kayaking: eskimo rolls
Post on 24-Feb-2016
Embed Size (px)
DESCRIPTIONKayaking: Eskimo Rolls. Alyssa Van Patten. Initial/ Prep Phase. Rotate hips to the left Lean trunk forward and to the left Bring paddle to the left side, parallel to the kayak Right hand paddle is parallel to the water, not perpendicular “Kiss the deck”= lean forward, head down. - PowerPoint PPT Presentation
Kayaking: Eskimo Rolls
Kayaking:Eskimo RollsAlyssa Van Patten
VIDEOCut roll into three phases:Initial/prep phaseSweepRecovery1Initial/ Prep PhaseRotate hips to the leftLean trunk forward and to the leftBring paddle to the left side, parallel to the kayakRight hand paddle is parallel to the water, not perpendicularKiss the deck= lean forward, head down
1. Rotate hips to the left, lean torso forward and to the left, bring paddle to the left side of the kayak (parallel)- the paddle on the right hand is parallel to the water and not perpendicular. Kiss the deck= lean forward, head down
2Sweep PhaseBack paddle close to the boatSweep the front paddle out, bending the elbowRelax upper bodySnap left hip into extKeep head downTiming of segments: hips trunk shoulders headEyes on hands
2. Sweep- After youve capsized, start sweeping out with your body, taking the paddle with you (keep the paddle in towards the kayak- if it gets too far out it will pull your body out of the tuck and stop you from going all the way around). Once the kayak is coming back out of the water, relax the upper body and snap the hips into extension and to the left. The right hand is going to sweep out as you snap your hips into extension. Keep the head down, it is the last thing to come up out of the water. It should go hips push up, torso, shoulders, then head. Keep your eyes on your hands and it will help you keep your head in the water.
3Recovery PhaseTrunk leaning backwardsBring head upBring trunk forwardsBring paddles back up to parallelBalance self
3. Recovery- As you sweep up and bring your head up, your torso should be leaning backwards and you should bring the paddles back up into rowing position (parallel) to balance yourself out again. You do not use the upper body at all during the motion, it should just come from the hips
4BiomechanicsAcrobaticsRotating about an axis through waterBalanceGetting the COM over the BOS and keeping the kayak upright
AcrobaticRotating about an axisCreate torque to force self off center and start rotatingSmall moment of inertia- get as close to kayak as possible- less resistance to stoppingPushing hips up (hip snap) and leaving behind the upper body to counterbalanceThis is an acrobatic movement through waterRotating about an axis In order to force self off center and to start rotating, create a torque by leaning the whole body to one side and pushing off with the hipsIn order to do it faster, you want to get as close to the kayak as possible to get a small moment of inertia- less resistance to stopping (coming from the water).
6BalanceDuring hip snapCOM in the center of the boat near the hipsHips snap up, COM will quickly get in line with BOSIf upper body goes first, COM is too low to bring the kayak upRecovery PhaseBringing the paddle parallel to the water and the trunk upright will stabilize and bring COM in the center of BOSBalanceIn order to bring the kayak back up to resting position, the hips are snapped into extension and the upper body trails behind. This keeps the boat balanced and brings the COM upwards and over the BOS. The majority of the COM is in the center of the boat near the hips so if the hips are snapped upwards before the rest of the body, the COM will quickly get in line with the BOS. If the upper body goes first, the BOS is left behind in the upside down kayak so you will have trouble turning it around with only the upper body.
