Posted by: mb () on Fri Nov 26 17:40:33 2004

>>> The point is the hands do not torque the bat. <<<
> > >
> > > Hi mb
> > >
> > > Torque is also defined as “forces from opposing directions that cause an object to rotate about an axis.” – What are you thoughts on the post below from the Archives?
> > >
> > >
> > >
> > > Re: Torque
> > > Posted by: Jack Mankin (mrbatspeed@aol.com on Sat Oct 4 19:48:48 2003
> > >
> > > >>> Hi Jack
> > > Could you please explain how you came up with the 50/50 RE/torque scenario. Without being too scientific, what methods did you use? In a two handed situation, not one. <<<
> > >
> > > Hi Enloe
> > >
> > > There are two main forces acting on the bat to generate bat speed, torque and the transfer of the body’s rotational energy via a circular path of the hands. In order to isolate the bat speed developed from the CHP (Circular Hand Path) we added a steering-wheel knob to a 34-inch, 33 Oz. bat. Torque requires two forces being applied from opposing directions. The steering-wheel knob applies a single force at a single point on the bat. Therefore, all bat speed attained came from the CHP alone.
> > >
> > > With the rotational swing, the hands travel around 22 to 24 inches from launch to contact. Following that hand-path with both hands on the steering-wheel knob we were able to attain bat speeds of 50 to 55 mph. (Note: Higher speeds were attained with one hand which allows a much longer CHP.)
> > >
> > > We then isolated the torque factor by eliminating energy transferred by the CHP. This required holding the right hand at a fixed point and only applying torque to accelerate the bat-head. While the right hand was held at a fixed point, the bottom-hand rotated forward cocking the bat back about 90 degrees from contact (a heavy bag). Bottom-hand-torque (BHT) was applied as the lead-shoulder rotated back to the 105-degree position. This also produced speeds of 50 to 55 mph with no forward movement of the hands.
> > >
> > > We concluded that with good rotational mechanics, about 50% of the bat speed came from the CHP and 50% came from torque. Pressure sensors placed on the handle of the bat support that conclusion. --- The 50/50 ratio does not hold true with more linear mechanics where as little as 10 to 15 mph is gained from the longer but straighter hand-path.
> > >
> > > Jack Mankin
> > ****************************************************************
> > "Bathead power is directly porportional to its Kinetic energy which is expressed as "one half the mass multiplied by the square of the velocity (1/2MV2). Bathead velocity is developed by Thrust which is the Acceleration Force and Thrust, herein is normally constant regardless of velocity it has produced. This Thrust may be muscular force and or Centrifugal force." The hands are strong adjustable clamps attaching the bat to the arms for control of the bat. By themselvs they can only drive the ball a relatively short distance.
> >
> I dont see what this clamp stuff has to do with anything.It is the torque element that generates the batspeed. Am I missing something?
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Wouldn't "top hand wrist throw" be a more appropriate description than THT?