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Old 01-20-2011, 11:14 AM   #4
Marin
Scraping Paint
 
City: -
Join Date: Oct 2007
Posts: 13,745
Anchor slot/hole

Quote:
markpierce wrote:

I don't see the functional difference between the shackle rotating on the shank or the anchor*chain rotating on the shackle.* I still think it is a marketing ploy.
If the shackle rotates or pivots on the shank, the load on the pin will always be at right angles to the pin.* There will be no shear load on the pin.* If the pin is in the shank and the load shifts out of line with the shank, which it invariably does, the chain will be angled off to the side of the anchor but the shackle will remained lined up with the shank because of the straight pin through the hole.* So the load on the pin will now be a shearing load as opposed to a straight load.

I don't see any marketing advantage to providing a slot vs a hole.* I think it's more to do with what the anchor designer felt provides the optimum setup.* I don't think it has anything to do with new generation anchor vs old generation anchor, eiher. Our POS Bruce which is now propping open a door in our garage is a very old design by today's standards and it has a slot, too, just like the Rocna.

How susceptible a shackle pin would be to damage with a shearing load is something I cannot hazard a guess on.* But it's the only reason I can think of for providing a way to attach the closed end of a shackle to an anchor as opposed to attaching the open end with a pin.


-- Edited by Marin on Thursday 20th of January 2011 01:56:00 PM
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