Counter Weight Flying: Difference between revisions

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'''Single Purchase'''
'''Single Purchase'''


The simplest form of counterweight flying is single purchase. On a single purchase set the weight in the cradle should be equal to that of the weight on the bar. At RSAMD one 'whole weight' is equal to 12Kg one 'half weight' is equal to 7.5Kg. For every foot of control line moved the bar will also move one foot. In order for a single purchase system to work the cradle would have to have the same travelling distance of the bar however this is not always possible and so double-purchase systems are installed.
“Single Purchase” simply means that to lift a certain load the same amount of “effort” is required.
 
 
With a single purchase counterweight set the same amount of weight is loaded into the cradle as is placed on the bar in order to “balance the set”, the weights become the “effort” required to lift the load rather than your arms which is good news for us compared to the hemp sets.
 
 
Note in the diagram below that the scenery is supported by 4 steel wires, which are attached to the top of the “cradle” which we now know holds an equal amount of weight.
 
 
 
The set is considered to be correctly weighted (balanced) when an operator can, let go of the control line and neither the scenery nor the cradle move.
 
The control line allows the operator to control the movement of the cradle, and therefore the scenery. The rope is moved in the same direction as the travel of the bar, i.e. when the rope is pulled down the bar will travel down toward the stage floor and vice versa. The cradle also moves exactly the same distance as the bar but in the opposite direction i.e. when the cradle moves up 6m the bar will travel down 6m, towards the stage floor.
 
I realise this is fairly hard to understand on paper but you will have the opportunity in the first weeks of term to try out the flying system and then refer back to these notes. I hope they will then become clearer.
 


'''Double Purchase'''
'''Double Purchase'''
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