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Re: propeller gap help (fwd)

---------- Forwarded message ----------
Date: Mon, 23 Jul 2007 22:57:50 -0400
From: Jason Johnson <jasonmsusolar@xxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: propeller gap help (fwd)


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:



On 7/21/07, Tesla list <tesla@xxxxxxxxxx> wrote:
> ---------- Forwarded message ----------
> Date: Sat, 21 Jul 2007 11:45:18 -0400
> From: Scott Bogard <teslas-intern@xxxxxxxxxxx>
> 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.