I added the rest of Part II. I hope these make sense. Skating terms are difficult to translate for me (pika14)
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Data Man Part II
http://www.dailymotion.com/video/x2dnf8h_データ-後半_sport
Mr. Himura tried to jump. Takeshi did a double jump on land.
Talked about the edges of skates.
The edge work affects the speed of skating before jumps.
Yuzu’s skating speed before 4TL jump is 6.90m/sec. The reason why he can skate that fast lies in his three turn.
If the curve of the three turn is gentle, when you turn, more friction is caused to slow down the skating speed. ((Why did they have to compare Brian Joubert to Yuzu?)) Yuzu’s curve is sharp, so he can keep the speed.
Less slowing down → faster speed going into a jump → a good jump
A three turn with sharp curves is possible by deep edge work.
(7:20~) to experience edge work
The time it takes to skate a rink without using edges takes = 1:15
The time it takes to skate a rink using edges = 0:36
Yuzu has been further improving on his skating skills since 2 years ago in Canada. They compared his three turn two years ago with that at Sochi. The difference is clear. (10:41)
Takeshi’s comment: To have a deep edge, you need to tilt your upper body, but it becomes more difficult to keep balance. But if you have a deep edge, you skate better.
This also makes it possible for him to jump in a flow (he does not need a long preparation before jumping).
Landing
They looked at the angle of inclination of Yuzu’s body when he lands his 4TL.
When a skater jumps, he/she not only jumps up vertically, but also jumps away horizontally. It causes momentum to move to the direction the skater jumped to. To land, the skater needs to stop the momentum/to absorb the shock by using your knee and ankle. If that is not enough, you move your upper body toward the front of your body to kill the momentum. Like Denis’s jump, if you bend your upper body deeply, it kills the speed too much and hence it does not give you a good flow out of the jump. The deeper the tilt is, more you slow down.
The angle of inclination of Yuzu’s landing posture is 43 degrees.
The angle of inclination of Patrick’s landing posture is 60 degrees.
The angle of inclination of Denis’s landing posture is 79 degrees.
The speed of running edge out of a jump does not slow down much in Yuzu’s case. This also makes his jumps beautiful.
The professor said Yuzu must have developed his inner muscles to support his upper body to make that landing posture possible and have practiced many times to be able to keep that posture.