Anchor Testing

rev. 3-17-2026

 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 M1 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, medium, and low shanks (Delta vs. Bugel vs. Oden).
• Multiple roll bar and wing options. 
• 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. Down-turned toes.
• Split toe flukes (like Fortress and Knox).
• Sand and typical Chesapeake layered mud.

 

A whole fleet, with more than 100 possible combinations. 3-17-2026

 

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. In 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 and detritus from run-off lay down a compost layer 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! 

 

 

 

 

If the step is too far (icy decks become a problem this time of year and my knees are getting older) add a railing. A pull-in line also helps.

The railing is welded from 1 1/4-inch square tube. It is attached with lag bolts, and the top is reinforced with a 1 1/2-inch steel strap around the piling. The paint has a non-skid finish. About 2 hours of cutting and welding, followed by painting and installation. 

 

Why You Don't Inject Epoxy into a Wet Deck to Effect a Fake Fix

 I tried to explain this over and over, but the editors always wanted articles on short cuts to fixing a wet deck. Well, injecting epoxy into mush is not a way to fix anything. It's not going to bond, doing a proper repair is more difficult, and now you have all of these holes.

 

Looked at another way, this is why smearing the surface to be bonded with mud and then working in the rain is not a good way to work with epoxy. It's not OCD to get things clean and dry, it's just ... obvious.

Telltail Locations

 Add enough and your sails will look like something from a wind tunnel lab. Yes, you can do well through experience and looking at the shape of the cloth, but they do remove some of the guesswork from sail trim. I've been doing this for over 40 years and I still appreciate a full set.

 The main leach tell tales can suck around behind the sail intermittently at the top when trimmed for peak power. The jib telltails should never suck back. Jib stall is worse than main stall since it will reduce the flow over the main.

 The  

 

 

 

 

 

 

Tying Up a Wide Boat

 Tying up a wide boat can be complicated. I can only reach one piling from the dock.  The slip does not fit the boat.Currently, I use the black lines in the illustration, but as my legs get old I wish I could tie it nearer to the dock (a big step). But I must tie it well off to allow for tides.

I'm considering putting a pulley or low friction ring on the port bow line piling and lead the tail back to a cleat on the dock so I can adjust it from there. But I worry about chafe. The strong winds and wakes come from aft, so I can probably just keep an eye on it.

Gulls and Halyards

 Some attest they love the sound of gulls. It reminds them where they are. I think they havn't been around the water long enough to get sick of the screaming vandals. All the noise tells me is that I'm in a messy harbor. The Little Mermaid had it right.

"Mine, mine, mine, mine, mine, mine, mine ...."

As for halyards, I have no problem with stepping on an unoccupied boat and tying them off. They left a nuisance behind, so they have no reasonable expectation that someone board to fix it. When they see it tied off they might learn from that. 

[Once 40 years ago someone tied mine off. When I came back I saw the string and I was immediately chastened. It never happened again, not because I'm a great guy, but because it was an embarrassing lesson I didn't want to repeat.] 

 

Line Hangers

Whether halyard tails or docklines, sailors always have ropes to hang. A few ideas. Bags are good to, when there is room (the lines will grow more algae in a bag).

 Button Line Holders from United Yacht Manufacturing are my favorites for halyard tails. Easy to adjust or replace the string. Nothing snags on them. Comfortable to lean against.

 

 

For dock lines and other spares, I like these DIY aluminum non-snagging holders installed in a locker. I can hang multiple lines on one hook by slinging the coils. I've used them on several boats without a failure. Strong and light.

 

 

 

 

 Need a more heavy duty bender? Shif the spacing in the vice to adjust the radius. A bolt between them can help (home made).

 

 

Or really heavy duty. This is good up to 1/2-inch rebar and is what I used to make some of the yard art.  Home made, but you can buy them (mostly lighter duty). Very handy.