7Other FactorsTiming of Segments Hip snap trunk upper body headFear of being upside downVision
Other factorsTiming of segments- When getting the kayak upright you want the hip snap torso comes up upper body arms head. If any of these are off then the boat will not come back uprightFear- fear of being upside down may make some people freak out and forget about the steps to getting them back uprightVision- not being able to see (or not see well) while you are in the water may prevent people from seeing where they are in their roll
8ObservationPrep PhaseCheckObservationsCommentsRotate hips to the leftLean trunk forward and leftPaddle to left sidePaddle parallel to kayakRight hand paddle parallel to waterHead downTight tuckPrep phaseRotate hips to the leftLean torso forward and to the leftPaddle to the left side of the kayak (parallel)Paddle on the right hand is parallel to the water and not perpendicular. Head downTight tuck9ObservationSweep PhaseCheckObservationCommentsRelaxed upper bodyTrunk perpendicular to kayakQuick left hip extensionRight paddle sweeps outLeft paddle stays in closeTrunk leans backTiming of segments: hip snap trunk arms headNo use of upper body strength or paddleSweepRelaxed upper body (perpendicular to kayak)Snap the left hip into extension The right paddle sweeps out as you snap your hips into extensionTrunk leans backTiming of segments: hip snaptrunkupperbodyheadNo use of upper body strength or paddle10ObservationCheckObservationsCommentsRecovery Phase Bring trunk up straight Paddles in rowing position Balanced on both sidesOverall Smooth/fluid motion Quick ControlledRecoveryBring torso back up straightPaddles in rowing positionBalanced on both sidesOverallSmooth/fluid motionQuickControlled
11ObservationView from front and 45 degree angleHigh-speed, water proof cameraListenEnvironmental factorsWeatherWater conditionsType of kayakGear
Want to watch from the front of the boat to see ROM, twisting, snap of the hip, and timing of segmentsWant to watch from a 45 degree angle (front/side). You want to be able to watch from an angle from the start of the position to be able to see the whole movement and tuck. Then you want to watch from the other side to be able to watch the timing of segments and how they come up. If you watch directly from the side you may miss some key points of the movement due to splashing and the paddle getting in the way. Watching from an angle towards the front will help you avoid that.Want to use a high-speed camera because it is such a fast movement, but may also want to get one that is waterproof so you can see movement under the water as well. Listen for any unusual slapping on the water that might signify them trying to use their paddle instead of their hips to get out of the waterConsider environment:Weather conditions- precipitation, temperature, wind, etcWater conditions- you want a place to practice that is relatively calm- no waves. Use a pool or inletType of kayak- length, width. Shorter and thinner are easier to roll (less mass)Gear- clothing/accessories. Might want a swim cap, nose plugs, goggles, wetsuit. Will definitely want skirt for the kayak so you keep water out when you roll.
12EvaluationFirst watch overall movement to make sure they are getting upBreak it into the three partsWould watch the sweep phase first to make sure they got the hip snap above everything elseThen watch the other phases
I would segment the roll into three parts: the initial roll/ prep phase before they get into the water, the snap back up and timing of the segments, and then the balancing back upright again. Plan would be to correct the most important aspect of the movement first, and then branch off from there depending on what I seeThe biggest thing I would look for to correct first is the use of their hips. If they are not using their hips to snap them back upright then the whole movement will be off. If it looks like they are using their upper body first instead of their hips, then I would make sure to correct thatOnce they have that down, then I would look to fix minor problems such as not having the right paddle parallel to the water while initially rolling, or how far they might lean backwards when they come back out of the water, or the sweeping motion of the paddle as theyre snapping their hips, etc.VIDEO-What do you think went wrong during this movement?13Implement Intervention#1 = get over fear of being upside down in water#2 = fix the biggest problem in their techniqueUsually using upper body instead of hip snap#3 = Practice each phase separatelyGetting into roll tuck positionPracticing hip snap and sweepMoving hips back and forth in kayak for balance (recovery phase)#4 = Fix minor technical problems after thatFirst would have to get them used to being upside down in a kayak so they can get over the fear of being underwater and not breathing.If any of the three parts are off I can have them practice only those parts in the pool. Have them practice getting into the roll tuck, have them practicing the hip snap, and then have them balancing in the kayak by moving their hips back and forthWhats wrong?: Using their upper body to bring them upright instead of a hip snapIn order to really correct this I can show them what theyre doing with a video, show them what the right thing looks like, and then have them practice. Practicing would be getting them into the pool, having them hold onto my hands and having them practice using their hips to snap them back upright (VIDEO)