Clevis pin clips on Sailman 3000 issue. Better ideas?

MoodySabre

MoodySabre

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I have Sailman 3000 batten fittings that have a SS strap (saddle) that goes round the sail slug and fixes to the connector arm on the batten holder with a clevis pin secured by a small keyring type clip. The inside end of the clip has a turn in it presumably to make it more secure.

Motoring out of Rotterdam there was a clink splash as something went overboard and it turned out to be the clevis pin and the saddle jumping ship.

I have now obtained the bits and fitted them but looking at the other clevis pin clips I see that they are all beginning to stretch. So a better solution is required. I dont want split pins or anything with a sharp end as the sails will get ripped. I'm thinking bolt with a nyloc nut and a hole through the bolt for a clip as a fallback. Plus regular inspection.

Any better ideas?
 
I'd agree with the bolt and nut idea, it was what I was going to suggest until I saw you already had :)

Personally I wouldn't bother with the additional clip if the nut is a nyloc. You'll need to get the length of the bolt just right though, so that it fully engages with the nylon but doesn't protrude far enough to rip the sail. Dome nuts would be better from a non-ripping point of view, but then you lose the self-locking facility (I've never heard of nyloc dome nuts).

Pete
 
prv said:
I'd agree with the bolt and nut idea, it was what I was going to suggest until I saw you already had :)

Personally I wouldn't bother with the additional clip if the nut is a nyloc. You'll need to get the length of the bolt just right though, so that it fully engages with the nylon but doesn't protrude far enough to rip the sail. Dome nuts would be better from a non-ripping point of view, but then you lose the self-locking facility (I've never heard of nyloc dome nuts).

Pete
Click to expand...

But Loctite 243 is your friend.......
 
MoodySabre said:
I have Sailman 3000 batten fittings that have a SS strap (saddle) that goes round the sail slug and fixes to the connector arm on the batten holder with a clevis pin secured by a small keyring type clip. The inside end of the clip has a turn in it presumably to make it more secure.

Motoring out of Rotterdam there was a clink splash as something went overboard and it turned out to be the clevis pin and the saddle jumping ship.

I have now obtained the bits and fitted them but looking at the other clevis pin clips I see that they are all beginning to stretch. So a better solution is required. I dont want split pins or anything with a sharp end as the sails will get ripped. I'm thinking bolt with a nyloc nut and a hole through the bolt for a clip as a fallback. Plus regular inspection.

Any better ideas?
Click to expand...
Using bolt with thread instead of clevis pin...
Be careful - threads weaken the pin and create wear on the mating surface.
To maintain the designed strength you must find or make bolts where the thread limited to the unloaded part of the bolt.

The use tape to secure / protect the keyring or split pin. If you dislike insulating tape you can use self amalgamating tape.

This picture illustrates the thread "problem", what we find on boats where clevis pin's are used is on right hand side of the drawing.
FIGURE-7.1-Two-main-types-of-construction-with-high-strength-bolts..jpg
 
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The nuts cannot be tight as there has to some movement so perhaps changing the clips regularly is the answer. I spoke to Crusader and they are sending me some new clips FOC even though the sail is 3 years old.

Thanks everyone.
 
You say that all of the clevis pin clips are beginning to stretch. This suggests that there are some highish forces at work - if they're being distorted parallel to the axis of the clevis pin then perhaps there's excessive clearance developed between the pin and the holes in the batten car system. The pin should be there primarily to resist shear but wear could introduce longitudinal forces.
 
reeac said:
You say that all of the clevis pin clips are beginning to stretch. This suggests that there are some highish forces at work - if they're being distorted parallel to the axis of the clevis pin then perhaps there's excessive clearance developed between the pin and the holes in the batten car system. The pin should be there primarily to resist shear but wear could introduce longitudinal forces.
Click to expand...

Crusader thought it strange as well. There is no wear on the clevis pins and I can't see why the rings would stretch. Another thing to monitor!
 
MoodySabre said:
Crusader thought it strange as well. There is no wear on the clevis pins and I can't see why the rings would stretch. Another thing to monitor!
Click to expand...

The most common cause if these key rings to open up - is getting snagged by a rope or something else.
Protecting with tape solve the snagging problem.
 
knuterikt said:
You can use normal bolts of these bolts - but still you need bolts where the load carrying part is without threads.
If you cant find stock bolts with correct un-threaded length you can buy over length bolts and cut threads to fit (Good luck :)
Click to expand...


Yes you could do that but you cannot lock the nut up tight so precisely as the nut locks up against the end of the thread and not a fixed shoulder.
 
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