Posted by: JJA () on Wed May 12 10:40:26 2004

>>> In summary, Dr. Adair's model remains unrefuted. If additional material surfaces, I will be happy to review it. Until it does, Jack's hypothesis remains just that, an unproven theory.
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> JJA <<<
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> Hi JJA
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> Adair states in his in his book, that in order to develop energy for the swing, the body’s center of mass MUST move forward 12 to 18 inches at 6 to 8 mph DURING the swing.
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> Adair quote – “And any batter who would use your “stationary axis ” model, taken literally, could not hit a ball past second base.”
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> In other words, a Ph. D. Electrical Engineering, University of California, Berkeley -- Senior Engineering Fellow, major aerospace firm -- Several patents and papers in the area of dynamics and controls, has studied Adair’s model and video clips of hitters and concludes that Adair is right. -- Batters DO NOT rotate around a stationary axis – Batters DO move the center of mass forward 12 to 18 inches at 6 to 8 mph DURING the swing.
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> You stated “In lieu of any additional data forthcoming, this is my last post on the subject.” – I will hold you to your word. I am offering no additional data, the above was reported to you earlier.
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> I am willing to let the readers judge your creditability.
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> Jack Mankin
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>

Jack,

As I said before, I am making only a narrow interpretation here. You maintain torque applied to the bat by the hands is the primary means from which bat speed is generated, whereas Dr. Adair maintains that it is the whip effect. You have provided no compelling evidence that significant torque is applied to the bat handle during a swing. Unless you provide additional information, Dr. Adair's model of bat speed generated by the whip effect stands unrefuted by your arguments.

You have, unfortunately, extrapolated my argument to his contention that rotation about a stationary axis is impossible. Nowhere in my thread have I addressed this issue. It is a complicated enough issue that it would require a separate thread. I do believe, however, that you raise valid points on that issue that put his conclusions seriously in doubt.

To fully clarify my position, I simply state that Dr. Adair's model that little torque is supplied by the hands to the bat stands unrefuted by your arguments.

-JJA