacking, or sometimes even achieving tacking, and you certainly round up into the wind from a broad reach in a strong wind (force 6 gust for sure). I am going to have a new jib made but haven't yet checked out our triffic site info on what size is good. I have been musing on two things lately i) raking the mast a little to improve upwind and ii) moving the slightly annoying cockpit sheet attachment. I have wondered if a cable horse across the stern would answer- as you get in an Enterprise dinghy. You would need clips to limit traverse of the block. I welcome comments too.
Philip of Nuestro
Phil De Troy [url=http://www.MicroClass.org]www.MicroClass.org