Anchor Testing

 But different this time.

 Since I have become a competent welder, I've decided to break anchor performance down, one component at a time. Yes, they are interrelated, but it's where you start. The idea was spawned by having a number of Mantus Dinghy anchors left over from testing. They are modular, coming apart quickly for storage under the seat of your jet ski. But even larger anchors, of many brands, have transitioned to bolt-together constructions to reduce shipping costs.  

I've started testing:

• Multiple sizes, from 4" to 9" fluke length.
• High and low shanks (Delta vs. Bugel).
• Multiple fluke shapes, including curves side-to-side and front-to-back. 
• Multiple fluke angles.
• Multiple crown (the joint between the shank and fluke) positions. 
• Shaping (streamlining) of edges on flukes and shanks.
• Fluke point angles.
• Split toe flukes (like Fortress and Knox).
• Sand and typical Chesapeake layered mud.

 What have I learned so far? A few things. 

• The most important variable, by far, is the fluke angle. A few degrees steeper, and it doesn't set at all in firm bottoms. A few degrees less, and it sets easily but doesn't hold as much.  The usable range is probably as narrow as 24-32 degrees.
• Shank shape and height, attachment method, crown position, and fluke shape, within a surprisingly wide range, make very little difference, as long as the fluke angle is correct. Some room for optimization. Balance can matter with a roll bar, and is vital without.
•  Chesapeake mud is more complicated than I thought. Open areas, exposed to tides, the loose stuff is washed away and the bottom is more uniform (unless it is slate washed free of all sediment). However, in the creeks, leaves lay down compost every fall, resulting in a mushy even semi-liquid layer that is too light to consolidate. Then comes the underlying clay, which is covered with oyster shells from centuries ago back when the Chesapeake was perhaps the most productive oyster grounds in the world. The challenge is super soft mud, which won't hold beans, over a layer that can be hard to penetrate without the right anchor and technique. Traditional answers have been either a really, really big anchor, or to let the anchor "soak" for 20 minutes,  sinking down through the soft stuff, followed by careful setting into the underlayer, which may or may not work, depending on the anchor type and setting method details (it's not just drop and back down).

Time to make some more models!