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Land Anchor's

:shock:Damn! You have clearly got a lot of time into that thing, and it shows! "thumbsup" Very nicely done. That is the nicest anchor I have seen built, without a doubt. Very nice craftsmanship.
 
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Wow, thanks ScaleReady. I'd been thinking about it for a little while. Made one that didn't fold as a trial. Then I did this one yesterday morning, took the day off for a visitation.
All I used was a hacksaw, a drill, my torch and my files.
 
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Here is one I was doing for awhile....
paintedpullpal.jpg

pullpalwithbag.jpg
 
Looks great bt isn't the shovel section facing the wrong way for it to work properly
195197d1335459206-e5.jpg

As in it should be horizontal in this pic not verticle.
 
Guessing what he meant and now that he mentioned it.... my thinking also...

If you use it the way you show, wouldn't it be the same as using a regular shovel? Once the original force is produced to get it in the ground, the design of the shape in that direction is made to have loosened the ground in that direction to ease the removal of the dirt in front of it.

If it were to be forced in to the ground in a reversed mounted position, the force applied to the back of the spade would spread and want to push the spade deeper in to the ground essentially deepening the anchor creating a stronger pull point with increased pressure.

Condensed version of what I meant.

The way you have it wants to ease the shovel out effect of the earth in front of the spade? Great for digging a hole, but reduces the "hold" effect.

A reversed mount of the spade would force it deeper in the earth the harder the pull?


I do think nearly all pull-pals have spades mounted the direction you have yours.... But would they work more effectively in the reverse mounted position?
 
Now I think the shovel design could easily vary for different soil types. I looked at a patent on-line and it did show the blade being opposite of mine. I think another factor is the angle in which the blade is in the ground for the different soil types/conditions and the angle of force on it.
I can and might just have to experiment with mine. I can change the head easily. I did think about making one for wedging in to rocks. But now I may have to for different soil conditions and types. Plus I'd kind of like to be able to adjust the angle of the blade which shouldn't be to hard with my anchor.
I could possibly get geeky with this. I actually run a soil mechanics laboratory.
We test strength, density, all kinds of mechanical properties of different soils and rocks. We break rock to see how strong it is, it's fun when it goes "BOOM."
But even moisture conditions could call for different set ups if you want to get real technical about it.
My soil here is very silty, farm land ya know. My first anchor had more angle to it and the blade just wanted to "plow" the earth. So I went with a broader head and more of a straight in the ground angle.
I'll try my blade mounted on backwards to see what happens too.
Thanks guys, I like it when we have to think a little.
 
What I noticed about the bottom pic above was that the "pull arm" and the "spade" if you look at the measurements, they are nearly square in there dimensions, with 580mm on the arm and the width of the spade and the length of the spade at 550mm.
 
I started making my anchor adjustable.
I do want to make different "flukes" for it to test out.
I also wanted to mention there is a Report on "Penetration behavior of an anchor in sand." Which has a bunch of interesting stuff. Now it's on sea anchors but I can see the theory's and formulas working the same. So I believe I'm right that the variables are so vast no one anchor could ever work for all conditions.

k11.jpg

Yeah, yeah the holes aren't parallel. I don't have a drill press, all my work is pretty primitively done. But it works.
P.S. I put a few more photo's of the anchor on my build thread.
 
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Actually, for a Land anchor to work effectively. You would need to make the spade so it digs in on an incline. when the main shaft is being pulled by a winch. It will force the shovel then to dig deeper. Not that your idea isn't bad and you shouldn't take offence to it for what you attempted, but this isnt a theory, its a fact. You don't pop tent poles in the ground straight in, you place them on an incline to allow force.

These are the Pull palls (Raptor land Anchor) I sell (Though currently out of stock) they are and have proved very effective.
IMG_2842.jpg


But as far as scale goes, I gotta love the Kuatto ones.
 
If your referring to my anchor I don't believe I have any thought of it going in the ground straight, I just wanted to make it so I have angle options. I have no real theory except different soil conditions need different designs to be optimal. For fun I talked to one of the Geotechnical Engineer's I work with here and he agreed that different flukes and angles would be needed for different soil conditions as well as factors pertaining to the forces acting on it. Some sort of angle is absolutely needed. But the degree of angle would also vary on different soil conditions and most likely the set up of your truck(mainly being weight). The first anchor I made was almost exactly like your's (Raptor land Anchor) but in this soft, moist, silty soil it just plowed the soil. Like a horse drawn plow would. My truck is pretty darn heavy too(about 12lbs. now). The broader head of my new one actually holds(it is angled to dig in, and it did dig in nicely). It just needed a bigger head to create a bigger shear zone for resistance so it will hold steady.
No offense taken at all, ever. I just want to learn and help other's learn if I can.
A spade would be much more suited for harder soils. We do have a scale issue here too. In Illinois the top soil is pretty soft but stiffens as depth increases. A real size anchor could easily get to that depth.
We also would have to consider the weight of our trucks.
Fact is there are soooooo many factors that would need to be looked at it's impossible to have a right or wrong theory or answer.
I think all these anchors are pretty awesome!!!!
Thanks for posting, post more anchors real or scale!!!!!
 
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team3six said:
Actually, for a Land anchor to work effectively. You would need to make the spade so it digs in on an incline. when the main shaft is being pulled by a winch. It will force the shovel then to dig deeper. Not that your idea isn't bad and you shouldn't take offence to it for what you attempted, but this isnt a theory, its a fact. You don't pop tent poles in the ground straight in, you place them on an incline to allow force.

These are the Pull palls (Raptor land Anchor) I sell (Though currently out of stock) they are and have proved very effective.
IMG_2842.jpg


But as far as scale goes, I gotta love the Kuatto ones.
Click to expand...

Thanks,haven't made any in awhile.Thinking about using thicker stock and tweeking the design a little.
 
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