Riding From The Snow Up 2/10/02. Riding From the Snow Up. Ron LeMaster 2/10/02. The Text Book. Ron LeMaster 2002 All rights reserved 1
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1 Riding From the Snow Up Ron LeMaster 2/10/02 The Text Book Ron LeMaster 2002 All rights reserved 1
2 My Approach Look carefully at the best skiers Distill what is common Seek an explanation for why it works Technique and Methodology Technique The movements that the athlete makes, as described objectively by an external observer This is not what you teach Methodology The information presented to the athlete with the intention of eliciting the desired behavior Usually subjective in nature (kinesthetic, visual, emotional) Ron LeMaster 2002 All rights reserved 2
3 The Rider s Objective Control speed Control direction In other words, control velocity Fundamental Mechanics Ron LeMaster 2002 All rights reserved 3
4 Center of Mass Hips and CM The CM is not usually in the rider s hips Ron LeMaster 2002 All rights reserved 4
5 Methodology and Technique Teaching method Keep your hips over your feet. Technique Keep your center of gravity over your feet. Line of Motion The path followed by the skier s CM At every point in time, it points in the direction of the skier s momentum Ron LeMaster 2002 All rights reserved 5
6 Force A push or a pull Something that causes a change in the motion of a body Has two parts Magnitude Direction Force is related to pressure, but not the same thing Is centrifugal force really a force? Ski/snow friction causes linear deceleration only. Ron LeMaster 2002 All rights reserved 6
7 How Things Turn The ball undergoes radial acceleration Where does the force come from? The Snow Turns the Rider Ron LeMaster 2002 All rights reserved 7
8 The Snow Turns the Rider How a Board Carves an Arc Ron LeMaster 2002 All rights reserved 8
9 Steering Angle The angle between the mid-body of the board and your line of motion To change your line of motion, the board must have a steering angle The board s sidecut gives it built-in steering angles Self-Steering Effect First, the board must turn. Then, you turn. The middle of the board makes you turn The tip and tail make the board turn The board cuts a groove in the snow like the inside of the bowl Ron LeMaster 2002 All rights reserved 9
10 Sidecut vs Reverse Camber How Can We Tighten the Arc? Ron LeMaster 2002 All rights reserved 10
11 Inclination Inclination Gravity and centrifugal force combine to form the resultant force on the rider The amount of inclination needed in a given turn is dictated by the direction of the resultant Ron LeMaster 2002 All rights reserved 11
12 Inclination Ron LeMaster 2002 All rights reserved 12
13 Inclination As newer equipment holds better, the rider must balance against larger forces, requiring More inclination Better physical conditioning Gs - Resultant Force Ron LeMaster 2002 All rights reserved 13
14 Gs - Resultant Force Fundamental Movements How the rider affects the board s control parameters Up and down Fore and aft Edging Pivoting Balancing laterally Ron LeMaster 2002 All rights reserved 14
15 Fundamental Movements The rider makes them to for different reasons Therefore, the rider should be able to make them independently The technically sophisticated and subtle rider can mix and match the movements to fit the situation. Balance and Transition Ron LeMaster 2002 All rights reserved 15
16 Balance There are two types of balance Static Dynamic The terms are commonly misused by instructors A boarder is rarely in static balance, and never in dynamic balance when riding Riding is like a broom balanced on your hand Transition In a turn, the rider s feet must follow a longer path than the CM Path of CM and path of feet must cross between turns Cross-over vs. cross-under Difference is perceptual, not mechanical Ron LeMaster 2002 All rights reserved 16
17 Transition The crucial move in snowboarding The beginning snowboarder must learn skills that advanced for a skier Timing the moment of edge change Controlled toppling Estimation of anticipated force Ron LeMaster 2002 All rights reserved 17
18 Ron LeMaster 2002 All rights reserved 18
19 Transition Mechanics Board tightens its arc, so CM falls to the outside Feet and board slow down, e.g. via an edgeset, and CM topples across the feet By relaxing key muscles, upper body disengages from feet and its momentum carries it across Ron LeMaster 2002 All rights reserved 19
20 Edgeset Skis Tighten the Arc Ron LeMaster 2002 All rights reserved 20
21 Flexion Swapping Sides Ron LeMaster 2002 All rights reserved 21
22 Methodology and Technique Teaching Method Project your center of mass down the hill. Technique Put your body out of balance so your line of motion crosses the path of your feet. The Virtual Bump Even on a smooth slope, turning creates a bump by Going in and out of the fall line The path of the upper body crossing over that of the feet Ron LeMaster 2002 All rights reserved 22
23 The Virtual Bump The Virtual Bump Ron LeMaster 2002 All rights reserved 23
24 Redirecting the Board Turning the Board Rotation Board must be engaged in the snow, then disengaged Counter-rotation Board must be free of the snow Differential slipping Pressure must be shifted toward one end of the board Ron LeMaster 2002 All rights reserved 24
25 Rotation Rotation and Counter-Rotation Ron LeMaster 2002 All rights reserved 25
26 Thanks for Coming! Ron LeMaster 2002 All rights reserved 26
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