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| Laser 140101 Tynemouth |
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| Laser 28 - Excellent example of this great design Hamble le rice |
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| Rossiter Pintail Mortagne sur Gironde, near Bordeaux |
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List classes of boat for sale |
Fast pins? |
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winging it 
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Joined: 22 Mar 07 Online Status: Offline Posts: 3958 |
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 Topic: Fast pins?Posted: 06 Nov 12 at 4:48pm |
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http://sailsportmarine.com/index.php?main_page=product_info&cPath=108_126&products_id=550 
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the same, but different...
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Medway Maniac
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Joined: 13 May 05 Location: United Kingdom Online Status: Offline Posts: 2788 |
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Posted: 24 Oct 12 at 1:19pm |
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The lowers restrained the mast up to the gooseneck, whereas the rest of the mast went over the side = new mast required. Had we not had lowers, it would have been harmless enough once we'd stowed the kite...
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RS400atC
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Joined: 04 Dec 08 Online Status: Offline Posts: 3011 |
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Posted: 24 Oct 12 at 12:59pm |
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I suspect that is because the terminal on the end of your shroud was not exactly what the fitting was designed for? Maybe that fitting was designed for a talurit eye? If you put a bush or a bunch of M5 washers on that top pin, it reduces the gap to something an eye terminal won't be pulled through, but you have to ensure the wire runs straight, not deflected by the bush, or it may fail. |
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winging it
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Joined: 22 Mar 07 Online Status: Offline Posts: 3958 |
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Posted: 24 Oct 12 at 12:06pm |
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we always had the fast pins tied in with little bits of string. Changing rake on the water is ok when you've done it a few times, and often worth it eg if you're out all day and a big sea breeze comes in or somesuch. We would also go up on the foredeck or spi pole to change spreader angles.
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the same, but different...
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Phil_1193
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Joined: 07 Jan 10 Online Status: Offline Posts: 78 |
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Posted: 24 Oct 12 at 11:49am |
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When the quick pin comes out the shroud is under tension and just pulls past the top pin. I know this because it happened to me on Sunday whilst going up wind, quick pin came out, big bang and floppy shroud. Luckily the mast didn't just fall over, it stayed upright on the lowers so I was able to tie the shroud and get home! |
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Roger
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Joined: 23 Mar 04 Location: Somerset Online Status: Offline Posts: 524 |
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Posted: 24 Oct 12 at 11:31am |
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Here the top pin is offset to avoid the abrasion.
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JimC
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Joined: 17 May 04 Location: United Kingdom Online Status: Offline Posts: 6662 |
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Posted: 24 Oct 12 at 11:28am |
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I'd be rather wary of doing that. Drilling holes means (of course) that you are taking metal out of the fitting which must reduce strength. You have to be very sure that you are not just creating a new weakness. A "perfect" shroud plate would have no more metal in the plate than is needed to cope with the maximum load transmissable through the pin. I have never done the sums to see how much reserve strength the plates have against the pins, but I hope there isn't a great deal, 'cause if there is then the fittings are heavier and thus more expensive than they need to be to do fulfil the designed task. |
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Roger
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Joined: 23 Mar 04 Location: Somerset Online Status: Offline Posts: 524 |
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Posted: 24 Oct 12 at 11:27am |
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That isn't the Rhonstan adjuster refered to earlier, and thats probably why it failed, the Rhonstan adjuster has the top pin offset to avoid that abrasion and keep the shrouds inline.
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Andymac
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Joined: 04 Apr 07 Location: Derbyshire Online Status: Offline Posts: 852 |
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Posted: 24 Oct 12 at 11:22am |
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That's interesting to share.
It seems as though something added as a safety feature could have actually ended up causing a failure. What was the damage when the rigging failed? Just a suggestion, at the dinghy ex. I noticed a Scorpion with adjustable rig (string/wire) there was a wire safety strop though the shroud eye/U bolt in case of failure. Whether you use fast pins, or clevis pins, maybe some sort of soft secondary safety leash would be better to save the rig rather than a 'safety' top pin which could deflect the shroud under load at or around its weakest point where it is swaged.
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Medway Maniac
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Joined: 13 May 05 Location: United Kingdom Online Status: Offline Posts: 2788 |
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Posted: 24 Oct 12 at 10:53am |
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Regarding the extra pin at the top of the adjuster, rather than fast pins:
I've had a shroud fail at the lower splice and had to wonder if it wasn't because I had an extra pin at the top of the adjuster that caused the shroud to bend round it under load.
The shroud pin was in the aft row of holes so that the natural shroud line exited the plate along the aft edge rather than the top, but the extra pin at the top prevented this alignment. It seemed to me that by bending the shroud close to the splice, some strands (on the outside of the bend) were placed under greater load than others, which may have led to the failure. Otherwise the splice looked good, with the ends of the strands projecting from the ferrule:  |
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