[C38] tide reversals in SFB
dickkilroy at comcast.net
dickkilroy at comcast.net
Mon Aug 10 14:36:01 EDT 2015
Tom & Chuck:
Couldn't agree more, having lived 13 winters in Carribean on the hook with an all 5/16 chain rode. Do have a short ( 10 Ft or so ) 5/8" nylon snubbing line with a chain hook.
Dick
----- Original Message -----
From: "Charles Finn" <charles at finn.ws>
To: "Catalina 38 Listserve" <listserve at catalina38.org>
Sent: Monday, August 10, 2015 1:44:35 PM
Subject: Re: [C38] tide reversals in SFB
Tom,
I too hear time and again about how chain jerks them around when my
experience is rope is the uncomfortable ride! One also has to wonder
how folks on rope are able to anchor these days around other boats that
have moved to chain... The math is pretty clear that you need a whole
lot more rope vs chain and when the boats do their tidal dance... the
guy on rope is going to cause problems for the rest!
My basic rule of thumb is to have 3x the chain as the depth I normally
anchor in. 5/16" chain is about right for our boats.
For those who want to go to the source: Buy the Complete Anchoring
Handbook: Stay Put on Any Bottom in Any Weather. By: Poiraud, Alain;
Ginsberg-Klemmt, Achim. 250 pages of anchoring analysis and advice
that you just won't be able to put down if you are as crazy as I am!
By the way, my next anchor absolutely will be a Rocna 44 lb. $400 is a
steep price, but a good night's sleep is priceless!
Chuck Finn
Mighty Quinn #114
Great Lakes
On 8/10/2015 1:11 PM, Tom Troncalli wrote:
> I was on a friend's boat once in the Bahamas and we entered an
> anchorage during a summer squall. We motored to weather to drop the
> hook and we let out considerable nylon rope rode. We went about
> getting supper ready, etc., but the surge on the rode kept everyone
> falling all over the place as waves came into the cove where we were
> anchored.
>
> The owner of the boat finally had enough of this mayhem and decided to
> motor forward toward the anchor and replace that anchor with one with
> a total chain rode.
>
> We swapped anchors and rodes and the boat settled down like it was
> beached on high ground. The chain held us in place so the wave action
> didn't push the boat rearward which allowed a much more comfortable
> situation. Because the anchor rode was total chain, we didn't have to
> worry about getting fouled in a tide reversal as we had on previous
> occasions.
>
> After that experience, we always either used a total chain rode or a
> very long chain rode to rope rode where it transitioned via a swivel.
> On my boat I used an over sized swivel between the chain and rope to
> help act as a kellet weight.
>
> Another friend who claimed to have a lot of sailing experience said he
> would never use a total chain rode because it would be too jerky when
> the boat pitched against the waves, just the exact opposite of our
> experiences. I doubt he had ever experience a chain rode.
>
> If you tie to a dock with short chains, jerky shocks would be true but
> with a long rode of chain to an anchor, the catenary, or gravity sag,
> in the rode path to the anchor, gives enough shock absorption to keep
> the boat safely in place without jerking. A nylon rode will stretch
> when waves hit causing an elastic surge forward during troughs between
> the waves.
>
> The weight of a chain anchor rode also keeps the anchor pulling
> horizontal so holding is greatly improved even with a relatively light
> anchor and any kellet along the rode helps even more.
>
> I know I am "preaching to the choir" with most if not all of you but I
> am amazed at how many people have the wrong ideas about chain anchor
> rodes and kellets.
>
> Tom Troncalli
>
>
>
>
>
> On 8/3/2015 4:50 PM, Michelle wrote:
>> After some net surfing and post-event debriefing, we've learned (a)
>> we need more chain rode and (b) we need a 15-20lb kellet to weigh
>> down the rope rode and theoretically keep it plumb and away from the
>> keel at turning tide.
>>
>> After the first mishap, I downloaded a free anchor dragging app to my
>> iPhone (Drag Queen) and set it so we could get some sleep. It woke us
>> for the second wrap and drag.
>>
>> We've anchored Dulcinea at Clipper Cove, Treasure Island and didn't
>> have this happen. Perhaps we've been lucky the lee of the island is
>> more protected from tidal flux than San Pablo Bay. We've anchored our
>> Ranger 23 in many places and have never had this happen to Rigel.
>> Lessons learned! The only fouls were, well, the anchors, and we
>> snapped one of our winch handles trying to grind in the hooks on our
>> manual windlass that has no mechanical advantage, straight 1:1. Woof.
>>
>> We've now downloaded a book on anchoring to learn more and will
>> definitely go back to China Camp, with more knowledge and more tackle
>> tools better prepared next time!
>>
>> :)
>> MD
>>
>> Michelle Diaz, BSN, RN
>> C38 Dulcinea #110
>> Sent from my iPhone...
>>
>>> On Aug 3, 2015, at 13:33, Don Strong <drstrong at ucdavis.edu> wrote:
>>>
>>> Michelle: Great story, and sorry about your tangle. We had 4
>>> reversals during a night anchored at China Cove of Angel Island. The
>>> GPS alarm awoke me for the first two, and I happened to awake during
>>> the third, about 4 am. The final reversal came during morning
>>> coffee. No anchor drags, we were lucky.
>>> SFB tidal currents are wicked.
>>> Don, C38 Discreet Charm, Emery Cove
>>>
>>> On 8/2/15 11:53 AM, Michelle wrote:
>>>>> We anchored out last night in the San Pablo Bay muck in the lovely
>>>>> general anchorage outside McNear's Beach, China Camp State Park,
>>>>> Marin County, CA with a 33lb claw anchor with 25' chain and 110'
>>>>> of rope rode. Twice in the night (once around 00:30 ~3 hours after
>>>>> setting anchor and 2hrs to high tide, the other this morning
>>>>> around 8:30a) Dulcinea had spun herself and wrapped her ground
>>>>> tackle around her keel and dragged anchor. It was no fun trying to
>>>>> undo the mess, twice. Thankfully we have a backup danforth that we
>>>>> dropped to slow the drag and give us time and slack on the primary
>>>>> tackle to untangle the keel.
>>>>>
>>>>> Anyone have this happen to them? Any thoughts? We've never had
>>>>> this happen to us on our other boat.
>>>>>
>>>>> :)
>>>>> MD
>>>>>
>>>>> Michelle Diaz, BSN, RN
>>>>> C38 Dulcinea #110
>>>>> Alameda, CA
>>>>> Sent from my iPhone...
>>>> _______________________________________________
>>>> Listserve mailing list
>>>> Listserve at catalina38.org
>>>> http://catalina38.org/mailman/listinfo/listserve_catalina38.org
>>>
>>> --
>>> Donald R. Strong
>>> Professor,
>>> Department of Evolution and Ecology
>>> and
>>> The Bodega Marine Laboratory,
>>> University of California, Davis,
>>> Davis CA
>>> 95616
>>> 530 752 7886
>>>
>>>
>>> _______________________________________________
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