Concaved or convexed?

A question was raised by one of our supporters.

I am very interested in the evolution of anchor designs. I have recently been drawn to the Viking anchor design.  There are not many reviews in the public domain, and none discussing the CONVEX assembly option as compared to the CONCAVE option. 

 

It occurs to me that the CONVEX configuration may have a different setting angle, due to the tip being further down from the shank. Also, there may be less packing of hard substrate in the center of the fluke, perhaps allowing the fluke to penetrate easier/deeper.  Furthermore, after pulling out of the seabed it might reset easier (again because of less mud packed on the fluke). 

  • This has been an issue with most of the other CONCAVE anchor designs on the market.

 

I would really appreciate it if you could share with me your thoughts on this interesting CONVEX option and also post your commentary on the Viking Anchors website.

Answer:

Dear Ashley,
Thank you for emailing us,
 
Indeed it is a very interesting issue.
 
When we have started working on our anchors back than we also investigated the convex/concave dilemma, at that time it was clear that concaved anchors are accumulating mud on their crown (the point where the fluke and the shank are connected), and by doing that changing the balance of the anchor, a thing that significantly affected the resetting process of the anchor in case needed.
 
As a result, we have decided to let the customer choose how to assemble his anchor, concaved or convexed, it was clear that in muddy seabed convexed shape is better by preventing mud to pile up on the fluke but we also learned that the concaved shape holds a little better.
 
Another thing we have learned was that by making holes in the fluke we have reduced the vacuum effect that was actually the main reason for the mud to stick to the fluke.
 
The angle of the fluke to shackle hole is vital and it took us a lot of time and effort to get to the right angle, too narrow means fast setting and low holding power, and too wide, up to 30-40 degrees meant great, maximum holding but hard to set in hard or weedy seabeds.
 
The angle of fluke to shackle hole stays the same, concave or convexed.
 
When we have found that the holes in the fluke prevent the mud to pile up we have decided not to recommend using the anchor in a convexed shape, simply because there was no need anymore and, as said above, in most seabeds concaved anchor will hold better.
 
Nowadays it is not even mechanically possible, since we made some changes to our tip connection (see attached) that prevent assembling the fluke upside down.
You can also see it in our 3D view here:https://vikinganchors.com/products/anchors/viking-anchor
 
It is nice to see that some people do understand the importance of this piece of metal called anchor, from our experience many don't care.
 
I hope you got the answer to your question.
 
As usual, these days, take care and stay safe.