 

 

 

Non-Sailing Projects

 I'm kind of out of boat projects, so I've been welding up stuff. With the exception of some of the rebar, everything is recycled from scrap.

 

 One of my first efforts. Simple.

A representation of my F-24, sailing the lawn. The sail trim is sharp but it doesn't float well. Too many leaks.

Glasswing Butterfly mobile. The lilly pads (helium cylinder ends) under it will get bright metal flowers soon. Repurposed anchor chain, of course.
 

The planter was welded from old bedframes.

The head is an old worn-out weld chipping hammer head.

Steady rest, also mostly bed frame steel. Very stiff.

Rolling kayak rack. This makes loading it onto the car much easier, and rolling it away easier and neater. Bed frame, straps from old PFDs, and casters from Amazon.

If you have a portable metal band saw you NEED to make a stand/base for it. I use it 20 times as much now. Many examples on-line, and you can buy them for newer saws. I had to make this one, because the saw is older. Even a little table makes cutting parts and backing plates so easy and far more accurate.

The saw just lifts out of the base. A few screws take the table off, leaving the stock rest in place for hand-held use. But I've never taken it off the stand.

 For cutting long material, I have several adjustable stands, similar to those used to support long work on a able saw.  One was made from bed frames. The other is a photo light stand for which I fabricated multiple heads, either for support or for work lights.

 

I had this piece of glass, so I made this end table for our front porch. Bed frame.

 

More stuff that I have given away. More to come. Once you get the hang of it, welding open many fun possibilities. I have quite a few bits of tooling for my lathes (wood and metal) that involved both machining and welding--machining is subtractive and welding is additive--combining them results in great flexibility in fabrication.  

 

 

 

Tramp Lacing Knobs

 After 30 years the original knobs are breaking down. A few days ago a line tried to jump off. Time for replacement. The tramps are good and the line OK (replace in a 1-2 years?), but the knobs are toast.

 

 

The knob in the foreground is missing chunks. Behind is a portion of the 46 replacements I turned. 

 

I could have bought them, but I had something a little different in mind. The replacements are twice as strong and should outlast the boat. The screw is recessed.  There is non-skid on the top.

 

So I turned them from 1/2-inch HDPE on my metal lathe. The first few took an hour, figuring out the measurements, materials, and machining a mandrel. But after that I was down to about 3 minutes each. Not a bad way to spend a few hours.

 

 

 

 

Blanks were cut from 1/2-inch HDPE sheet using a hole saw with a 3/16-inch center bit fitted (1/4-inch is standard). They were then turned on a mandrel, and the hole countersunk on the drill press. Assembly line.

 

 Installing them was another matter. Most of the screws were seized and grabbing round heads with Vice Grips is a pain. But the end result was pretty.

 

 

 

Snubber Design

 How can we get more stretch from a bridle?

 More length. Yes, but there will also be losses from friction. In the left center (below) illustration the stretch would be 5 feet in 50 feet, given the assumptions about line size and stretch, but it is only 4.5 feet because some force is subtracted by friction over the bow.

Double around a low friction ring (left illustration). The problem here is that we lose a lot of tension going around the ring. They are only 70-75% efficient in a 90 degree bend (testing). Stretch goes down to 3 feet and a new chafe point is introduced. What if we use a thinner line (center right illustration) to increase stretch? The safety factor stays the same and stretch goes up to 3.4 feet.  The only way the doubly method comes even close is by using pulleys, and it is still less efficient.

What about energy absorbed by friction? Yes, that is valid, but work is still force through a distance and the damping distance is still reduced. The same effect would be had by using one size larger rope, and without the chafe risk.

 In fact, there is fourth case, (left), where the stretch increases to 8.4 feet, using a 0.5:1 purchase. In stead of rigging the bow as a 2:1 purchase, a line runs forward, but on the side deck a reverse purchase is rigged, so that the forward line moves twice as far as the side line stretches. Complicated, though.