Re: Al Rotors - The definitive answer (Looong)

[Robert Myers <rmyers@wvit.wvnet.edu>]

Dan,

A given amount of energy dissipated in the Al will cause a greater 
temperature (due to the lower specific heat) rise in the Al and therefore a 
greater Delta T between the Al and the air than in the case of a 
comparable iron rotor.  This will result in a faster dissipation of heat to 
the air by the Al rotor.

Likewise, because Al is a better conductor, Delta T *within* the rotor will 
be smaller, tending to keep the Al surface hotter for even better heat 
transfer to air.

Darn.  I swore when this thread got started I'd stay out of it.  Oh well...

On Wed, 14 Feb 1996, Dan Masi wrote:

> On Feb 14,  3:06am, Jeremy R King wrote:
> > Subject: Re: Al Rotors - The definitive answer (Looong)
> > On Tue, 13 Feb 1996, Richard Funnell wrote:
> 
> > > >BECAUSE Aluminum also
> > > >dissipates heat to air a lot better than iron.
> > > 
> > > Really?
> > 
> > Yep.  
> 
> Nope.
> 
> Aluminum *conducts* heat better than iron.  Aluminum has a
> lower *specific heat*, so it doesn't *store* as much heat energy
> as does iron.  But dissipation rates are entirely a function of
> geometry and temperature difference.
> 
> Dan Masi
> 
> 


__
  Bob
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