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| Pregunta | Respuesta |
| What are the two types of Rigging? | Arena Rigging: Temporary Theatre Rigging: Permanent |
| 4 K's of Rigging | 1. Know the Rigging Equipment. 2. Keep it in a safe working condition. 3. Know how to use it. 4. Keep your concentration. |
| Newton's Third Law is? | For every action there is an equal and opposite reaction. |
| 4 types of force? | 1. Tensile: Tension 2. Compressive: Pushing Force 3. Shear: Sliding Force 4. Torsion: Twisting |
| Ultimate Breaking Strength? | The Point at which the object breaks. |
| What is the Working Load Limit? | The Force or Load that a piece of Rigging equipment can safely handle without breaking. |
| What is the Design Factor? | The ratio of the working load limit to the ultimate breaking strength. |
| What are the 9 Strength Reduction Factors? | 1. Chemicals 2. Overloading 3. Wear 4. Light 5. Abuse 6. Temperature 7. Knots 8. Bends 9. Components |
| What is the effect of the Bowline knot and the Clove Hitch Knot on the strength of a rope? | 1 Bowline = 50% Reduced rope strength 2. Clove Hitch = 25% Reduced rope strength. |
| What are the unpredictable forces? | 1. Fatigue: Caused by the repeated applying and removing of force on an object. 2. Shock Loading: The rapid application of Force to an object, usually caused by rapid acceleration or deceleration. |
| Everything hanging from the truss must have? | 2 points of contact. |
| When hanging speakers from the truss, what do we have to take into consideration? | Only use manufacturer approved rigging points, do NOT use the HANDLES! |
| Arena Rigging: The basic tools of the trade are? | 1. Fall Protection 2. Slings 3. Hardware 4. Hoists |
| What is a Sling? | A flexible strap or belt in the form of a loop used to support or raise a weight. |
| What are the common Wire rope lengths? | 2, 5, 10, 20, 30 or 50 ft. |
| When setting up our Spanset's, the label should always be? | Visible. |
| Every Shackle must display what? | The Working Load Limit, the Size, the name of the manufacturer, and country of origin. |
| What does a Choker Hitch do? | A choker hitch wraps a sling around the beam and shackles the eyes to the standing part of the sling. |
| What does a Direct Hitch do? | Connects slings eye to a fitting and the beam. |
| What is a Basket Hitch? | -A Basket hitch wraps the Sling around the beam so the cable eyes are brought together and shackled to each other. -This is the strongest hitch. |
| What is Burlap used for in terms of rigging? | Required when you are wrapping around a beam with a basket or choker hitch. -Used to prevent kinks in the wire rope or general wear and tear on the steel as it is attached to the buildings beams. |
| Once everything is attached to the beams, how do we get it to where we want? | Dead HangsDeadhangs are used wh Breast Lines Bridles |
| Dead Hangs are used when? | Dead hangs are used when the beam is directly over where we want our load to live. -Easiest and fastest method |
| Breast lines are? | Slings that pull a dead hung object a few feet, vertically. |
| Bridles are? | A bridle has two legs, one for each beam to bridle junction. -It is used when the desired point location is not directly below the beam. |
| Deck Chains are used to? | Make adjustments to a bridle. -Design factor of 4:1. |
| Two types of hoists are? | 1. Chain Motors 2. Chain falls |
| What is a Line Array? | A line array is a group of omni-directional radiating elements arrayed in a straight line, closely spaced and operating in phase with equal amplitude. |
| What is a Loudspeaker Line array? | A group of loudspeakers set up in a line. -Acts differently than the individual speakers would normally. |
| A line array achieves directionality through? | A combination of constructive and destructive interference patterns produced by the interactions of its different elements. |
| What does phase interference do in terms of Line arrays? | Narrows vertical coverage of individual speakers. |
| In order for a system to function as a line array it must? | Physical spacing between the acoustical centers of the different elements in the array must be less than or equal to one half of the wave length of the highest freq. to be reproduced |
| What are Wave guides used for? | -We cannot create nearly enough HF drivers within our loudspeaker array for the speaker to perform as a line array, so we used Wave Guides. -Wave guides provide narrow vertical coverage. |
| What is an important design element of Wave Guides? | It's extremely important that each "path" in the wave guide is the same physical distance, otherwise the HF signal will be at diff phase angles when it leaves the loudspeaker. |
| 3 goals of Line Array Design? | -Uniform frequency response -Uniform SPL -Sufficient SPL |
| Vertical coverage options for a line array? | Straght Array- All boxes at 0 degrees Curved Array- All boxes over a specific angle. ex: All boxes set at 5 degrees. "j" configuration: Line array is J shaped, angles are only different for the last 3-4 speakers. |
| Strategies for deploying line arrays? | Create zones: Near field, Mid field, Far field. (This is usually done in the software) |
| Eq strats for each zone? | Far zone; Possible boost Mid zone: Possible Hf reduction to compensate for shorter throw distance. |
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