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Go Back   SailNet Community > General Interest > General Discussion (sailing related) > Caternary & Chain...
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Thread: Caternary & Chain... Reply to Thread
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Topic Review (Newest First)
11-14-2013 06:26 PM
Faster
Re: Caternary & Chain...

Quote:
Originally Posted by PCP View Post
Not completely. I have one on my previous boat just diminish the movement but I am not sure that is detrimental to safety, I mean the movement. If you go forward and look to the chain you can see that in fact the "sailing" diminishes the pressure over the chain and therefore the pulling force on the anchor.

Regards

Paulo
Agree that a riding sail doesn't eliminate 'sailing' on the hook, but it can lessen the arc, and more importantly soften the 'turnarounds'.

Our Caribbean cruising friends started using a riding sail that we gave them.. and it's still the first thing that goes up after the hook goes down. Their Bene 36.7 sailed so hard on the hook that the 'fetchup' on one end of the swing actually broke the anchor free in one instance. The boat would spring back after stretching the rode (all chain), then turn and almost sail downwind before being snatched back around.

The riding sail makes those 'fetchups' much more gentle, the bow doesn't blow as far off and they sleep better for it.
11-14-2013 06:11 PM
eherlihy
Re: Caternary & Chain...

Quote:
Originally Posted by mitiempo View Post
Just read your post as well as the rest of the thread. As far as retrieval goes I think a stainless or galvanized welded ring around the anchor rode makes for the easiest way to pull an anchor up when it will not break free. This is used on the halibut anchoring rigs that we make for fisherman. The ring can stay on the boat with the rode going through it, if large enough it can live around the anchor roller and out of the way. A light line of 1/4" size is attached to the ring. If the anchor gets stuck the ring is allowed to travel down the rode to the anchor and a pull from the opposite direction will unseat the anchor easily.

The Rocna 15 (33 lbs) is my choice for a 27' boat, currently with 80' of 5/16" g30 chain because that is what I have followed by nylon. Were I to replace the chain it would be to 1/4" G43 of 40' or 50' and nylon after that. My rig, like yours is geared for using without a windlass.

If my boat was the size of yours I would certainly have a windlass, manual or electric. I would choose a Rocna 20 (44 lbs) or a Rocna 25 (55 lbs) for a 35' boat.
When I bought the boat it came with a 25lb Delta.

That anchor was a bad joke on the bow of a 35' boat...
11-13-2013 10:56 PM
PCP
Re: Caternary & Chain...

Quote:
Originally Posted by mitiempo View Post
A riding sail set on the backstay is effective to eliminate sailing at anchor. Need not be very large.
Not completely. I have one on my previous boat just diminish the movement but I am not sure that is detrimental to safety, I mean the movement. If you go forward and look to the chain you can see that in fact the "sailing" diminishes the pressure over the chain and therefore the pulling force on the anchor.

Regards

Paulo
11-13-2013 10:54 PM
pdqaltair
Re: Caternary & Chain...

Quote:
Originally Posted by Don0190 View Post
Mine has both a chain and a rope gypsy and the rope would run in the chain section. But it never liked to turn into the hole and drop and this always seemed right about when the anchor would come off the bottom. So it just just to the point that it was better to just have chain.
Same reasoning, same solution.
11-13-2013 08:46 PM
Don0190
Re: Caternary & Chain...

Quote:
Originally Posted by mitiempo View Post
Many windlasses have a combination rope/chain gypsy and with a rope/chain splice have no problem with the transition, though I realize Don that yours is probably not this type.

Mine has both a chain and a rope gypsy and the rope would run in the chain section. But it never liked to turn into the hole and drop and this always seemed right about when the anchor would come off the bottom. So it just just to the point that it was better to just have chain.
11-13-2013 05:36 PM
mitiempo
Re: Caternary & Chain...

Many windlasses have a combination rope/chain gypsy and with a rope/chain splice have no problem with the transition, though I realize Don that yours is probably not this type.
11-13-2013 05:29 PM
Don0190
Re: Caternary & Chain...

I have 350' of all chain rode. I have never considered the all chain having any real advantage as far as holding at anchor. I do believe that it helps in normal wind shifts as the chain has to drag across the bottom. And I also believe the chain is a plus as far as chafe on rocks etc.

The real reason I have all chain is because I got tired of dealing with the rope/chain transition though the windlass.

So in the end t doesn't really matter much to me how much wind it takes to straighten the chain, I'm more interested in the anchor.
11-13-2013 04:01 PM
mitiempo
Re: Caternary & Chain...

Quote:
Originally Posted by eherlihy View Post
I posted on what I use for ground tackle, including the rode, a while back. Some of you may have seen it, some may not care to, so here is a link instead of the whole post. http://www.sailnet.com/forums/gear-m...oday-35-a.html
Just read your post as well as the rest of the thread. As far as retrieval goes I think a stainless or galvanized welded ring around the anchor rode makes for the easiest way to pull an anchor up when it will not break free. This is used on the halibut anchoring rigs that we make for fisherman. The ring can stay on the boat with the rode going through it, if large enough it can live around the anchor roller and out of the way. A light line of 1/4" size is attached to the ring. If the anchor gets stuck the ring is allowed to travel down the rode to the anchor and a pull from the opposite direction will unseat the anchor easily.

The Rocna 15 (33 lbs) is my choice for a 27' boat, currently with 80' of 5/16" g30 chain because that is what I have followed by nylon. Were I to replace the chain it would be to 1/4" G43 of 40' or 50' and nylon after that. My rig, like yours is geared for using without a windlass.

If my boat was the size of yours I would certainly have a windlass, manual or electric. I would choose a Rocna 20 (44 lbs) or a Rocna 25 (55 lbs) for a 35' boat.
11-13-2013 03:40 PM
eherlihy
Re: Caternary & Chain...

Also, for an EXCELLENT analysis of anchor and rode, see this link;TuningAnchorRode (Alain Fraysse has done the analysis, and researched the formulas, and captured it all here)
11-13-2013 03:23 PM
eherlihy
Re: Caternary & Chain...

I posted on what I use for ground tackle, including the rode, a while back. Some of you may have seen it, some may not care to, so here is a link instead of the whole post. http://www.sailnet.com/forums/gear-m...oday-35-a.html
This thread has more than 10 replies. Click here to review the whole thread.

 
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