Spinnaker pole uphaul |
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kanga
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Joined: 09 Oct 07 Online Status: Offline Posts: 248 |
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Topic: Spinnaker pole uphaulPosted: 29 Sep 09 at 4:54pm |
You can build into your hoist+drop/gybing routing, for the helm to just drop the pole height a couple of inches to make it a bit easier, and then pull it on again when necessary....... |
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Posted: 29 Sep 09 at 5:34pm |
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The link I gave (last paragraph) explains how it works. The uphaul works against the elastic to keep the pole down. If you have the uphaul/downhaul rigged as the link you shouldn't have to adjust them both when altering the pole height......unless something else is wrong, What pole system is he using, single ended, ramp thingy or hook? The system on the L2 is very similar except the elastic is on the fordeck, 6mm elastic under slight tension when not used seems fine Adjusting only the uphaul. Guy position, reaching cleat position and pole mast ring position will all effect the poles tendency to skyrocket
Edited by GK.LaserII |
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ohFFsake
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Joined: 04 Sep 08 Location: United Kingdom Online Status: Offline Posts: 219 |
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Posted: 29 Sep 09 at 9:32pm |
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On a Fifteen we have similar issues, but with bigger kite loads. The system I have found to work really well is as follows:
1. Downhaul fixed to pole, passes through an eye in the deck with a stopper knot just below, adjusted so that it comes taut at the highest pole height ever needed. 2. Under the deck a 2m length of elastic tensions the end of the downhaul along under the foredeck, so it gives a moderate but consistent downward loading. 3. Uphaul is led back to the centre of the boat where either helm or crew can reach it. This has a stopper knot limiting how low it can go, which just and so allows the pole to be put back on the boom with it released. This works well, the only downsides being that you have to set and release the pole height as part of your hoist & drop respectively; and you can't leave the height preset. You can solve both these issues by having the up & downhaul on a hook or ring that you detach when you store the pole, but that adds a different task to the procedure. It's personal preference really - one option needs better teamwork, the other gives the crew more to do. But either way, the elastic downhaul with a positive limit seems to work really well when the kite is up. The pole can't sky uncontrollably, and usually we find when reaching the problem is how to raise the pole, rather than how to stop it skying! |
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Mikey 14778
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Joined: 05 Feb 09 Location: United Kingdom Online Status: Offline Posts: 298 |
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Posted: 29 Sep 09 at 10:41pm |
Why not ? If you have the pole uphaul exiting from the mast at the correct height, you can have the pole park on the boom exactly along it without adjusting the pole uphaul when you launch/retrieve. Obviously you'll affect this a bit with the uphaul adjuster, but it's perfectly feasible to have the pole launch at a standard height for (say) reaching direct from the boom. Or at least it is on a Fireball. I can't see why a Fred should be different as long as class rules permit you to put the sheave for the uphaul at whatever height you like on the mast. PS, good link GKLaserII, I wrote that stuff. Fame at last
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redback
Really should get out more
Joined: 16 Mar 04 Location: Tunbridge Wells Online Status: Offline Posts: 1502 |
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Posted: 30 Sep 09 at 12:33am |
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If you are good at geometry you can work out where the top achorage should be so that the pole lies exactly along the boom and yet is at the optimum height when deployed. Use elastic to hold the pole up and rope to hold it down. The last thing you want is the pole going skyward in the gusts so don't use elastic to hold it down. As you probaly know the hooks should always point upwards as its easier to release the pole that way since the pole generally inclines upward in a strong breeze. I'd suggest velcro on the pole and the boom so that the pole doesn't rattle about when stowed. With a smple cleat for the rope downhaul you have a light and uncomplicated arrangement with minimum windage and weight. |
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Posted: 30 Sep 09 at 9:33am |
What is recommended by a particular class (and it's members) is probably the best way to go. I know Mirrors do it the other way......but the Fireball people recommend the elastic on the down haul. I don't think they would do that if it didn't work. The elastic doesn't hold the pole down anyway (although it may help very slightly), It's function is to take up the slack when adjusting/deploying the pole. It also allows some give in the system if things go wrong......The angle of the guy relative to the pole/mast pivot point is what keeps the pole down. The reaching cleat makes the angle steeper thus increasing the downward force on the pole. Edited by GK.LaserII |
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