Technical Rigging


Excessive shock loading must always be considered when rigging. The rigging system should be constructed to withstand the maximum shock-load potential. Generally, maximum shock loads are experienced in a rigging system when the rigged piece is “snubbed off” and not gradually decelerated.

Avoid "snubbing off" whenever possible. Testing and research show the block and sling can experience more than double the shock-load force in this situation

Running Bowline with Half Hitch

These knots are used in conjunction with one another to attach rigging lines to tree sections that are being rigged for removal. The running bowline is easily untied. It securely chokes the piece when steady pressure is applied. The half hitch increases safety and provides stability and holding power.

Adjustable Slings

Loopies or Whoopie Slings are an excellent alternative to the traditional timber hitch as they cannot come untied. The timber hitch can be used to attach a rigging block or a friction device to a tree to use as a lowering device to lower or hoist limbs. Tendency for the hitch to come untied can be minimized by tucking for a minimum of five wraps, spreading out the tucks over as much of the circumference of the trunk as possible, and ensuring that the hitch is loaded “against the bight” whenever possible.