When I am asked
"Would YOU leave YOUR boat sitting unattended for a few days ?"
I do not assume the real question is "Should I leave MY boat ....."
And when I write
"If I had to leave MY boat ... here's what I would do"
I do not intend other people to assume I am really saying
"If YOU have to leave YOUR boat ... here's what I think YOU should do"
I don't see this to be a strict Q&A forum. I consider it a discussion forum.
I'm overstating the case in my opening gambit above, because actually I agree with you that the OP was hoping for specific guidance, but I personally would not be happy trying to give it, without spending half a day with the guy and asking HEAPS of questions. The stakes are too high, and the info given was negligible.
60 posts into what had become a more wide-ranging discussion about leaving boats unattended, I think it was unrealistic on your part to expect every post to be tightly focussed on giving the OP specific guidance, and despite my careful wording, it seems you have misunderstood my intent in posting
And it seems to me you were going out on a limb when you stated that, after a week unattended on a single anchor
"His boat will be there when he returns". That doesn't suggest to me that he would need to hover nearby throughout the interim period.
However your subsequent comments in red make it clear that is what he would need, in your opinion, to do.
- - -
I'm not sure why, but you also seem not to have noticed three separate occasions where I have made it clear that I don't favour using all chain for the third anchor
. My first post on the topic was not a detailed recipe but a brief overview of the geometrical concept
. I do however apologise for my lapse; I normally err on the side of dotting too many I's and crossing too many T's.
- - -
So .... I'm wondering whether to put the time into answering your detailed questions. If I were to be ungracious, I would hide behind their irrelevance to the OP's needs, but in reality, I'm not confident of your careful consideration of my answers. It doesn't help that it seems to me that some of your questions have been answered in previous posts.
But I'll compromise by briefly touching on some answers. Hopefully someone reading this might find something which would at least leave them pondering some new lines of enquiry. I'm tailoring this answer to boats carrying a bare minimum of chain: One all-chain rode
, and one shorter chain, mixed rode.
Setting two anchors at 120 degrees can be done on the main chain:
First set up waypoints for the three anchors, and one for the Centroid. The distance from the centroid to waypoint 1 should be short enough, in relation to the length of the main chain, that you can get the swivel to the surface to attach the third anchor warp, bearing in mind that when you drop it, it should be near the centroid
Drop #1 at waypoint 1, set it with the chain lying over waypoint C.
Steam to waypoint 2, drop #2 on the other end of the main chain.
Hopefully you will have thought to rig some sort of saddle around the chain before dropping it, with a line from the yacht to the saddle. If you have a suitable (ie proper) saddle, it also gets around the problem of attaching the swivel to the midpoint of the main chain.
I attach a picture showing roughly what I mean by a saddle, although the purpose (and scale) of the item shown is somewhat different.
After steaming to a line bisecting anchors 1 & 2, the saddle should be hauled up tightish and immobilised to the chain in order to set anchor 2 (using a line to get the necessary scope
, and pulling towards or through waypoint C), and also because otherwise anchors 1 & 2 will not see the load always from the same direction.
I can think of about nine ways of doing this, but it will depend what sort of substitute saddle you can improvise. A large bow shackle will serve the purpose at a pinch, provided the 'immobilising' is done in such a way as to present a fair load to the two halves of the main chain.
Now the third anchor can be laid on a mixed rode, from a dinghy
. If you don't have a portable (or any!) GPS
, the yacht can be idled in reverse to hold station over point C, so the dinghy
can estimate where waypoint 3 would be.
If the chain is long enough, it CAN be hauled up to the junction at the saddle, running the rope
rode through the saddle or a snatchblock clipped to it, so you CAN have an all-chain mooring
, but not from a dinghy! (Unless it's a pontoon workboat or somesuch)
I've done this in a shallow anchorage but it would be a mission in a deep one, and diving gear
would (I think) make it a lot easier to get a compact setup.