Neeves
Well-Known Member
There is difference in measuring holding capacity, depend on how you do it, and using an anchor in real life. When measuring holding capacity you try to give the anchor as good a chance as possible and commonly select a clean seabed devoid of rocks, grass and weed. If you are manufacturer you also try to select a seabed in which your anchor will perform well. Real life is slightly different.
It merits note - at the time the emphasis was on hold, nothing else seemed to matter - all the manufacturers were touting the idea their anchor had more hold than the others. Historically hold had been the criteria to measure performance - so the idea of selecting a seabed where hold could actually be measured - made a lot of sense (even if it skewed, or not, the overall conclusions). The other factor is hold can be quantified other anchor characteristics are often subjective - and often a basis for argument
Good anchor testing should also test the ability of the anchor to engage (and then set) in other seabeds.
Anchor testing is incredibly expensive and arduous - often corners are cut and key tests, like setting in mud (as well as sand).
No test is perfect - its better to look at a range of tests - preferably under water (in fact any not under water I would exclude). But don't discourage people testing - we slowly develop a number of data points which combined are useful.
The best tests, there may be others, are those from SAIL/West Marine and two from Voile et Voileurs (( think all published in YM and other magazines). Unfortunately they are now slightly dated and we have had a couple of anchors introduced since then - some of which have never been tested at all (even by the manufacturer) - so much for the importance of holding capacity.
What is interesting - despite our interest in the past of holding capacity - these untested anchors enjoy sales. I wonder what changed the customers perceptions?
I started a thread some, longish, time ago asking about dragging of modern anchors - and there was little evidence of failure (but this might reflect a high degree of customer loyalty - as I think modern anchors do drag). However we might have sufficient holding capacity - (at the recommended size by the manufacturer for our yachts) and maybe the focus might move to ability to engage the seabed quickly and resist the forces developed during yawing and hobby horsing.
http://www.ybw.com/forums/showthread.php?502469-Dragging-of-anchors&highlight=Dragging+of+anchors
Jonathan
It merits note - at the time the emphasis was on hold, nothing else seemed to matter - all the manufacturers were touting the idea their anchor had more hold than the others. Historically hold had been the criteria to measure performance - so the idea of selecting a seabed where hold could actually be measured - made a lot of sense (even if it skewed, or not, the overall conclusions). The other factor is hold can be quantified other anchor characteristics are often subjective - and often a basis for argument
Good anchor testing should also test the ability of the anchor to engage (and then set) in other seabeds.
Anchor testing is incredibly expensive and arduous - often corners are cut and key tests, like setting in mud (as well as sand).
No test is perfect - its better to look at a range of tests - preferably under water (in fact any not under water I would exclude). But don't discourage people testing - we slowly develop a number of data points which combined are useful.
The best tests, there may be others, are those from SAIL/West Marine and two from Voile et Voileurs (( think all published in YM and other magazines). Unfortunately they are now slightly dated and we have had a couple of anchors introduced since then - some of which have never been tested at all (even by the manufacturer) - so much for the importance of holding capacity.
What is interesting - despite our interest in the past of holding capacity - these untested anchors enjoy sales. I wonder what changed the customers perceptions?
I started a thread some, longish, time ago asking about dragging of modern anchors - and there was little evidence of failure (but this might reflect a high degree of customer loyalty - as I think modern anchors do drag). However we might have sufficient holding capacity - (at the recommended size by the manufacturer for our yachts) and maybe the focus might move to ability to engage the seabed quickly and resist the forces developed during yawing and hobby horsing.
http://www.ybw.com/forums/showthread.php?502469-Dragging-of-anchors&highlight=Dragging+of+anchors
Jonathan
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