This was done by a team of people, our job was to put in the flying effects. The flying effects we had were the traverse track, centre point and the cranes.
 For the traverse line we started by putting the truss together on the floor and attaching one chain hoist at each end. Then raising it up about 8 inches off the ground, then putting half couplers with a special bolt and rectangular piece of metal that slides into a groove in the top of the track. After this we raised it in to the rig using the chain hoists. Once it was at the required height we attached it to load bearing rsj’s (reinforced steel joists) above the lighting bars, these are the main supporting structure of the building and will be able to withstand dynamic and static loads.
What is a static and dynamic load?
A static load is when a load does not moves or stretches where as a dynamic load is one that can move and stretch.
In the case of ropes a static rope can stretch 5%, a dynamic one can stretch 15/25%. Dynamic is not good for hauling as it stretches and could break under significant loads, where as dynamic is better for this task.
The strops we used were static 2 meter in lengths. To attach the truss we used something called a prusik loop, made from the strop. This is when you pass a bite of the loop around the pole and through itself 3 times, this is essentially a friction hitch and stops smooth objects from slipping it should look like this:
Then attached this to the rsj’s then backed it up in the same manor, so that if one fails the load is still supported.
On the traverse line there were 2 carriers basically a metal block with wheels, using a rope that we attached with a barrel knot which looks like this:
  Passed the free end of a static rope through a double pulley block then through another double pulley block.Then down to a single pulley, then ran it the opposite side of theatre where it goes through another pulley and is terminated and the other side of the runner. With another barrel knot and mirror for the other runner. How it works is you pull one line and the runner goes one way, you pull the other line and is goes the opposite way.
Next was the centre point, this is made from 5 main parts, the 2 pulley blocks, the cable, the dog and saddle and the termination block.
The termination block is a metal object with a wedge that puts a kink in the steel cable and stops it from pulling through. This means you can attach a karabiner to one end of the cable, it  then goes to a steel pulley block, that then goes to a second pulley and the cable is attached to the coat hanger. Which then attaches to the actor with stingers. Stingers are short steel cables with eyes in each end. How a centre point works is a fly man goes up a ladder, the actor goes down. When the fly man goes down the actor goes up, this is called a human counter weight and it is vital that the fly man weighs more than the actor. If not there are ways to counter this have a rope attached to the fly man and pull them down.
The cranes were made from 2 pieces of light deck, a steel piece of square truss with steel pivot brackets at one end and a 3 meter and 2 meter length of light truss; also a pivot pin made of a solid steel cylinder.These worked in the same way as real cranes do, with two alterations. Firstly we had 2 people on each one pulling down and secondly we had a spine walker which was someone that walked on top of the crane.This is to make the balance point easier to tip ether way or balance in the middle. This was achieved by the spine walker walking forward to make the balance point go forward, thus lowering the arm or backward to raise the arm. Â Â