Stalpen Tree Jack

Here is a photo.

243892-StalpenTreeJack.jpg
 

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probably cheaper than the Silveys

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That's sort of what I was thinking. It wouldn't be quite the Silvey tree jack, but it looks handy. I think it would be worth having on the truck. But, I'd use wedges with this new jack. If that Stalpen isn't set right, I could see it slipping along the trunk wood and sinking into the ground. It needs a larger footprint on the ground or a special outrigger pad...
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I have used something VERY similar in sweden, a very good tool! but like all things has its limitations. The one i used had a bigger foot print and the spike part thats pushed into the tree was a lot wider.

Thanks matt
 
I've seen one similar. Major diff was the one i saw was beefier and the foot was chained to the stump to prevent kick out.

What I don't like with the one shown here is that there seems to just a tad too little MA with the crank. Also, with the crank you induce a rotational torque into the jack that can cause it to spin out.

Otherwise,great idea!
 
I think you would get much more mech advantage with wedges and a good deadblow sledge. Also easier to transport. This might be better for smaller diameter trees where wedges might be too long. It looked as though it took alot of muscle to crank it on the second tree.
 
I just use a wedge to keep the kerf open. The pull rope is the safe and powerful alternative. I know all the tricks with wedges but why not be totaly out of the danger zone?
 
How often are you totally out of the danger zone, really? The entire time that a person is in a tree, they are in the highest danger zone. Good skills, judgment, techniques keep you alive and healthy.


Wedges CAN be a very safe and efficient tool, IMO. In the USFS, an ax and wedges are considered PPE (or at least that is what I remember hearing when I had training through them, worked with some of the USFS people. They can help to keep you safe).

I'd be concerned about that jack slipping or stripping under too much load or a cave-in from a rodent hole. I'd use wedges to back up the jack.
 
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I think you would get much more mech advantage with wedges and a good deadblow sledge. Also easier to transport. This might be better for smaller diameter trees where wedges might be too long.

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Wedges shouldn't really be too long for the most part, if you cut one half of the back cut, insert wedge 1, then the other half of the backcut, and insert wedge 2. I've heard it called the quarter-cut technique.
 
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