Rigging problem

[Monkey with a chainsaw]

Learning about rigging now and i made this modular model where you can change angle and number or limbs on the branch .
How would you rigg this really unbelanced example in one go ?
(Would be a branch with a lot of foliage ... the brick ... only at the tip)
Assumed that you can't move the top block any higher.
The problem is that i can't make it not to swing back to where i would be cutting , since the the centre of gravity is too far off the tip.
Here is the video.

https://drive.google.com/file/d/1B5sfCXiiVtBbmAK1Ao75-_V0h9WtoDX_/view?usp=drivesdk

Is a Google drive video sorry i couldn't upload a video from my phone.

 

[Z'sTrees]

Could you set a tag line at where your tip tie is in place, make a sideways snap cut with a face (or just a regular side-face and back cut), move up or behind the trunk and have a ground guy pull it around.
That or if there's any room to let it run just below you.

 

[Jehinten]

I agree with the above, using the tag line to trigger the movement. If there's room to let it swing down then just keep the one tie by the butt of the limb. It will swing down and away from the cut instead of back towards it.

 

[Jehinten]

Btw, that's a cool model for learning how weights and ties will affect the swing. Most people just try to learn the forces on the go, while in the air. One thing you could possibly add to it is a vice/clamp to attach an actual limb to the model, then use a hand saw to make your cuts in the wood itself for a more realistic apprach. Your current setup does not allow for hinge wood.

 

[Monkey with a chainsaw]

Side hinge cut then and swing the tag line on the side to trigger the back snap... you guys are smart !!

 

[southsoundtree]

Your butt-tie can be moved all the way to the cut, near the trunk.

You can anchor a line to the piece and to a ground anchor opposite to the trunk in addition to your spider leg set-up. This will become a tag-line.

 

[adaycj]

Nice model. I agree with keeping the butt tie, and only use another line to control it after the cut if needed.

I posted in another thread about this, but horizontal branches it is very hard to predict what will happen when the tip line takes the load. Your video illustrates this perfectly.

Another option would be to butt tie the branch on the spar (trunk/dominate) below the branch quite close to the branch, leaving your other rigging. The short hunk of rigging at the trunk controls the branch after the cut. Then the other rigging can be used to control the weight while the trunk is released. Depending on the weight and expected movement a releasable hitch (like highwayman's) could be used. The complications are managing the release of the additional tie, and more rigging near your cutting.

A few years back I used a rigging setup like yours to cut branches directly above a greenhouse. I never had the guts to try the releasable knots, so I just fussed with zip line slings as the crew lifted the weight. It was easy to feel and see what way things were going with the sling after the cut, but it was extra time and fooling around I maybe could have avoided. I was getting paid for the time, and using two separate anchors, one with a very short leash paid off for me.

 

[Jehinten]

Nice model. I agree with keeping the butt tie, and only use another line to control it after the cut if needed.

I posted in another thread about this, but horizontal branches it is very hard to predict what will happen when the tip line takes the load. Your video illustrates this perfectly.

Another option would be to butt tie the branch on the spar (trunk/dominate) below the branch quite close to the branch, leaving your other rigging. The short hunk of rigging at the trunk controls the branch after the cut. Then the other rigging can be used to control the weight while the trunk is released. Depending on the weight and expected movement a releasable hitch (like highwayman's) could be used. The complications are managing the release of the additional tie, and more rigging near your cutting.

A few years back I used a rigging setup like yours to cut branches directly above a greenhouse. I never had the guts to try the releasable knots, so I just fussed with zip line slings as the crew lifted the weight. It was easy to feel and see what way things were going with the sling after the cut, but it was extra time and fooling around I maybe could have avoided. I was getting paid for the time, and using two separate anchors, one with a very short leash paid off for me.

On your example in the last paragraph with the butt tie and not wanting a releasable hitch, you can also use wraps around the trunk. This way you can release the wraps to untie it, instead of the ground guys having to lift the piece. In my experience any piece that you are going to use spider legs on will be too heavy to lift without adding mechanical advantage, if the piece is lighter it is easier to tip tie and lift the piece up to the rigging point.

 

[Monkey with a chainsaw]

Your butt-tie can be moved all the way to the cut, near the trunk.

You can anchor a line to the piece and to a ground anchor opposite to the trunk in addition to your spider leg set-up. This will become a tag-line.

mhh , but in a situation like this would be something underneeth the branch ( that justify such rigging) and most likley nothing to anchor the tag line on that side .
That's why I was happy with the side pull ... most likley the side would be free from structures.

 

[TheTreeSpyder]

If clearance for such a sweep; controlled folding down or over by strong tag line pull (to force a stronger hinge) would seem best as offered.
.
If still trying to spirit limb off/down horizontally would consider more angle in line near hinge to pull more away from climber.
.
If center hitch point was separate shorter line to plate;
some slackness in tip hitch; for tip to sit some, but not run-away /stay upright
would change tensions; modify strategy to where 'wing' supports stabilized; center carries most of loading
Or, double center hitch support so is less elastic to loading than other 'wing' supports for similar effect.
.
Another way on some tough ones is to change the problem by altering the balance;
by hanging 300-400# of another limb towards hinge as ballast;
to pull the CoG forcePoint that direction/ away from tip.
Might even essentially reposition the branch offered closest to hinge, to even closer to hinge for more ballast from it.
.

 

[treebing]

grcs

 

[treebing]

maybe, my standard practice is to knock unpredictable brush off with my handsaw real quick. it only takes a minute and it makes rigging decisions completely mathematical. I have misguessed brush weight so much that I hate even bothering with that anymore. get rid of it and thus all the guessing. the math is too complicated. eliminate it and you can then use a measuring tape to know down to the pound what will occur. brush always required guess work. That said, using a tag line and a good hinge to pull it down and to the side sounds like the solution.

 

[treebing]

its a few small cuts cuts usually to knock that brick off the end, and your already out there to tie that rope.

 

[Stephen Moore]

the tip tie on the end is not required and pulls the branch towards the cutter. The vertical middle branch would accomplish the same goal and allow you to reposition for better balance or to swing away.