Saturday, February 04, 2006

I saw "Worlds fastest indian" with Anthony Hopkins at the Camelview Harkins. I really enjoyed the film and understand why critics are dogging this film. It is a very passionate view of one very eccentric motorcyclist. You have to love motorcycles or be passionate to arrive at a place of comfort with the concepts provided by the film. For example. In motorcycling the tires are rounded for a reason. To turn the bike extra camber is used to manipulate the spinning gyro affect of the tires. centrifical force of the spinning tires draws a imaginary line of force. Physics dictates that this force holds the bike up right. The driver may feel tempted to "let" the bike row back and forth across the road. My dad explained this as "letting the bike drive" and frowned on such behavior. The positive caster of the front forks and the drag of the weight of front tire pushes the steering input out of line and the spinning front tire pulles it back straight only for the process to repeat as the steering angle is pushed in the other direction. Back to rounded tread of a motorcycle tire. Because the bike is a rolling gyro (hey remember how difficult starting and stopping were when you learned to ride a bicycle, the same gyro I am talking about made riding easy, but starting with out it difficult.) to get the bike to turn you have to move this imaginary line or centrifugal force. The forks are angled out and the tires round to bend the bike over in the turns. Because the tires are round for this purpose, there is very little tire touching the ground and you can only use so much of it. Turning takes force applied to the side of the tread where traction is most limited. Braking when the bike is upright is quickest, because no traction is used for turning. Turning and stopping at the same time is the best way to loose traction(bad) . Keith Code made use of an interesting way to control this. Picture an inverted pendulum with an arrow facing down on the bottom towards an arched real number line -10..0...10. As you turn this pedulum swings with the bike and the numbers the arrows
0..10...0 below them

point to steering percentage and below braking percentage. the ratio of steering to braking is related. It's possible either steer or stop, but becareful when doing both. This is the lesson I learned from the movie, my motorcyle and life in general. In life is only have so much time. No one can do everything they want to do and too much time spent in any one area, might be a waste of the most valuable resource. I wish I had the gift of communication to fully describe how close the relationship is between turning and/or stopping with limited traction is. Time is not a variable, I dare not treat it as such.-Evan the question is am I living my life, or wasting my time?

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