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Forum: Anchoring & Mooring

14-04-2016, 20:09

Replies: 45

Over-specifying a Rocna anchor on a cat

Views: 11,294

Posted By Stumble

Re: Over-specifying a Rocna anchor on a cat

I was able to track down the expected holding power of the original Ronca by weight and included it below. Keep in mind that the holding power of the chain cantenary we discussed above was about...

Forum: Anchoring & Mooring

14-04-2016, 19:01

Replies: 45

Over-specifying a Rocna anchor on a cat

Views: 11,294

Posted By Stumble

Re: Over-specifying a Rocna anchor on a cat

Anchor buddies, kellets, and the like are as close to worthless as you get...

Mathematical models prove that the closer to the anchor these are placed the better they function, but even better...

Forum: Anchoring & Mooring

13-04-2016, 23:53

Replies: 45

Over-specifying a Rocna anchor on a cat

Views: 11,294

Posted By Stumble

Re: Over-specifying a Rocna anchor on a cat

If you feel you need more cantenary just add more chain. The relavent formula is

Catenary Force in kg = Specific chain weight x (chain length)2/(2 x Depth)

So using the above chain options,...

Forum: Anchoring & Mooring

13-04-2016, 18:16

Replies: 45

Over-specifying a Rocna anchor on a cat

Views: 11,294

Posted By Stumble

Re: Over-specifying a Rocna anchor on a cat

The cantenary (spring ) is gone typically by 30kn after which the heavier chain provides almost zero mathematical benefit let along practical benefit. Assuming the anchor system is weight limited,...

Forum: Anchoring & Mooring

13-04-2016, 14:14

Replies: 45

Over-specifying a Rocna anchor on a cat

Views: 11,294

Posted By Stumble

Re: Over-specifying a Rocna anchor on a cat

No boat has ever been lost because of too much holding power. Go with high strength chain to reduce weight and use that weight to buy a bigger anchor.

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