Vidwatts 10:37pm, 13 August 2012
I've been generally attending to the tension of Aeolus's rigging as her speed isn't what it was when I first got her from Malcolm's tender care. Must admit for the first time really paying attention to the forestay, which I'm sure wasn't tensioned sufficiently, even with the backstay tightened. (I'm also thinking about installing roller furling so was looking at it with that in mind too.)

I've posted a photo of the set-up on Aeolus and wondered how it compares to others. A couple of things occured to me:

a) There's a snap-shackle as the primary link between D-ring and forestay - it's evidently been there forever as its ring is through the D-ring itself so must have been installed together (is that an original fitting?)

b) there is a small shackle between the bottle screw and the snap-shackle - could that indicate a too-small bottlescrew, or should it be there at all?
jendave1 6 years ago
Others here far more qualified to comment, but I don't think it's a good idea to have the forestay attached with a snap shackle. Should this fail or catch & spring open you will have a real problem! May not be likely under load, but possible...
There is one on Shurig's forestay attachment point, which we have used to attach the tack of the foresail. Bottle screw is shackled directly onto the U-bolt.
I think you need to remove the snap-shackle from the forestay, which will help with getting more tension in the rig.
Mike A1 6 years ago
Amare has a similar snap-shackle on this D-ring, but it isn't used for the forestay. I have always assumed that it was to attach the foresail tack as low as possible on the deck but as I have a roller reefing geona I don't use it.

Personally I would replace both the snap-shackle and the other shackle with something more substantial, or get a longer bottlescrew and attach that directly to the D-ring.
busy home [deleted] 6 years ago
The mast is probably raked to far back with this lot.
that snap shackle should only be used to attach a sail,
Leave it there and bring the mast foreward ,, Idealy the bottle screw should go direct to the chain plate itself,,
Yes some one removed the attachment point (chain plate)and fitted the snap shackle its not standard,
admin
NormanKlipspringer Posted 6 years ago. Edited by NormanKlipspringer (admin) 6 years ago
I agree with the points made so far. Ideally the bottle screw should be attached to the u bolt, which would be the original setup. However, if the bottlescrew has been relaced witha smaller one there may not be sufficient adjustment, and it may be necessary to adjust the mast rake by using a shackle (D not snap). Have a look at the link below for Chris Butler's notes on rig tuning. www.achillesyachts.co.uk/page28.html. I have followed this with success only I use a gauge for tension. When Chris looked at my boat Archimedes one of the first things he commented positively on was rig tension.
Borrow or buy a Loose gauge to measure rig tension. It is too easy to over tension but under is not good either. Without a gauge most owners probably are under tensioned. When sailing the lee shrouds should never be slack. There should always be some tension in all shrouds at all points of sail. If any shroud is gets slack it will be subjected to repeated impact loading leading to premature failiure.
After a mast down so that the rig has to be retuned there is likely to be a period of settling so after some sailing recheck. Don't forget to always lock the bottlescrews. Either with lock nuts, sizing wire or split pins. I left mine unlocked in the yard for some time and two of the shrouds unsrewed completely by vibrating in the wind, so that the mast almost came down.
Good luck
As an afterthought have you checked the attachment support for the u bolt. Either in the anchor well (if you have one) or from inside the boat. The strap connected from the underside of the ubolt to the hull is prone to rusting and if not present will put a severe strain on the deck.
pjbharrison 6 years ago
Norman
What is the correct tension on a Loos tension gauge for an A24?
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NormanKlipspringer Posted 6 years ago. Edited by NormanKlipspringer (admin) 6 years ago
Paul,
No simple answer. Depends on racing/not racing, 5mm/4mm, uppers/lowers. The Loos gauges cover a range of wire types but unfortunately 5mm and 4mm are not covered by the same guage. I normally set mine for about 15% breaking strain which is fine for cruising. For racing you can go upto about 20%. These would give different readings on the two gauges (i.e. for 5mm or 4mm wire). You would need to refer to the tables provided with the gauges to determine the reading. I follow Chris Butler's recommendation and set my uppers, fore and backstay tighter that lowers and introduce a bit of forward prebend in the mast.
Standard rigging for an A24 is back, fore, uppers in 5mm 19 strand stainless and lowers 4mm 19 strand stainless.
Vidwatts 6 years ago
It's obvious now: that's clearly the wrong attachments. Must have been like that since the rig went back up - might explain the poor speed I've been getting out of her this season!
I've looked back through my photo archives and I can see from photo's taken when I took over her care from Malcolm that the bottlescrew attaches directly to the D-ring, so I will re-instate it in its rightful position. I will also check the backing plate.
Fortunately, this set up has survived sustained winds of 20kts + in races, with gusts over 30kts...
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NormanKlipspringer 6 years ago
It's not the backing plate that I was refering to but the attachment strap. Have a look at the following link which shows what it should be like with ply backing and galvanised strap from u bolt to hull.
www.flickr.com/photos/8165051@N06/4986842355/
Skykomish E29 Posted 6 years ago. Edited by Skykomish E29 (member) 6 years ago
the snap shackle was for the fore sail uphaul. here is the best picture we have of the original arrangement
www.flickr.com/photos/8644331@N08/3434248087/in/photostream
www.flickr.com/photos/8644331@N08/2102985053/in/photostream
Vidwatts 6 years ago
Bottlescrew attached easily enough - no idea why such a complicated previous arrangment had arisen. My only thought is that the chap I had working on the boat to add the windex to the top of the mast had just done a temporary fix which was overlooked - oops.

I have provided new photo as well as one of the underdecks attachment which does have the thick ply backing and galvanised strap - these look alright to me, but others may have comments.
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NormanKlipspringer 6 years ago
I have put comments on the photos.
Vidwatts 6 years ago
Many thanks Norman, always sensible advice on this forum, as ever :)
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