AASI SNOWBOARD TECHNICAL MANUAL Table of Contents


ACKNOWLEDGMENTS .............................5 FOREWORD .............................................7


INTRODUCTION .......................................9 Values: Safety, Fun, and Learning ........................9 Snowboard Teaching System ............................12 AASI: Past, Present, and Future .........................12 Snowboard Technology and Technique...............16 The Y Model ....................................................16 Professional Development ................................19 How to Use this Manual ....................................20


CHAPTER 1:


PHYSICS OF SNOWBOARDING ...............21 Objectives .......................................................21 Introduction .....................................................21 Snow ..............................................................21 The Board-to-Snow Interaction: Friction .............22 Force ..............................................................22 Angular Momentum .........................................23 Newton’s Laws of Motion ..................................23 Inertia .............................................................24 Momentum ......................................................24 Trajectory ........................................................24 Pressure ..........................................................25 Center of Mass ................................................26 Equilibrium ......................................................29 Summary ........................................................29


CHAPTER 2:


EQUIPMENT .................................................31 Objectives .......................................................31 Introduction .....................................................31 Soft Goods.......................................................31 Hard Goods .....................................................32 Snowboard Construction...................................32 Snowboard Anatomy ........................................33 Boots and Bindings ..........................................38 Stance ............................................................41 Rental Equipment .............................................42 Summary ........................................................44


CHAPTER 3:


BOARD PERFORMANCE CONCEPTS ........45 Objectives .......................................................45 Introduction .....................................................45 Board Performance Defined ..............................45 Tilt .................................................................46 Pivot ...............................................................48 Twist ...............................................................51 Pressure ..........................................................53 Board Performance and Movement Blending .....54 Summary ........................................................55


CHAPTER 4:


BIOMECHANICS OF SNOWBOARDING ....57 Objectives .......................................................57 Introduction .....................................................57 Planes of Motion ..............................................57 Anatomy ..........................................................58 Summary ........................................................68


CHAPTER 5:


MOVEMENT ANALYSIS .............................69 Objectives .......................................................69 Introduction .....................................................69 The Movement Analysis Process .......................69 Step One: Observation ......................................70 Step Two: Evaluation ........................................78 Step Three: Prescription ...................................83 Summary ........................................................84


CHAPTER 6:


TEACHING ....................................................85 Objectives .......................................................85 Introduction .....................................................85 The Teaching Model .........................................85 Student Makeup ..............................................86 Instructor Behavior: The Teaching Cycle .............86 The Learning Partnership ...............................100 Summary ......................................................102


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TABLE OF CONTENTS 3


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