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roadman

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Posts posted by roadman

  2. Lean Angle == Turn Radius?

    in Cornering and Techniques

    Posted

    I am still interested in the gyroscopic forces and there is still significant disagreement between scientists of note just how much gyro forces contribute to the motorcycle. I think that the experiments with bicycles have limited value considering how much heavier motorcycle wheels are, especially when combined with the significantly higher speeds that are typical of the motorcycle in general.

     

    Any thoughts about this idea?

     

    I'm not a scientist. And, I admit I do not understand all I know about bikes or gyroscopes.

    Yes, there is significant disagreement between scientists about precession from what I have read. My friend who is both an experienced motorcyclist and aeronautical engineer and physicist assures me it is only marginally relevant. (He also dismisses Bernoulli’s Principle as having little to do with flight.) :)

     

    Also, motorcyclists disagree about the relevance of precession in motorcycle steering (often vehemently).

     

    To my mind, precession provides a good description of what is happening while riding a motorcycle. That is a force operates 90 degrees in the direction of rotation. In the absence of an outside force another gyroscopic property controls the bike. That is rigidity in space. Of course, when this rigidity is lost, a gyroscope tumbles, i.e., the bike crashes.

     

    But, with regard to the difference between the experiment with a bicycle wheel and a motorcycle in operation I think the higher speed and mass would make precession more forceful in a motorcycle.

     

    It seems to me the experiment with a bicycle wheel using handle grips attached to the axle is only half the turn input. That replicates the push on the handlebar. That gets lean.

     

    The other half is the resulting diagonal force applied by the road to the contact patch - that gets the turn.

     

    The force seems to be there, however we may interpret it.

     

    Just some thoughts.

  3. Slow In Fast Out?

    in Cornering and Techniques

    Posted

    Now THAT'S more like it!

     

    Thanks for that, Roadman.

     

    Barber labels these turns 14 and 14a.

     

    So... no downshift for 14a as it is labeled by Barber. I can't see if he is dragging the brake at all but he rolls out on the hill well before the entry to 14a. It looks like Skip runs it a bit deeper. Still couldn't see his brake lever. I think if it were me I would be doing some braking while leaned over there and then leaning in more for the tighter part of the turn.

     

    Oops! Right, 14 and 14a.

     

    I'm not sure how Dave is geared.

  5. Hello From An Old Rider New To Sportbikes

    in School Questions/General Discussion

    Posted

    Hello! I will introduce myself.

    I'm an old street rider, started in 1955 - scooters, cruisers, sport touring - but new to modern sportbikes.

    I now ride a 2006 GSX-R 750 which is having it's first birthday this week with 8,808 miles showing on the odo now.

    I've done 9 track days this summer - 835 track miles. Wow! What a thrill.

    I actually did a CSS School in the mid-1980's which was held at Roebling Road, Ga. on Kawasaki 500 twins. I rode a Honda VFR 500 at the time.

    I remember I was timid, doubtful, and slow.

    I'm now learning that I don't really know very much about riding a motorcycle.

    So I'm paying attention to control riders suggestions and keeping an open mind.

    And, I'm reading in this forum.

    Comment and advice will be welcome.

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