Counter Weight Flying: Difference between revisions

This type of flying allows scenery to be counter balanced by a vertically travelling cradle which is attached to steel wires which run over a series of pulleys in the grid which all terminate on a fly bar. To operate the system control lines are tied off to each end of the cradle, this allows the operator to move the bar either in or out. By pulling the rope down the bar will move towards the stage and by pulling the rope up the bar will move towards the grid.  

“Single Purchase” simply means that to lift a certain load the same amount of “effort” is required.

Double Purchase sets are installed when the cradle cannot have the same travelling distance as the fly bar. With the cradle only travelling half the distance and the control line having to travel through an extra set of pulley blocks then the weight in the cradle must be double that of which is on the bar in order for it to be balanced. Although the travelling relationship between the bar and the cradle is doubled the control line still operates on a 1:1 ratio due to it's double drop above and below the cradle.

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