This article is the opening post of a thread in SailNet.com which generated 8 pages of responses, some refering to the physics on the holding power and some anticdotal perhaps even more impressive with real life experiences refering to the screw anchor system

The link to the entire thread is:

http://www.sailnet.com/forums/general-discussion-sailing-related/43174-installed-helix-mooring-anchor-last-weekend.html




Joel73
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Installed a helix mooring anchor last weekend...

Just thought i'd share our installation experience with the helix mooring anchor. Originally i was going to install two of these anchors but i decided that one would be sufficiant and i could always add the second one later if i felt the need. Unfortunately we didn't take the camera out on the skiff with us so all i have are prep pictures... but you will get the idea.

There were three of us (My dad, my neighbor and myself) but it could have easily been done by two. As you can see in the pictures we used a 10' joint of 4" PVC schedule 40 pipe to extend the turning position above the water. It worked like a charm; we used an old bumper jack/lug wrench handle to turn the pipe and it was fairly easy to turn and was rigid with no flex in the pipe and relatively light weight. We marked the PVC pipe at one foot increments starting at the anchor eye so we would know how deep the anchor was. We even attached the 1/2" chain to the anchor eye and had it fed through the pipe while we turned it down into the mud. The only dive needed was to take the bolt out that had the eye pinned to the PVC pipe so we could slip it off... easier said than done but not that bad. Visibility in the murky water was about a foot or so. I managed to avoid the jellyfish and bluecrabs while on the bottom taking the bolt out of the anchor eye. We decided to sink the anchor 1-2' deeper than the creek bed for a total depth of 8' which meant digging down to take the bolt out of the eye. All installation work was done from our neighbors 12' Carolina Skiff which was anchored three ways to keep it in place. The water was seven ft deep when we placed this one.

These are the anchors...


Photobucket

Here are the prep pictures...

Dad, Bella dog and I...


Heavy with the 1/2" chain attached... but not too bad. You can see the holes drilled at 1' increments for putting the tire tool in place turn turn with.


Closer view...




Different angle...


Here is a better picture that shows the holes for turning... as the anchor sank deeper we would simply pull the tire tool out and move it up to the next hole and continue turning... much like a giant cork screw. The rod in the picture was what we originally planned to use but it ended up being too long to manage so that's when the tire tool came into play.


I wish i had the actual install pics but i think you get the idea.