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Re: Engineering 101 - Was:[ST] New Member



You are correct it is overly simplistic it was meant
to be. I'm an engineer and have found that most people
don't care to chat about vectors and drag coefficients
beyond which fairing or tires they should use for the
most speed. The original question was why do we
separate from the bike in a low side. I thought that
answered it simply. If you want to throw obstacles in
the path we may separate and reconnect with the bike
numerous times. And to properly analyze this situation
one would have to lay out the obstacles, bike
velocity....etc, and ye olde dynamics text book would
need to be dusted off. And my eyes glaze at this
thought.

I have found that the sooner you realize why the world
suddenly looks different and analyze the situation..ie
which way is the bike going vs which way do I want to
go. So you can make what ever small skid adjustment
you are able to do, to avoid the situation you
described, the better off you are.
 



- --- chuck boatwright <dirac@xxxxxxxxxxx> wrote:
> (sorry to revive a killed thread)....
> 
> Martin Waltman wrote:
> > The simplest experiment is to take a rock and a
> piece
> > of jello out to the pavement and see witch one
> slides
> > further the jello would represent the human body
> and
> > the rock the bike. 
> 
> Martin -- while this argument is valid in many
> circumstances, I think it
> is overly simplistic of real crash situations.   
> While the body slides 
> (whether race leathers, 'stich or flesh) slower than
> the bike on 
> pavement; once off pavement, the world turns a bit
> on the (was) rider.
> 
> Assume that you lowside a corner.  you and bike
> slide off tarmac (for
> simplicity we assume no curbing.  there's no such
> thing as "sliding"
> over curbing)  Bike slides way faster on pavement
> than rider.  once bike
> leaves pavement various "thingies," most often pegs
> or bars, auger in 
> quite nicely.  Suddenly rider's velocity is greater
> than bike's, and 
> bike's (negative) accelleration is greater than (ex)
> rider's..  here is 
> where rider (sliding on protective gear... we hope)
> hits bike.  OUCH. 
> been there.  done that.
> 
> I've had enough low sides to have mastered this
> process, and, if sharing 
> this can save some injuries, I think it justifies
> responding to this 
> thread.
> 
> If you find yourself in a fresh lowside, you most
> often are on the 
> ground sliding on one side.  Manipulate yourself
> such that you are 
> sliding on your back, feet first.  This way, if you
> do find yourself in 
> a situation of serious deccelleration or
> reconnecting with your (less 
> than perfect?) ride, you have some strong muscles
> and big bones ready to 
> handle it.
> 
> (cheezy, if not rickety, segue)
> 
> now, let me tell you about the _first_ time I broke
> my clavical....
> 
> 
> oh yeah..  the technique above is best done when
> wearing a back 
> protector.  Get one, not the crappy "back protector"
> that rider 
> warehouse sells for the 'stich (sorry andy g -- it
> really does _SUCK_ ) 
> Buy a real one like a bohn, dainese, helimot TLV
> etc.
> 
> Naturally all disclaimers apply..  I am not a dr,
> lawyer or indian 
> chief, but I play all three on the internet.
> 
> --chuck
> amatuer crasher and engineer
> 
> 
> 
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