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Forum: Anchoring & Mooring

27-10-2019, 11:28

Replies: 16

Effect of anchor chain elasticity

Views: 2,901

Posted By thinwater

Re: Effect of anchor chain elasticity

When the load comes on hard, the bow dips.

If the boat is yawing when the rode comes tight (probably is) the boat will start to straighten out.

If a wave lifts the bow as the rode comes...

Forum: Anchoring & Mooring

26-10-2019, 20:08

Replies: 16

Effect of anchor chain elasticity

Views: 2,901

Posted By thinwater

Re: Effect of anchor chain elasticity

In fact, the stretch of rigging is well known and can actually be used to tune it, in place of a gauge. Seldon says so (see page 32).
https://www.seldenmast.com/files/595-540-E.pdf

Forum: Anchoring & Mooring

26-10-2019, 14:52

Replies: 16

Effect of anchor chain elasticity

Views: 2,901

Posted By thinwater

Re: Effect of anchor chain elasticity

Correct. I dropped a decimal. Thanks for catching it!

Corrected, my numbers were:

Elongation at the WLL:
grade 30 0.1%
grade 43 0.15%
grade 70 0.18%

Forum: Anchoring & Mooring

26-10-2019, 13:20

Replies: 16

Effect of anchor chain elasticity

Views: 2,901

Posted By thinwater

Re: Effect of anchor chain elasticity

In fact, if you had my book (Rigging Modern Anchors) this is discussed in Appendix V. I got the info from chain manufacturers. Shameless plug.

In fact, stretch does vary with the grade of steel,...

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