REFLECTOR: The law of conservation energy.

[Scott Derrick]

nice discourse, but its all supposition.

As I said my Matco's have 450 hours of operation and they have performed 
fine.  Never any fade, though I do use them in a manner as I was trained 
to do as a truck driver years ago.  Maybe its all operator technique?

The Cleveland's may have more squeezing power which would require less 
foot pressure to get the same result from a Matco I don't know.  I do 
know geometry installation of the master cylinder is critical and maybe 
the Cleveland's allow for more misalignment in that installation?

A larger disk would certainly allow for more energy absorption.  Is the 
Cleveland disk bigger? Mass wise that is?

I switched to Cleveland's on my Bonanza which was a huge improvement, 
but  the old beech brakes were really worthless.

The real question is, do the Cleveland's have a higher kinetic energy 
rating than the Matco's?

Scott


> 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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