Posted by Bram Stolk on August 15, 2006, 9:14 am
The wheelie argument sounds plausible.
I came up with another:
For Pedrosa, the unsprung-weight is relatively higher.
This means his wheels have more difficulty following the
bumps in the road. The chassis+rider will shake more.
The same can be seen in car vs bus: The bus has a very
low (relatively speaking) unsprung weight... the wheels
follow the ground perfectly, giving the chassis a smooth
ride.
More info here:
http://en.wikipedia.org/wiki/Unsprung_weight
Bram
Posted by Mark N on August 15, 2006, 9:45 am
Bram Stolk wrote:
> For Pedrosa, the unsprung-weight is relatively higher.
Why is that?
Posted by Bram Stolk on August 15, 2006, 10:59 am
Mark N wrote:
> Bram Stolk wrote:
>
>> For Pedrosa, the unsprung-weight is relatively higher.
>
>
> Why is that?
MASS_wheel / (MASS_pedrosa + MASS_honda) >
MASS_wheel / (MASS_hayden + MASS_honda)
They have the same wheels, same diskbrakes, etc, so
the absolute unsprung weight is the same.
But the sprung weight is higher for Hayden.
Another way to look at it:
If the wheels bounce, a heavier bike+rider will
be influenced less than a light bike+rider.
Or: it takes less energy to shake Pedrosa up and
down, than it takes to shake Hayden up and down.
But as said earlier: all drawbacks are more than
compensated for, because of the faster acceleration
and deceleration for Pedrosa.
Bram
PS: Things that contribute to unsprung weight
(MASS_WHEEL in my equation) include wheel,
tyre, brakes, part of shockabsorber.
Posted by Julian Bond on August 15, 2006, 12:22 pm
>But as said earlier: all drawbacks are more than
>compensated for, because of the faster acceleration
>and deceleration for Pedrosa.
The riders move a lot forward and back to counteract the tendency to
wheelie and stoppie. Pedrosa's lower weight means he has less influence
on this. Which *might* explain why he finds it hard to out-brake people.
But then Hayden seems to like to brake with the back wheel in the air
and slewing sideways.
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Posted by Brutus on August 15, 2006, 1:29 pm
> >But as said earlier: all drawbacks are more than
> >compensated for, because of the faster acceleration
> >and deceleration for Pedrosa.
> The riders move a lot forward and back to counteract the tendency to
> wheelie and stoppie. Pedrosa's lower weight means he has less influence
> on this. Which *might* explain why he finds it hard to out-brake people.
> But then Hayden seems to like to brake with the back wheel in the air
> and slewing sideways.
Everyone(in this tread) so far is negating the possible effects of
traction/launch control on the
MGP bikes. I'm not to sure how this would effect the issue of lifting the front
wheel while
accelerating out of a corner, BUT having less mass to accelerate would still be
a greater
advantage. Ask any drag racer.
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