Re: Head shake


Rick Cortese wrote:

Have you found time to watch Moto GP lately? I mention this since I know
they are using after market suspensions like Ohlins or otherwise best
money can buy. Serviced and gone over before every race by a
professional mechanic and ridden by the best riders in the world.

Ohlins shocks and forks have two compression damping circuits. One is
an adjustable needle and orifice to control damping at rather low
stroking speeds for control over larger bumps that occur at lower
frequency.

The other compression damping curcuit is a shim stack that blows off
excess pressure when the tire hits smaller bumps at higher frequencies.

The latest thing on Formula I cars is extrenally removable valving. You
get a box of about 16 preset chrome plated valves and they go into
holes in the shock absorber body. It's laying on its side, so it
doesn't leak oil. I don't know what they do about pressurization while
they are swapping valves.

They still get tank slappers and go over the bars.

When they get spit off to one side of the bike and still hang onto the
bars they are actually in a huge, out of control *speed weave*. The
chassis is rolling and yawing at the same time. When they lose control
and don't let go of the bars, the motorcycle trips over its own front
wheel, which is pointed sideways to the direction of travel.

Freddy Spencer likes to say that there is a lot of energy transferred,
as the rider is launched 10 or 15 feet into the air and flips with the
machine down the race track.

If the rider would just let go of the bars, the motorcycle would often
recover stability and go running down the track, riderless.

My favorite whipping boy is the way rake and trail are set up to make
steering self centering among other things. Cars do this too. Turning
right or left raises the vehicle so it tries to point the wheels
straight ahead to reach the most stable point. Problem is wheels
oscillate like a seesaw past the center point.

The older the tires are, the less damping you get from hysteresis in
the rubber.

That's when you need a velocity sensitive steering damper. That's
unlikely to be a solution for theOP and his elderly UJM.

The main thing HE needs to understand is how old, hard rubber loses its
grip and why he needs to lower the front end slightly to make his front
tire grip better.

.

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