Re: Ground Tackle for an O'day 35
As I have looked at this, my initial thought was as noted, that the extra 10' of 1/2" chain would act as a kellet if I'm (we all are) using that term correctly vs just the 5/16 chain.
With this in mind, what would be cool is if there was a online program or equal, that one could put into it different anchor rode options. Then one can compare them in some way. Lets use when the rode is off the ground due an x knot constant wind. Our options in this case.....
A. is the original mention. 33lb rocna, 25' of 5/16 chain then 10' of 1/2" chain.
B would be Craigs method. ie rocna/1/2" chain then the 5/16
C would my my mention to a degree. rocna, 5/16" chain then a 20 or so lb kellet.
All would have lets say 235' of rode/chain from the end of the anchor to the anchor pulpit. Such that all have say 7-1 scope. So option A and B would have 200' of say 5/8 3 strand, option C due to less chain would have 210' of line.
In my mind, if all three were left to just the anchor at say 38-40 knots, ie the rode is pulling straight to the anchor, no slack or droop, I would call that even. If one is at 35, the others at 40 and 45. Then in my eye, there is some difference in how the three are helping keep the anchor at a level pull!
Then for that matter, lets look at just say since we are pulling up about 70 lbs of iron with any of these three setups. Lets look at how well a 70 anchor would do with ALL line, vs say a 50 lb anchor, with 20'lbs of 5/16 or 1/2" chain, Obviously I hope, the chain length would vary between the two chain sizes to get the 20 lbs of chain wt, then the rest in line, again totaling say 235' at a scope of 7-1.
My feeling is, if someone could come up with a program that could figure out the how much holding power a given option gives us. I suppose unfortunately, some of these various and sundry disCUSSions on anchors would/might go away on forums such as this.
I did see in the links Med posted, that ALL chain does have the same final pull once fully extended as a combo rope/chain does. But the spike/peak punch of you will is much smaller in time than the line/chain. The all chain in my mind, would probably be worst on the boat etc, than the longer more fluid soft to fully loaded to soft again with the stretch of the line. TO me this would be like getting hit over and over with a hammer, ie all chain, vs being connected to a bungy per say, and the hit comes on at a slower pace. TO me, the latter would be less intrusive or hard on the boat and systems.
This solidified that for the type of anchoring, depth etc I am in, that a line/chain rode is preferred over all chain. Now comes the which and how much chain might be the best help for my anchor on my boat! Along with dealing with the issue with the 2 armed windlass!
For my lunch/race hook, I need per the rules, a total of 12lbs of setup, this includes the anchor, chain and rope. I have about 12lbs of metal, and 2-3 lbs of rope. 9lb fastset, 6' of 3/8 bbb chain and 200' fo 7/16" 3 strand. On the other hand, for the overnight setup if you will, she came with a 7.5kg TRUE bruce, ~16' of what appears to be 1/4ht chain and 250' of 9/16 or 5/8 3 strand. I was toying with bumping the chain up to 30' of 5/16HT to hopefully keep the line pull level in higher winds. Now to figure out if that truly works or not! Hence why a program somewhere to input setup, and hit enter, and get a what or how it would work etc.
My 02 on the subject, not that it is worth anything these days! I would like to know if Craig or one of the other anchor purveyors is willing to put in there 02 as to which chain/rode option would be better, best per say. The fortress rep in the past, has preferred 3' of appropriate sized chain after the anchor then the rest rode! This allows as I mentioned above, I believe option D or E, BIG anchor little chain, in this case, more surface area to literally hold you in a windy condition. Hence where aluminum if it can set, can be lighter, potentially better on the 2 armed windlass than an iron equal anchor!
She drives me boat,
I drives me dinghy!