I completely agree with Mark's comments about chain--the big advantage is chafe protection in areas where there is coral and not the shock absorbing of the catenary effect. Actually, you need a snubber made from nylon rope to get any significant shock absorbing benefit.
I have one rode with all chain and I made a snubber for this rode. My secondary anchor has 40 feet of chain and the remainder is rope. Both anchors are 44-lb. This anchor system is setup for the Bahamas. I just added a windlass for my primary anchor with all chain rode. If I thought I could get by with a 33-lb anchor I would not have added the windlass. On the Chesapeake Bay I used a 33-lb anchor with 10 feet of chain for over 20 years but the holding is generally very good. Bob Bob Boyer S/V Rainy Days (1983 C&C Landfall 38 - Hull #230) Blog: dainyrays.blogspot.com Email: dainyr...@icloud.com Annapolis, MD (presently in Baltimore) > On Aug 17, 2016, at 1:00 PM, Dr. Mark Bodnar via CnC-List > <cnc-list@cnc-list.com> wrote: > > > I can't offer up anywhere near the experience of others on this list - so I > depend on learning from more experienced sailors. This group is part of > that, plus I pay for a membership with Attainable Cruising Adventure - > https://www.morganscloud.com/ - lots of great info that has been tried and > tested in challenging climates (including an extensive discussion on > jacklines and tethers) > On the topic of catenary effects of chain - they argue that the effects are > pretty minimal. This article is offered as evidence of the calculations. > Chain still offers some benefits, just not so much in catenary effect. > http://www.petersmith.net.nz/boat-anchors/catenary.php > > Mark > There is no cure for birth and death save to enjoy the interval. > - George Santana >> On 2016-08-17 11:18 AM, Chuck Gilchrest via CnC-List wrote: >> Chuck, >> Avoiding chain on anchor rode means you’re giving up one of the most >> important aspects of the rode: the catenary effect of shock absorbsion. By >> allowing some of the chain to lie on the ocean (or lake) bottom, the effort >> that it takes to lift the chain off the bottom before the line goes taut, >> serves as a shock absorber to wave, wind, or current. Also, using chain on >> an anchor rode means you can get by with a somewhat shorter scope in a >> crowded anchorage without worrying that your anchor will break free. >> Using only rope between your clean and the anchor allows for very little >> catenary and as such, your cleat and the anchor rope is bearing the entire >> shock load of the boat all the time. If I had only rope on my anchor line, >> I would make sure I had a proper anchor rode snubber, rubber or otherwise, >> to manage those loads. >> On Half Magic, we use 25’ of 5/16” Galv BBB chain spliced to 200’ of 5/8” >> NovEight Novabraid 8 plait rope with a 25lb CQR anchor (which is probably a >> bit light for the size and weight of the boat). We rarely anchor in more >> than 20’ of water where we sail although we might rethink that if we decide >> to cruise up in Maine or Nova Scotia. >> >> Chuck Gilchrest >> S/V Half Magic >> 1983 Landfall 35 >> Padanaram, MA >> >> >> >> >> _______________________________________________ >> >> This list is supported by the generous donations of our members. If you like >> what we do, please help us pay for our costs by donating. All Contributions >> are greatly appreciated! >> >> >> >> _______________________________________________ >> >> This list is supported by the generous donations of our members. If you like >> what we do, please help us pay for our costs by donating. All Contributions >> are greatly appreciated! > > _______________________________________________ > > This list is supported by the generous donations of our members. If you like > what we do, please help us pay for our costs by donating. All Contributions > are greatly appreciated!
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