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Old 03-13-2008, 05:18 PM   #67
Dave
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Join Date: Feb 2008
Location: Cherry Hill NJ
Moto: GV1200 Madura, Hawk gt
Posts: 13,992
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Quote:
Originally Posted by ceo012384 View Post
Funny, I've had so many girls say this to me.

Man, if you're going to speak in such a haughty fashion, you should at least be right. You're not. This post is ridden with inaccuracies.

Have YOU done any reading on motorcycle physics?

- The contact patch doesn't get much smaller when the bike is leaned over with the profile of today's tires... the traction is not decreased.

- Contact patch size depends on tire profile, lean angle, and how hard you are on the gas. And with today's tire profiles, at full lean there is still a very large contact patch.

- The reason turns are a problem is because the centripetal forces of cornering are trying to 'shear' the tire. When accelerating in a straight line, the forces of acceleration as well as gravity squat the tire onto the ground and there is TONS of friction. When in a turn you just have gravity and a very slight acceleration, and then the cornering forces are ripping at the tire in a sideways fashion. I.e. in layman's terms, you're close to sliding. Think about it, if a carboard box were coming toward you on the ground, would it be easier to stop it by pushing against it, or by moving out of the way and pushing against the side of the box to try to stop is via friction between your hands and the surface?

- In racing, how are they only using a 'portion of the contact patch'? The contact patch is the portion of the tire in contact with the ground. They're using 100% of it. This is true for normal riding too, not just racing.

- In a car, you don't have more contact patch because the tires are turned. You have more contact patch because the tires are wider and they are flat, and the cornering forces act to load those tires far more in the vertical direction than with a motorcycle, yielding large rectangular contact patches.

Hope this clears things up.
man look what i started, thanks to ceo
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