Sender: <marv@lancaironline.net> (Marvin Kaye)
To: lml@lancaironline.net
Date: Fri, 14 Nov 2003 12:42:34 -0500
Message-ID: <redirect-2731823@logan.com>
From: "JJ JOHNSON" <JJJOHNSON@ACCESSCOMM.CA>
References: <list-2731763@logan.com>
Subject: Re: [LML] kinetic energy
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  Gary Casey wrote:

Snip..

 I don't know what a brake rotor weighs, but I'll guess 5
> pounds.  One thing I couldn't find is the specific heat of cast iron, but
> most steel alloys have a specific heat of between 0.1 and 0.14, so I'll
pick
> 0.12.  The temperature rise during a braking event is then
BTU/(sp.ht.Xlbm),
> or about 1,000 degrees F.  The brake temperature at the beginning could be
> 100, but if you drag the brakes a lot during taxi, heating them up to
maybe
> 500 and then do a rejected takeoff, you could see 1500 degrees.


Gary
    Question for you. Is this Calculated w/ 2 disks or just one? I couldn't
follow all your math[Its way beyond me] but it would seem that the kinetic
energy of the a/c is absorbed by two rotors so does this mean that there is
infact 1/2 the energy stated?  Or did I just miss that fact that you had
included that two disks [ Wouldn't be the first time I missed something!].
I'm not building a IV but I'm curiously following this discusion and
couldn't help asking.

Jarrett
235/32- 55%