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How does he do this? It's impossible!

post #1 of 12
Thread Starter 
At 1:47 in the video (it's a trailer for MSP's Yearbook - so the whole thing is great!)
http://www.whistlerblackcomb.com/video/msp.htm
I remember someone saying it would be impossible to start spinning after you left the jump...so how is this guy changing directions in mid-air???
That's what I call an impressive trick!

Also: there is a great follow cam shot at 1:36 that might help with 360's/720's - check how he slows his spin down just before he lands, in order to land correctly. People tend to think everything is rushed in the air, but if you have decent air and you're in control you can make adjustments in flight, as this shows.

...and don't miss the wipeout that ends the clip.:
post #2 of 12
Who said it was impossible to start spinning after you leave the ground? You can do this at home... just jump straight up in the air and on your way down you can get in about a half spin in either direction (depending on how high you jump).

Cool video though!
post #3 of 12
What the heck are you talking about? The guy spun a leftside 540. There was no direction change. And he started the twist with his upper body with his arms out as he popped, leaned to the left, and then pulled them in to speed up the twist.

Doing a 180 without twisting off the start is a little different since all you're doing is rotating your hips. You need contact resistance at some point in order to get significant movement, especially with skis on.
post #4 of 12
You can either spin your whole body by starting at (actually, before) the take-off, or you can spin each part of your body in opposite directions (counter-rotating). Once you leave the ground, it is not possible to start a real spin (what would the equal-and-opposite reaction be?).
post #5 of 12
I agree with Warren. I ran it twice and never saw anything remotely like a direction change.

BTW, will someone please tell me what's so cool about watching this stuff? I just don't get it. Give me snorkle pow over this air gymnastics any day. I don't even think it's all that much fun to watch!
post #6 of 12
It is a bad angle since you only see the silouhette of the skier and (ignoring physics) it sorta looks like he stops after the first half rotation and goes the other way.
post #7 of 12
Are we all watching the same skier? I agree with Old School.
post #8 of 12
Newton's First Law of Motion: Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it.

Using the principle of Occam's Razor which is more believable: that the skier in question (Mark Abma?) ignored Newton's First Law and was able to stop and completely reverse his initial motion with equal momentum without any external force OR that it's an optical illusion caused by the camera angle and backlighting?

Come on folks, this is not the Matrix...
post #9 of 12
It's caused by the skier altering the rotational momentum differential of the upper and lower body. Or something like that. It is probably not possible to do with very short skis.
post #10 of 12
It was a 540. Period

Unless the guy was wearing some sort of gyroscopic missle guidance system it is impossible for him to spin 180 in one direction then immediately spin 360 in the opposite direction.
post #11 of 12
Quote:
Originally Posted by warren
Newton's First Law of Motion: Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it.
Who ever said a skier's body is in a state of uniform motion? Different parts of the skier's body are in constant motion in different directions. All you have to do is start your rotation before you leave the jump, then use counter-rotation while in the air to initiate a spin in the opposite direction. In snowboarding it's called a rewind or a shifty. I don't know what the biggest rewind ever pulled is but rewind 180s aren't considered that hard.

Garrett
post #12 of 12
Don't know about the spinners, but there was some nice footage on how to ski steeps, and how not too.
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