REFLECTOR: The law of conservation energy.

Brainard, Jerry Jerry.Brainard at anthem.com
Tue Mar 18 15:18:56 CDT 2008


Thank you for the compliment. 


- jerry

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Andy Millin
Sent: Tuesday, March 18, 2008 3:33 PM
To: 'Velocity Aircraft Owners and Builders list'
Subject: Re: REFLECTOR: The law of conservation energy.

I was reading this and wondering what "Geek" would go into such detail.
Then I saw it was you.  :)

-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Brainard, Jerry
Sent: 03-18-2008 1:39
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: The law of conservation energy.

I think there another huge difference.  That's the stiffness of the
caliper assembly.  The mass of the rotor does not appear to be enough
different to account for the braking difference.  If it were just the
mass cooling of the rotor, it would be a brake fade problem.  That does
not appear to be the case.  The Matco's seem to be weak in initial and
extended braking.  As you pointed out Larry, the arm is not the
important difference, it should be the amount of the heat absorbed and
dissipated.  Of course all of that assume that you have correct pad
contact.  The Matco's do not appear to have sufficient strength across
the caliper.  The beautiful piston side looks plenty strong, but the
same cannot be said of the opposite side.  The bolts might be enough,
but the backing plate looks to light weight to stay in contact as
pressure increases.  That would lead to a hot spot on the inside edge
that would quickly lose braking effectiveness due to gasification of the
hot spot.  If you look at other braking systems, they have a more robust
caliper on both sides of the rotor and a very stiff junction between the
two side.  The objective is to keep both pads in even pressure on the
rotor.
Obviously, it would take a brake dyno and some creative testing to
confirm my hypothesis.
 
- jerry
 

________________________________

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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