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post #1 of 12 (permalink) Old 02-21-2013, 06:48 PM Thread Starter
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center of mass

Hi,

what should I do to keep my center of mass over the edge? there shouldn't be too much inclination? I dont understand this concept... pls help

i apologize for my english
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post #2 of 12 (permalink) Old 02-21-2013, 08:25 PM
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think of your board as the bottom of a cereal box...keep all your body parts inside the box. and the box does tilt...but generally your body...or really your mass/center of gravity is also tilted/aligned/stacked over the bottom of the cereal box

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post #3 of 12 (permalink) Old 02-22-2013, 09:02 AM Thread Starter
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so suppose that my inclination during turn is 45 degree (i'm in the "box" so board's angulation is 45 too - center of mass over board) but i angulate the board by ankles by 2 degree. Probably center of mass is not over the board now? I have to increase inclination in this case to return center of mass over the board?

I know it might be too theoretical but i'm curiouse about it

Is it possible to be stable in the turn when my mass center isnt over working edge?

And how center of mass is related to centrifugal force?

i apologize for my english

Last edited by Artu89; 02-22-2013 at 09:09 AM.
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post #4 of 12 (permalink) Old 02-22-2013, 09:26 AM
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Uh..umm..
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post #5 of 12 (permalink) Old 02-22-2013, 10:11 AM
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Quote:
Originally Posted by Artu89 View Post
so suppose that my inclination during turn is 45 degree (i'm in the "box" so board's angulation is 45 too - center of mass over board) but i angulate the board by ankles by 2 degree. Probably center of mass is not over the board now? I have to increase inclination in this case to return center of mass over the board?

I know it might be too theoretical but i'm curiouse about it

Is it possible to be stable in the turn when my mass center isnt over working edge?

And how center of mass is related to centrifugal force?
umm...idk...but you also are probably lowering your cog because you are squating instead of standing straight legged....so the relative position or angle to pressure the edge is different. I'd imagine also you are entering and exiting the box and angle differently using cross under turns vs cross over turns and the angle of attacking the snow/fall line is going to be more parallel with the fall line...instead of transversing it.

....its kind of using 4 dimensional space....x, y, z and moving/time/speed instead of your above perspective which seems more 2 dimensional.


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post #6 of 12 (permalink) Old 02-22-2013, 10:40 AM
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If you draw a line from your center of mass - which is usually just behind the belly button -- through the center of the board, that'll give you the vector at which the board is pushing against the Earth. Assuming you're balanced of course. If you just lean over while standing still, you'll just fall over. The amount of lean should just balance the "centrifugal force" so that you stay on your board through the turn. Angling the board is an additional complication. It doesn't affect center of mass or the angle of the vector, but it does affect whether or not your board is able to hold you in the turn. Put the board too flat and you'll slide out.

Of course there are things you can do to affect your center of mass. For instance, sticking your arms out in front of you will shift your center of mass forward, requiring more lean. Squatting will shift your center of mass back.


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post #7 of 12 (permalink) Old 02-22-2013, 11:01 AM
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This is interesting because I couldn't explain this technically and scientifically speaking if I wanted to, but I can feel everything that is being explained above through the board and my body every time I ride. It's like a conversation of relativity between the two.
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post #8 of 12 (permalink) Old 02-22-2013, 03:09 PM Thread Starter
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thx guys for replies

The last question:

Here:


mass center is over the edge, otherwise it would be wipeout?

i apologize for my english

Last edited by Artu89; 02-22-2013 at 03:14 PM.
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post #9 of 12 (permalink) Old 02-22-2013, 03:43 PM
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He's probably going fast enough so the centrifugal forces outweigh the force of the gravity. (Did this come out right? )

It's the same as those MotoGP riders when they're hanging all the way into their turns. One little slip and you're on the ground though.
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post #10 of 12 (permalink) Old 02-22-2013, 04:56 PM
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MotoGP is the shit! Can't wait for this season...Rossi back on a Yami!
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