Aftmast rigs???

Rigging Force Analysis...discussion?

I guess this 'anchoring discussion/accident' is easier to debase than the rigging force analysis I offered back in posting #345...almost no replies
..

Rigging Force Review

 

Overwhelmed

I would have but all the numbers made me sleepy.... Rode out a 60+ mph storm at the dock November 21. That was a hoot. I'll go back and look at your analysis but you can't expect me to comment on what I don't understand, unlike some people....

 

You guys are getting hammered out there this year. Pus its probably rather 'cool' wind I don't envy you at all, nor anyone on the west coast of the USA this winter.

 

Re. the dragging ashore incidents: downunder got it right in post #435. If a boat drags anchor and ends up on shore (either on the beach for a cat, or on its side in the surf for a mono), the anchor was either too small or poorly set. Mono vs. multi has very little to do with it, as appropriate anchor selection methods for both types have been very well known for a long time. If you fit a boat with too small an anchor, then set it poorly on too little scope, it's not the weather's fault when the boat ends up on the beach.

(By the way, those "appropriate" anchor selection methods? There are more scientific ways of doing it, but this one's my favourite. Look at the manufacturer's recommendation tables, that's the absolute minimum in fair weather. Now ask "what's the biggest !@#$ anchor this boat can manage without causing problems", and that or a size down is about right. If this method conflicts with the manufacturer's tables, the boat has a design problem.)

Re. the aft mast rigs: I don't have much to offer at this exact moment, but I'm enjoying the discussion and the interesting ideas!

 

No, he didn't.

Or, as seem to be the fact in this case, most of the boats that were grounded were anchored just fine. Then one boat came loose and tangled/cut other anchor lines. I would guess some of the boats that were freed then caused damage to other boats that were also anchored securely.

Some info about this was posted just 2 posts ahead of #435.

 

Paul: In all the articles linked in the last page or so, I saw only one explicit reference to an out-of-control boat probably cutting one other boat's rode (that of Miss Saigon). There was no one clump of beached boats; they're spread out over hundreds of metres.
I did, however, notice that in earlier photos from the race, most yachts had stowed their large anchors and were carrying far-too-small anchors, if any, on the bow. (Large anchors may have come out later, but I suspect many did not do so.) These are racers, weight is critical to them, and skimping on ground tackle is not exactly uncommon.

 

Yes, many of the boats did stow their large anchors. They stowed them on the bottom of the harbour, with a float to be picked up after the day's racing.

You would not see an anchor on the bow of any serious race boat.

 

What happens with many Multihull dragging disasters has nothing to do with windage, anchor size or skill in anchoring. Many Many times, because of their beam Multis can't fit into a harbour...no space, so they have no choice but to anchor off. At present, in front of this harbour, are 4 multis anchored, no monohulls, and exposed to violent weather. Its blowing force 8 right now. Under normal conditions NO SEAMAN, regardless of how big their anchor is , would ever knowingly anchor in this exposed bay. I can see waves sweeping their decks !!!

Another Bad habit I observe amoung the multis is that because of their shallow draft they can anchor very close to shore and they do. Obvoiusly, even when watch is being kept, if their anchor drags they have no time to escape before the bottom grabs them.

Any serious Multi sailor would be wise to carry the largest anchor and chain possible , perfect the various anchoring techniques and avoid the temptation to anchor close in to take advantage of their limited depth.

The incident in Thailand looks to me like a classic case of poor seamanship. Exposed anchorage, no watchkeeper on duty.

 

They anchored too close to go-go bars

 

The incident in Thailand was a classic case of poor seamanship. Exposed anchorage, or no watchkeeper on duty.

Michael, I would however take issue with you that this is a multihull issue as its a general boating issue. More boats are damaged from poor anchoring than any other reason. As there are more monos in the water there will be more monos in the statistics.

"Any serious Multi sailor would be wise to carry the largest anchor and chain possible , perfect the various anchoring techniques and avoid the temptation to anchor close in to take advantage of their limited depth".

It's a sailor issue. If you have read Dashew's books (as good a reference for sailing as has been writen) your comment comes straight out of his recommendation for any vessel.

cheers.

 

BIG LAUGH . I liked that one

 

Would be correct there.

 

EXACTLY. How many racers do you know that carry around their heavest ground tackle during a race...no you put it in a shed and take along your lunch hook.

Besides I believe this King's Cup race is not know for heavy weather at all... I believe it has an element of 'party circuit' with some day races from resort to resort thrown in. I think they described this incident as quite unusual, so likely a number of the seasoned participants took their anchoring rather lightly.

 

Ive never quite understood how a Multi anchors ? I assume the ground tackle is set from the centerline . How do they store 150 meters of chain ? How do they set two anchors when exposed to tidal current ? How do they use a breast anchor ?

Can someone post the drawing of a typical cruising Multis stem head roller, anchor chain locker .

 

On powercats and motorsailers, we usually run the chain aside into one hull, through plastic pipe. On high-performance sailing cat - yes, it could be a challenge as there is not enough chain drop.