Body Position Explained

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Firewa11
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Body Position Explained

Post by Firewa11 » Wed May 25, 2011 11:08 am

Excellent find by NickS!
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Re: Body Position Explained

Post by DarcShadow » Wed May 25, 2011 11:36 am

Shite tyres
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You can't be bothered with all the poncing around. you'd rather overtake people with buttocks on foam.
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Interesting on the difference with the hanging of crouched vs more upright. Guess the question then becomes is the wind resistance from sitting up slowing you down more then what you'd have to slow for to be able to take the turn tucked in.
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Re: Body Position Explained

Post by DemonDuck » Sun May 29, 2011 1:33 am

Yea it is a good read ... but the one thing that stands out to me is that sitting up part. Never heard it said like that or even close to that. It makes some sense but then it dont... I cant decide which way is best without doing it so I guess my days off Ill test it out a little. If I can figure out how to test it.
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Re: Body Position Explained

Post by fixxervi6 » Sun May 29, 2011 2:02 am

DemonDuck wrote:Yea it is a good read ... but the one thing that stands out to me is that sitting up part. Never heard it said like that or even close to that. It makes some sense but then it dont... I cant decide which way is best without doing it so I guess my days off Ill test it out a little. If I can figure out how to test it.
In that pic sitting upright moves more weight to the inside further from the wheel to the left in the pic, but higher is also going to increase force to the outside.
http://en.wikipedia.org/wiki/File:BikeLeanForces3.PNG

I'm suspect of the lean angles/speeds in those pictures, he also doesn't have his leg out in the crouched one, he also is not putting his upper body off in the crouched one either. Also the one where he is sitting up you can clearly see more upper body mass to the inside, follow the divider line all the way up.

Think about when you have a passenger, you can feel that weight up high, well, on a 750 you can, lower is better
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Re: Body Position Explained

Post by DemonDuck » Sun May 29, 2011 2:04 am

Yea I have always thought that lower would be better as long as you put your body as far off.
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Re: Body Position Explained

Post by fixxervi6 » Sun May 29, 2011 2:10 am

DemonDuck wrote:Yea I have always thought that lower would be better as long as you put your body as far off.
even if you don't hang off your going to increase stability by having a lower center of gravity, draw it on paper and exaggerate the forces in both situations.

Then look at those drawings and think about throwing that through some twisties and how they would feel/react
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Re: Body Position Explained

Post by DemonDuck » Sun May 29, 2011 3:25 am

True ... heck take it out of motorcycles and think about sports .... if you are lower it is easier to change direction without loosing your footing. I would like to figure out where the whole being upright = better cornering speeds comes from.
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Re: Body Position Explained

Post by DarcShadow » Sun May 29, 2011 3:59 pm

The upright factor, is that, IF you're still directly over the center of the bike, then the center of gravity is going to me more off center of the bike which means you don't have to lean as far to go the same speed.

If you're tucked in, which lowers your CG, but you stay in that exact possition as you lean, the CG is low, yes, but it's still in the center of the bike, not off to the side, or at least not as far as if you're sitting more upright. Both cases are "wrong" though as you're still inline with the bike and not ideal for fast sharp turns.
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Re: Body Position Explained

Post by DemonDuck » Mon May 30, 2011 3:36 am

Ok but would sitting upright but off the side be better than tucked and off the side?
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Re: Body Position Explained

Post by DarcShadow » Mon May 30, 2011 2:45 pm

possibly, but not necessarely. You're starting to get into some rather complicated CG calculation compairsons and a general statement would not work since there are so many factors that would need to be taken into consideration.
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Re: Body Position Explained

Post by Rhino » Mon Jun 06, 2011 8:47 pm

I like the "my fat ass isn't flexible so upright is better" explanation the best.