Rigging Math Made Simple

Author: Delbert L. Hall
Email: delbert@d2flying.com
Publisher: Spring Knoll Press

Trim Size: 8.5" x 11"
Pages: 146
ISBN: 0615747795
ISBN-13: 978-0615747798
Price: $19.95
Tentative Date of Release: March 1, 2013

Description: The job of an entertainment rigger is to safely suspend objects (scenery, lights, sound equipment, platforms, and even performers) at very specific locations above the ground.  The type, size and location of the structural members from which these objects must be suspended vary greatly from venue to venue.  Additionally, the size, weight, and location of each object varies from object to object.  To ensure that each object is safely suspended at the proper location, math is essential.   If you want to be a top-notch rigger, you have to know math.  Math does not have to be hard.  It is a lot like baking - you need a good recipe, and then you just have to follow it - EXACTLY.  The purpose of this book is to provide you with the recipe for solving rigging problems.  Once you learn the recipes, you will be able figure out many rigging problems.  This book is more than a list of formulas - it will also help users grasp some of the principles behind the physics of rigging.  By understanding these principles and the math behind them, entertainment riggers should be able to look at many rigging situations and determine if it is “obviously safe,” or “obviously unsafe,” without actually doing any math.  However, there are many cases where the load is just uncertain, or the answer is not obvious, and the math needs to be done.  This book may be of particular interest to individuals who wish to become a certified rigger.  Many of the mathematical problems and other information presented in this book are intended to prepare individual for the types of questions they might encounter on a certification exam – in both theatre and arena rigging.
Table of Contents
Part I.  Conversions
Lesson 1: Converting between Imperial and Metric

Part II. Pulley Math
Lesson 2:  Resultant Forces
Lesson 3:  Mechanical Advantage
Lesson 4:  Fleet Angles and D:d Ratios

Part III. Bridles
Lesson 5:  Bridle Lengths
Lesson 6:  Tension on Bridle Legs
Lesson 7:  Tension on a Horizontal Breastline
Lesson 8:  Three-Point Bridle Lengths
Lesson 9:  Tension on Three-Point Bridles

Part IV. Truss
Lesson 10:  Center of Gravity for Two Loads on a Beam
Lesson 11:  Uniformly Distributed Loads on a Beam
Lesson 12:  Dead-hang Tension on One End of a Truss
Lesson 13:  Simple Load on a Beam
Lesson 14:  Distributed Load on a Beam
Lesson 15:  Cantilevered Load on a Beam
Lesson 16:  Chain Hoists, and Truss, and Lights, Oh My!

Part V. Static and Dynamic Forces
Lesson 17:  Forces and Design Factors
Lesson 18:  Stretch of Wire and Fiber Rope under a Static Load
Lesson 19:  Shock Loads
Lesson 20:  Wind and Water
Lesson 21:  Other Rigging Stuff (that you need to know)



Appendix 1. Answers
Appendix 2. The TI-30XA Calculator
Appendix 3. Cheat Sheet of Formulas
Appendix 4. What Things Weigh
Appendix 5. Roundslings