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Technical Design Solutions for Theatre by Don Harvey, Ben Sammler

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Jon Ldgerquist

Rotating Flats While Flying

 

Fying flats that, at low trim, are not parallel to the plaster line can be a challenge. The rig described here provides a means to fly a flat on a single lineset and have it rotate into a different orientation automatically as it flies in or out.

OPERATION

In this rig, four lines are attached to each of two pickups on the flat. See Figure 1. Lines a and b are attached to a batten: lines c and d pass through pulleys on the batten and are secured at the grid directly above the batten pickups. At low trim, all four lines share the load, and line tension holds the flat at an angle to plaster. During the out, a and b gradually assume the full load, swinging the flat parallel to plaster.

Figure 1A

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