REFLECTOR: The law of conservation energy.

[Joe Ewen]

But which costs more to replace - brake pads or tires?  Not to mention the built in rumble strips when a tire is flat spotted.
  ----- Original Message ----- 
  From: Brainard, Jerry 
  To: Velocity Aircraft Owners and Builders list 
  Sent: Tuesday, March 18, 2008 4:22 PM
  Subject: Re: REFLECTOR: The law of conservation energy.


  It the brakes were really effective, we would be able to transfer the heat to the big heat sink called the runway.  Lock up the brakes and the heat goes to interface between the tires and the runway.  There you go.  Lock the brakes and save the pads.

  - jerry




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  From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of Lawrence J. Epstein, MD
  Sent: Tuesday, March 18, 2008 2:15 PM
  To: 'Velocity Aircraft Owners and Builders list'
  Subject: Re: REFLECTOR: The law of conservation energy.


  As below, the "heat" generated is likely the same, although there may be some energy radiated as light, it is not likely significant and there is no change in other forms of energy (other than kinetic).  

  What is confusing people is that whereas the heat generated is the same, the peak temperature may be lower, by virtue of differences in specific heat of the materials, engineering of airflow, radiant and conductive cooling, etc......



  -----Original Message-----
  From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On Behalf Of Laurence Coen
  Sent: Tuesday, March 18, 2008 1:05 PM
  To: Velocity Aircraft Owners and Builders list
  Subject: REFLECTOR: The law of conservation energy.



  Any vehicle, (plane,train, auto) that uses friction breaks to stop converts kinetic energy, (speed x weight) to heat.  Therefore, Cleveland or Matco, the same plane at the same speed will make the same heat.  Why then do the Clevlands stop better than the Matco?  The Clevlands larger diameter disk provides greater braking torque for the same friction due to the longer moment arm but the increase in diameter also increases the surface speed at the same wheel rotational speed and therefore the same heat (no free lunch).  The larger disk has two things going for it.  A larger thermal mass to absorb heat and greater surface area to reject heat.



  Larry Coen

  N136LC

  SE/RG Franklin/IVO, Stops fine Matco


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