Re: [ST] for Marc -

[Ken Nisula <knisula@xxxxxxxxx>]

Actually, the downward force of the bike to the ground
will be less on a low side than if the bike tipped
over standing still.  Remember on a low side you are
already leaned over at 50 degrees or so, thus the
distance from the slidder to the ground is less.  The
problems arrise from the bike sliding .... then you
have more extreme forces being transmitted into the
bike that are not absorbed by the shocks and tires,
but rather through the sliders into the frame.  Worse
yet is if the bike starts to tumble side over side ...
then nothing is going to protect it.

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

> Your analogy is tragically flawed...
>  
> regardless of the forward motion, on object will
> accelerate towards the ground at the same rate under
> the pull of gravity (unless it has wings or
> something something creating lift from a forward
> motion...).  So the force when hitting the ground
> will be identical whether moving forward or not. 
> Your analogy ends up with two very different impact
> speeds (falling from standing and falling from your
> roof do not have the same acceleration distances -
> the object falling from the roof will have more
> distance to accelerate and thus be moving faster
> (normal to the ground) and thus have a greater
> normal force impact with the ground.  To make the
> analogy you need to be running and fall to the
> ground, or just standing and fall to the ground.  In
> that case, the impact is the same.
>  
> Matt Heyer
> 
> 
> ----- Original Message ----
> From: donnydogood <donalddraper@xxxxxxxxxxx>
> To: st@xxxxxxxxxxxxxxxxxxxx
> Sent: Monday, June 5, 2006 1:59:11 PM
> Subject: [ST] for Marc -
> 
> 
> >>> I've been told by more than one person that
> sliders can do more harm than good in a big off. <<<
> 
>     Actually, the worst damage done by frame sliders
> is usually in a tip over of a stationary bike, due
> to the angle of the impact and the full weight of
> the bike landing on the slider.  The greater the
> speed, the more of a glancing blow the slider
> receives.  To demonstrate this for yourself, don
> your protective gear and run as fast as you can
> through the house and out the front door, jumping
> over the steps, landing on the sidewalk and sliding
> to a stop.  Note the sensations, including pain, you
> experience.  Now climb up on your roof and jump off,
> falling straight down to the pavement.  Feel the
> difference?
> 
>                                       dowgydoodoo   
>         - - - - o&\o 
> 
> 
> 
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