Breastlines & Brail Lines: Difference between revisions
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*Have a think about that next time you are on the | *Have a think about that next time you are installing running brails ...see below* | ||
== Brail Lines == | |||
Brail Lines are normally lines tied from the flyfloor to the ends of the counterweight bar. | |||
The purpose is exactly the same as a breastline, to deviate a counterweight bar up or downstage. | |||
They are very common in theatres where the flyman can reach the end of the bar from the flyfloor and in those venues you would normally find a collection of small ropes on the flyfloor, perhaps with snap hooks for this purpose. | |||
The flyman would lean out from the flyfloor, clip to the end of the counterweight bar, pull the line tight and cleat off to the pinrail. | |||
This is not common at RCS due to the fact we cannot reach the ends of our counterweights from the flyfloors | |||
== Running Brails == | |||
Sometimes it is necessary to deviate a moving (flown) piece and in this scenario neither a breastline or brail will work. | |||
Therefore we use Running Brails | |||
Running Brails are pulleys which are used on the counterweight suspension lines on the grid. | |||
The pulley is then tied off under tension to the supporting structure of the grid (ideally close to the grid floor) and the pulley allows the counterweight suspension line to run while it is under tension | |||
Be aware of the forces that could be applied however (see the Breastline maths above) | |||
This should only be used for small deviations and remember you should always try to move static flown items in the first instance. | |||
