|29th July 2010 11:34 PM|
I think it might be more helpful to explain how to notice/recognize the worst rigging mistakes...
about rigging the sail here's a nice one: http://www.guycribb.com/userfiles/do...%20Outhaul.pdf
|17th July 2010 11:37 PM|
- way too little downhaul (usually 5cm or more)
- way too wide harness lines (2-3 handwidths, due to point above)
- mast too low (or even better : 3cm change won't make a difference anyway...)
- almost 0 MPF -> "oh there's too much wind", or "I can't plane through my gybes"...
|17th July 2010 05:21 PM|
|Farlo||Hi Kiwiben, if you have 25+ and 40+ days quite often you should not worry too much of riding small boards - though I agree with all Basher says. Too small board is common mistake for us poor inland/summer sailors fighting regularily with unsteady 12 Kts. This been said an extra float of ~30 liters is large enough to face most situations and remains controllable when the wind picks up.|
|17th July 2010 12:42 PM|
Don't shut up Basher, that is brilliantly written and all very useful stuff for me, and hopefully others. Keep it coming...
So, at 104kg should I throw away my little wave board? I only ever use it in like 40 knots...
Should I throw away my hypersonic 105 too? I use that in 25+ knots.
By your advice my Carve 121 should be my smallest board, correct? In actual fact it is my biggest. Bugger!
This is very useful news to me if it is true. I thought being awesome meant using a board many litres less than your kilos. But don't get me wrong, I only use my smaller ones when the wind gets me planing straight away... maybe there is no problem in that case.
Thanks again though for that reply, Ben
|17th July 2010 04:27 AM|
I don't post on here much but as someone who used to work for a sailmaker, I'm a bit horrified by some of the answers to this thread.
The batten thing, for a start.
Battens are there to hold the leech away from the luff and to stabilise the panels of the sail. The top battens support the head (roach) of the sail. The stiffness of the battens helps with the stability of the sail.
But the batten tensioner on rotational sails is just there to take the wrinkles out of the sail panels and no more. Extra tension tries to overstretch the batten pocket and wrongly pre-tensions the batten with compressional load which only encourages the batten to bend – which you don't usually want. So set your battens just lightly tensioned to minimise creases in the sail. The batten tensioner is not a tuning device.
Camber-induced sails are slightly different in that the batten tensioner can push the batten end onto the mast. So extra tension here can change the front shape of the sail by pushing in more fullness in the luff via a hingeing cam. Over-tightening these cam battens can in turn make the sail difficult to 'tack' or rotate.
Having said all that, most cams are now sewn into the sail or else pushed snuggly onto the forward end of a fixed length batten pocket – so again, batten tension doesn't do much more than try to stretch this batten pocket, usually with no good outcome.
On the cam'd sails I use, I can increase the cam pressure on the mast by fitting a plastic 'spacer' between the cam and forward batten pocket end. This spacer is the tuning device, not the batten tensioner.
As far a downhaul goes, it is true that most people still learning don't go far enough with downhaul tension when rigging their sails.
However, I also see a whole generation of sailors on some beaches who are so frightened of not having enough downhaul on their sails that they downhaul them far too much. – And then they wonder why the sail has no power in lighter winds.
If you want to get to the truth about downhaul it's simply that this tension bends the mast to release or twist the leech on the beach. When you sail however, your body weight hanging of the rig bends the mast further to one side and the leech tightens under this sailing load. Heavier sailors load their masts more, often using larger sails, and so they need more downhaul tension than lighter sailors.
The key to good rigging is feel. Learn to feel if your sail is not working properly. If rigged well it should feel light in the hands but still powerful in the wind lulls. The drive should be constant, with your harness lines staying on one place – opposite a stable centre of pull.
So downhaul – and outhaul – ARE your sail tuning devices.
One other issue here: I see many sailors on boards way to small for them.
Unless you are riding big waves or sailing in strong winds there is no need for you to be on a sinking board. Make sure your board floats you when the wind drops, with plenty of buoyancy under the straps.
The key, even for a wave board, is to be honest about your body weight and make sure you have 'positive float' by sailing a board with a volume in litres that is at least equal to your body weight in kilos. Add 5 or 10litres volume to float the weight of the rig too.
Modern designs handle wind and water conditions well without sinking in the water. And just because you loved your 70 litre waveboad when you were 18, doesn't mean you can sail the same small size board when you are 35 (and usually a lot heavier). Float is your friend.
The worst thing we see all the time is big people on sinky boards not planing. They then fit over-size fins to their boards in the hope of planing or staying upwind. In fact a board that planes early does so through positive buoyancy, and it is you planing easily that will get you upwind, not an oversize fin on a sinky board that won't plane in the first place.
I'm lecturing now, so I'll shut up.
|16th July 2010 11:54 AM|
Most modern cammed sails will rotate fine no matter how much or little batten tension is applied b/c cam pressure and batten tension are not tied together when cams are of the non-compression variety. This assumes the ideal mast. Any variation in mast flex can change the outcome, of course.
Batten tension is necessary to achieve enough skin tension that will allow the leech tension to work as intended. Much of a sail's feel is a combination of skin tension and leech tension. Insufficient batten tension will cause the draft to move up the sail as well as aft. High batten tension often will highlight an asymmetric feel to the sail -especially where the batten tension system isn't compressing from the center of the batten.
|11th July 2010 01:07 PM|
Ba dum bum bum...
|11th July 2010 03:27 AM|
|Unregistered||Glad your butt still worked !!!|
|9th July 2010 07:55 AM|
my biggest rigging mistake so far ...
not checking my gear more and at the same time trying to take a short-cut
rigged the boom a bit high and rather than going in - since water is low and a big walk out , rocks, etc, I tried to move it on the water. this worked with some force. took off , planing et al and suddenly flat on my face on the deck
the knot on the boom head came off - was tied too close to the end
swam it in and put it on and thought all was okay
nope - harness hook had punched a hole on the deck
lesson learned - take time to check and double check and no short-cuts
only $60 repair and done within one week - no loss of w/s days except the one where it broke.
was also on-call and had the pager in a double baggie. pager was wet, butt still worked :-) damn :-)
|8th July 2010 04:14 AM|
|vikingsail||I'll correct my statement, on camless sails make sure the battens are tight enough.|
|This thread has more than 10 replies. Click here to review the whole thread.|