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Conductivity of metals was: Re: propeller gap help (fwd)



---------- Forwarded message ----------
Date: Tue, 24 Jul 2007 09:37:01 -0400
From: Jason Johnson <jasonmsusolar@xxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Conductivity of metals was: Re: propeller gap help (fwd)

David,

I should have posted this link also, the first one I posted was just a misc.
materials table.

http://www.ndt-ed.org/GeneralResources/MaterialProperties/ET/et_matlprop_index.htm

Jason

On 7/24/07, Tesla list <tesla@xxxxxxxxxx> wrote:
>
>
> ---------- Forwarded message ----------
> Date: Tue, 24 Jul 2007 12:59:08 +0000
> From: David Rieben <drieben@xxxxxxxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Cc: drieben@xxxxxxxxxxx
> Subject: Re: propeller gap help (fwd)
>
> Hi,
>
> This is a pretty nice conductivity table, but I find it rather strange
> that they don't give any rating for aluminum or copper.?
>
> --
> David Rieben
>
> -------------- Original message --------------
> From: "Tesla list" <tesla@xxxxxxxxxx>
>
> >
> > ---------- Forwarded message ----------
> > Date: Mon, 23 Jul 2007 22:57:50 -0400
> > From: Jason Johnson
> > To: Tesla list
> > Subject: Re: propeller gap help (fwd)
> >
> > Scott,
> >
> > Good call on the conductivity. They are close though, at 28 and ~30
> percent
> > IACS (International Annealed Copper Standard). I ran across a useful
> table
> > for conductivities here:
> >
> >
> http://www.ndt-ed.org/GeneralResources/MaterialProperties/ET/ET_matlprop_Misc_Ma
> > tls.htm
> >
> > Jason
> >
> > On 7/21/07, Tesla list wrote:
> > >
> > >
> > > ---------- Forwarded message ----------
> > > Date: Sat, 21 Jul 2007 11:45:18 -0400
> > > From: Scott Bogard
> > > To: tesla@xxxxxxxxxx
> > > Subject: Re: propeller gap help (fwd)
> > >
> > > Jason,
> > > Brass does not conduct better than tungsten (sorry). I thought it
> > > did
> > > as well, but it does not, look it up. You are correct that the threads
> > > will
> > > give better cooling though. I you wanted super cooling, you might
> thread
> > > a
> > > few washers spaced with nuts to act as fins, but this may increase the
> > > weight and drag, making it impractical on all but a stronger motor.
> > > Tungsten will indeed last longer, But I never used it until I started
> > > using
> > > high current MOTs (I used steel before, which is not at all ideal, but
> it
> > > worked). Good luck Shaun.
> > > Scott Bogard.
> > >
> > >
> > >
> >
> >
>
>
>