Counterweight Systems – Theatrecrafts.com
There are (at least) two types of counterweight system: Single Purchase: The cradle travels the same vertical distance as the fly bar, from the grid, to a few feet above the stage floor. The counterweight frame therefore occupies the full height of the side wall of the stage.
Double Purchase Fly system - YouTube
21. 1.5K views 4 years ago. This video will explain the basics of a double purchase fly system. ...more.
Fly system - Wikipedia
A fly system, or theatrical rigging system, is a system of ropes, pulleys, counterweights and related devices within a theater that enables a stage crew to fly (hoist) quickly, quietly and safely components such as curtains, lights, scenery, stage effects and, sometimes, people.
Double Purchase - MRL Systems
Double Purchase. This type of counterweight flying system is commonly used where there is insufficient clear space for the necessary structural and moving components to be accommodated, this may be due to the fly tower roof structure, doorways at stage level or a desire to maintain a clear wing space.
A double purchase system is installed in buildings where space for vertical travel of the counterweight arbor is not sufficient for single purchase sets to operate. By doubling the lift cables around a pulley on the arbor, the batten will travel twice as far as the arbor.
BASIC SYSTEM OPERATION. When a batten is being lowered to the stage or “deck” the flyman notifies the crew on the stage by clearly calling out “Heads Up”. To fly a batten in pull down on the onstage purchase line. To fly a batten out pull down on the offstage purchase line.
Fly Systems - ia470.com
A double purchase system is similar, except that the load is on pull side, and arbor on the load side. The Arbor moves only one foot for every two feet of batten travel; can therefore be run from a flyrail located halfway to the ceiling, and still allow the pipe to come in to the floor.
Double Purchase Counterweight systems are widely used in the theatre industry to operate act drops, scene changes, masking cloths, lighting bars, etc. quickly and safely on a stage.
Overview of a Counterweight System - DeLong Rigging Solutions
Diagram of a Double Purchase System: Counterweight-double-purchase-diagram Download. It is important to remember that these videos are not masterclasses. They are general overviews designed to point you in the right direction and to instill an idea of what best practices may look like in your venue.
Double Purchase. Double purchase counterweight systems are sometimes used where the vertical travel of the counterweight cradle would be inadequate due to limited fly space or stage-level wing space. In systems of this type, the operating and loft wire lines are double-purchased so that the batten will travel twice the distance of the cradle.
- Some results have been removed