Pulling Power

[wildewood]

Any one here good at maths and equations?

 

Pen and paper at the ready.

 

Sweet chestnut, 10 metres length, with the total weight of the stripped stem weighing 2.5 T on a slope of 40 degrees.

 

The hung up tree leans down the slope at 50 degrees.

 

The wire to pull the top of tree back up the slope, i.e. towards the top of the hill, will have an angle of 30 degrees.

 

All angles are from a horizontal plane.

 

Anchor point 25 metres from wire attachment point on hung up tree.

 

There will be no resistance from root plate, but some from hinge.

 

So, how much force (pull) will be needed to lift tree to an upright position?

[hazzygawa]

45000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 and 1 N.

 

thankyou, where do i pick my prize up from?

[Dean Lofthouse]

At a wild guess I would say something leaning out at 45 degrees would have 50% of it's weight on the pivot point (root) and 50% on whatever is holding it up.

 

Therefore if you use a 2 ton winch you are allowing for any resistance or error.

 

All I would do is put in a 5 to one fiddle block one way system to hold the trunk in place should the winch fail

[rk23]

Can we assume the trunk to be a right circular cylinder?

[chris corfe]

2 tone winch yep

[Stephen Blair]

just get the biggest winch you can get your hands on and the biggest strops as well. can you be 100% sure of the weights and angles, where is the root plate going to go once you have pulled it over(i presume its windblown)

[wildewood]

SWB..

Root plate stays in situ; gob cut on the stem. Measured the stem, guessed the angles.

[wildewood]

45000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 and 1 N.

 

thankyou, where do i pick my prize up from?

 

No prize; your'e one o out.

[wildewood]

At a wild guess I would say something leaning out at 45 degrees would have 50% of it's weight on the pivot point (root) and 50% on whatever is holding it up.

 

Therefore if you use a 2 ton winch you are allowing for any resistance or error.

 

All I would do is put in a 5 to one fiddle block one way system to hold the trunk in place should the winch fail

 

Thanks Dean, that wild guess sounds good to me. Using a 3.5 T winch system, plenty of margin...

[wildewood]

Can we assume the trunk to be a right circular cylinder?

rk23

Stem round, like a lot of trees...