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Old 01-03-2013, 07:23 PM   #98
Jedl
Gnarly Adventurer
 
Joined: Jun 2010
Location: New England
Oddometer: 102
Quote:
Originally Posted by Racer111v View Post
Lots of turning with out counter steering......yes I know this is impossible.
Let's try this another way, . . . have you ever tried to balance a broom upside down with your hand? You know when the broom sweeper is pointing to the sky and the end of the broom handle is in your open, upward-facing palm?

That's called an inverted pendulum. In order to keep the broom standing up (balanced), you have to keep moving your hand (the end of the broom handle) such that the broom keeps trying to fall in the direction you want it to fall. If it starts to fall too far to the left, you quickly move your hand to the left faster than the COG of the broom is moving left. Done correctly, you'll pass the COG and the broom will start to fall to the right. At which point you'll move you hand quickly to the right (past the COG) to stop the broom from falling to the right.

This is exactly how we balance a bike, any type of bike. Do you see how these things, the balanced broom and balanced bike are both inverted pendulums? Now replace your palm with the bike's contact patches. We have to move the contact patches further out than the COG to stop the fall. At which point the bike starts to fall in the other direction and we again have to move the contact patches further out than the COG to stop that fall. I hope you can see the analogy.

cheers,

Additional thoughts:

As we ride, at some point the bike will start to fall to the left (meaning the COG is to the left of the line between the contact patches), in order to stop the fall we over-steer to the left until the line between the contact patches is to the left of the COG (stopping the fall to the left and likely starting a fall to the right). Since the COG is now to the right of the contact patches, the bike starts to fall to the right. In order to stop the fall to the right we have to over-steer the contact patches past the COG, . . when the bike starts to fall left again.

Can you do a track stand on your trials bike? A track stand is where you are on a small incline and the front wheel is turned sharply to one side (let's say left for this example)?

If you start to lose balance towards the left (falling leftward), all you have to do is move forward slightly to regain balance. If you start to lose balance rightward (falling rightward), all you have to do is roll backwards slightly to regain balance. Because the front wheel is turned sharply to the left - moving forward moves the contact patches to the left of the COG. And moving backwards moves the contact patches to the right of the COG. There's no additional movement of the handlebar, but you are still steering the contact patches from one side of the COG to another. And that's the definition of counter-steering.

Jedl screwed with this post 01-03-2013 at 07:45 PM
Jedl is offline   Reply With Quote