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B Torsion, helicity of drive shaft, direction of energy-flow.

  1. Mar 19, 2016 #1
    The drive shaft of a truck undergoing acceleration twists a small amount. That twist defines a helicity. If you just know the rotation of a drive shaft you can not tell which way power flows but if given rotation and the twist of the shaft that can determine the direction of power flow?

    Thanks!
     
  2. jcsd
  3. Mar 19, 2016 #2

    A.T.

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    Yes.
     
  4. Mar 19, 2016 #3
    That is cool.

    Energy can flow in both directions of a trucks drive shaft but energy normally flows towards the wheels but when a truck uses its air-brakes (edit, or just lets off the gas) to slow down energy flows towards the engine?

    Edit, to recover energy from a car or truck energy must flow the other direction.

    Thanks!
     
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