THEA 103 1st Edition Lecture 12 Outline of Last Lecture I. How to move a wagon, How to stop a wagonOutline of Current Lecture I. RiggingII. Hemp SystemIII. Single Purchase Fly SystemIV. Double Purchase Fly SystemV. WinchesCurrent LectureI. Rigginga. Rigging is at its most basic: putting things up in the airb. Theory on rigging: If two people hold two ends of a rope with a 100 lb weight in the middle, they each hold 50 lbs. The same is true for a rope held by a man and a wall, theywill each hold 50 lbs. The same holds true for ropes suspended from the ceiling.c. Mechanical advantage: If a pulley system is used, a person can exert 50 lbs of force downon the rope, and lift the 100 lb weight. BUT you can’t get something for nothing. They pull 1 ft of rope, but the 100 lb weight only moves 6 inches. This is a 2:1 mechanical advantage.II. Hemp Systema. A pipe or a batten is used, and rope (natural or synthetic) but NOT wire.b. When batten comes down we call that coming IN. When a batten goes up, we call that going OUT.c. Sandbags: act as counterweights. A COUNTERWEIGHT: is used to offset the weight you are trying to lift. Think of a seesaw. There is a pivot point in the middle and a child sits onone end, which makes that side drop to the ground. If a child sits on the other end (providing a counterweight), then the first child can rise into the air.d. Pin rail is used: to lock the working end of the rope and hold things still. The ropes get belayed onto the pins.e. Hemp system: uses natural rope, and is “Pipe Heavy”III. Single Purchase Fly Systema. Uses Wire Ropeb. Arbor is a carriage or rack that contains weights, usually cast iron called pig iron. These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.c. Loading floor is where technicians add and remove counterweights from the arbors. (It can be on the actual stage floor for single purchase, and isusually located higher p, 60 ft off the ground for double purchase so they can add weight even when the pipe is at its lowest leveld. Hand pull: raises and lowers the pipee. In a single purchase setup, the loading floor is on the stage floor. This means you lost a lot of stage space in the wings to accommodate the arbors. The advantage of a single purchase system is that the counterweight requires a 1:1 ratio. You need to add one pound on the pipe for every one pound of arbor weightIV. Double Purchase Fly Systema. Loading floor is halfway between the stage floor and the loft blocks. There is an extra pulley, both above and below the arbor, to double the wire rope length. This is necessaryto make the system work properly. The pipe travels one foot for every 2 feet the rope has to travel. You need to use twice the amount of weight that is hung on the pipe. The advantage is that you lose no floor space.V. Winchesb. Winches are geared mechanisms that can be hand operated or motorized. They are usedto raise or move heavy equipmentc. Gearing produces mechanical advantage in both speed and load capacityd. There is such a thing as a counterweight assisted winch setup, which is an inbetween of the two systemse. Fully motorized systems also existf. Typical in theatre businessg. Dead Hung: example, a chandelier on a single line. Dead lift uses no counterweights, requires a lot of human strengthh. Spot line: temporary rig, single