Re: [ST] for Marc -

[Matthew Heyer <matthewheyer@xxxxxxxxx>]

You mean I should have stopped drinking during this thread!?!?  OK - give me 'till the morning to sober up....
 
MAtt Hyeer


----- Original Message ----
From: John Ulizzi <jaulizzi@xxxxxxxxxxxxx>
To: ST@xxxxxxxxxxxxxx
Sent: Tuesday, June 6, 2006 10:38:30 PM
Subject: Re: [ST] for Marc -


Yea, but what I would like to see is this conversation
continued at a rally AFTER you guys have all had many
cervesas....

:-)

John

--- Matthew Heyer <matthewheyer@xxxxxxxxx> wrote:

> Ummm - taking this too far.  From my mechanical
> engineering days in college, without either
> assumptions or a complete break out of the equation,
> there's too much to consider without getting way to
> serious about this.  But on face value, I'll take
> the word of the men who have actually experienced
> and done this (like Freddy Spencer).  
>  
> Matt Heyer
>  
> <<end of thread>>
>  
> ----- Original Message ----
> From: Emile Nossin <Emile@xxxxxxxxxx>
> To: ST@xxxxxxxxxxxxxx
> Sent: Tuesday, June 6, 2006 6:28:36 PM
> Subject: Re: [ST] for Marc -
> 
> 
> >From: Matthew Heyer
> >At full lean, the traction starts to give, the
> racer
> >with his knee already on the ground I assume exerts
> >to hold up the bike, traction is regained, and the
> >racer continues on (with assumed dirty underwear -
> 
> I've heard about that, I had another picture with
> knee pushing in my mind at first but I know what you
> mean now. I wonder about the dynamics of such a
> (scary)
> moment, I mean you can't hold up the full weight of
> the
> bike with the sideway pushing of your upper leg
> alone,
> right? So I'm guessing the front wheel has not fully
> lost
> "traction" yet, but is sliding out (like the rear
> wheel
> steering thing a bit) momentarily, with a corrective
> push of the knee to get more weight on the tire.
> Except
> that there's a flaw in that theory since you can't
> "push"
> against anything in that position with that leg. I
> mean
> you can push the knee sideways against the asphalt,
> but
> since it is a force applied in the horizontal plane
> (well,
> sort of horizontal), a yaw reaction of the rider is
> the
> result. And since the outer (other) leg isn't tied
> to the
> bike, the lower body of the rider (theoretically, if
> he
> would be able to keep so much strain on his leg
> muscles)
> would yaw outward of the turn. There's nothing
> really that
> can control the bike from his lower body in that
> position,
> so corrective knee pushing sounds very improbable to
> me.
> 
> Perhaps (and more logical I think) it's more like an
> "oh f###" moment with the rider realizing he's
> sitting
> more on his knee than on his saddle (because the
> bike is
> sliding outward), almost instantly followed by a
> regain
> of traction. This regain could be the result of the
> sudden
> outward shift of net center of mass, since the rider
> is
> basically ejected for a very brief moment. With
> traction
> in place the rider was placing the net CoM inward of
> the turn for ground play, with him sitting on his
> knee
> there's only the CoM of the bike left which is more
> outward of the turn, resulting in a sudden upright
> of
> the bike because of centrifugal force. That makes
> much
> more sense then the "pushing because he felt it
> sliding"
> theory, doesn't it?
> 
> I guess that stuff can be practiced with the rear
> wheel
> steering bike of the California Superbike School
> (which
> will be held in the Netherlands in July for the
> first
> time :-)).
> 
> Emile
> www.piloot.com
> 
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