Precisely!
It's really quite simple. Going airborne off an incline, applying
the brakes to the rear wheel causes the bike to rotate forward
slightly, keeping you from landing with the front wheel way too
far up in the air. If you need to readjust your angle as you come
down, just blipping the throttle a little, causing the rear wheel
to quickly rotate again, will bring the front end back up. This,
of course, can all be augmented by appropriate body english.
Been there, done that, but not in this sort of venue -- just a few
thousand miles acting crazy on dirt bikes. Got the scars to prove
it.
Walt
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A human being has a natural desire to have more of a good thing
than he needs. -- Mark Twain (defining the cause of Zuikoholism a
century ago)
---------- Original Message ----------------------------------
From: "Dick Lague" <rlague@xxxxxxxxxxx>
Reply-To: olympus@xxxxxxxxxx
Date: Wed, 25 Feb 2004 08:56:09 -0800
>
>I not an arena cross racer, but I have done enough riding to know
>a few things.
>
>1. you "drive" a car and you "ride" a motorcycle.
>2. whether the rear wheel is spinning or not isn't important. The
>important thing is that you are back on the gas when you hit the
>ground. You don't want the contact with the ground for the rear
>wheel to happen when the wheel is stopped. The engine braking
>will slam the front end down. You want a bit of front end high
>attitude.
>
>If you had the back brake on, the whole suspension would bottom
>out and your would be in big trouble.
>
>3. stopping the rear wheel will give you some nose down attitude,
>but you want to get the front end back up with a bit of throttle.
>
>How do I know......well In addition to being dirt rider and an OM
>nut, I have worked in the motorcycle business for 30 years and
>founded magazine titles such as DIRT RIDER, MX RACER.
>
>DICK
>
>
>-----Original Message-----
>From: olympus-owner@xxxxxxxxxx [mailto:olympus-owner@xxxxxxxxxx]
On
>Behalf Of Mark Marr-Lyon
>Sent: Wednesday, February 25, 2004 6:45 AM
>To: olympus@xxxxxxxxxx
>Subject: [OM] Re: First Arenacross shoot-Holy Smokes!
>
>
>The drivers probably do it on purpose in order to get the bike's
front
>wheel pointed at the ground while in the air.
>
><begin physics teacher mode>
>While in the air, there are no external torques acting on the
>bike/rider system, so angular momentum is constant. The three
main
>sources of angular momentum will be the two wheels and the
rotation of
>the bike and rider. The rotation of the engine crankshaft and
flywheel
>would also contribute, but probably be smaller since they don't
have as
>much moment of inertia as the wheels or bike. By applying the
brake to
>one (or both) of the wheels, the angular momentum will be
transferred
>to the bike and rider, and the rotation rate of the bike is
increased
>and in the same direction as the wheels were spinning.
Conversely, if
>the throttle is opened and the rear wheel is accelerated, the
bike will
>start to rotate in the opposite direction.
><end physics teacher mode>
>
>I don't really know why they preferentially stop the back wheel,
but I
>could imagine that it has something to do with what would happen
if
>they hit the ground with the brake still on. With the back brake
on,
>the back wheel will just skid along until they release the brake,
but
>with the front brake on, they'd probably flip over.
>
>Having never actually done this (and never really wanting do),
this is
>all just speculation and I'd be interested in hearing what the
drivers
>would have to say about it.
>
>Mark
>
>On Feb 24, 2004, at 10:35 PM, Stephen Scharf wrote:
>>> Nice Shot! What is curious though is the apparent motion of
the front
>
>>> wheel
>>> and the lack of motion on the rear.
>>>
>>> Gord
>>
>> Yes, I wondered that too, because I have a no. of shots that
show
>> that effect, the only thing I can think of is that the rear is
>> stopped from engine braking, being connected to the engine by
the
>> chain, whereas the front is free to spin or freewheel.
>> -Stephen.
>
>
>The olympus mailinglist olympus@xxxxxxxxxx
>To unsubscribe: mailto:olympus-request@xxxxxxxxxx?
subject=unsubscribe
>
>To contact the list admins:
>mailto:olympusadmins@xxxxxxxxxx?subject="Olympus List Problem"
>
>
>
>The olympus mailinglist olympus@xxxxxxxxxx
>To unsubscribe: mailto:olympus-request@xxxxxxxxxx?
subject=unsubscribe
>
>To contact the list admins: mailto:olympusadmins@xxxxxxxxxx?
subject="Olympus List Problem"
>
The olympus mailinglist olympus@xxxxxxxxxx
To unsubscribe: mailto:olympus-request@xxxxxxxxxx?subject=unsubscribe
To contact the list admins: mailto:olympusadmins@xxxxxxxxxx?subject="Olympus
List Problem"
|