Double Whipped Tackle (DWT)

[Rupe]

I humbley bow to your worldly knowedge. I have got some fun rigging over a caravan this week, and i shall give it a go. And when it goes belly up i will know who to blame:marchmellow::bowdown:

 

Also you only double the force on the anchor pulley if the two ropes are vertical. In my diagram above the overall load is shared between 2 pulleys so the loads not doubled on either. But your right, and thought must be applied to all rigging systems. In my diagram the tail of the lowering rope is attached to the same stem as the blue pulley, so the half load that that par tof rope is holding IS adding to the forces on that stem.

 

Sideways loadign on branches and stems is a major concern, far more then doubling the straight line pull on an anchor.

 

I'm not great at expaining the maths side of things but I can visualise it all very well (maths nerd me). If you think its not quite right then don't do it.

 

 

 

Can you not move the caravan?

[slack ma girdle]

Can you not move the caravan?

 

If only it was that easy. The ground has been so wet, the cost of re-instating the ground will be more than the day and half that it will take us to demolish the tree

[Rupe]

Cool, I get ya! One thing I missed is that even though you a halving the load by putting it on two lines, you are also potentially lifting a bigger load in the first place! Therefore the same care is required to not exceed rope strenghts and of course anchor point strengths, as you would in any rigging situation.