[Space] Minutes 3/9/09

Christie Dudley longobord at gmail.com
Wed Mar 10 20:07:12 PST 2010


While antifreeze sounds like a neat idea, vaporization is not the problem so
much as pressure/thinned atmosphere.  Think pv=nrt sort of deal, keeping in
mind those phase charts from chemistry.

Christie
_______
"We also briefly discussed having officers replaced by very small shell
scripts." -- Noisebridge meeting notes 2008-06-17

The outer bounds is only the beginning.
http://www.flickr.com/photos/genriel/sets/72157623376093724/


On Wed, Mar 10, 2010 at 7:57 PM, Albert Alexander <
albert.alexander at gmail.com> wrote:

> Dear mod(s): Please disregard prev. email, accidentally sent as non-member.
>
> Here's what we did and thought about on Tuesday.
>
>
> THE FIGHT AGAINST CONDENSATION
>
> The internals of the payload will be contained in a mylar envelope. This
> will provide a continuous thermal space that retains a LOT of heat (space
> blankets claim something like 90%). I'm still investigating the energy
> required to keep this space above dew point. That would prevent condensation
> (hopefully).
>
> Still working on whether we should add a battery dedicated to warming. I'd
> much rather tap a camera or radio battery to avoid the extra mass. On first
> glance the radio battery looks like a prime candidate (low drain long life)
> and is least likely to automatically shut off if it gets hot.
>
> Indium Tin Oxide film (ITO) is enroute courtesy of Bayview Optics. This
> will heat the lenses with a thermistor circuit. There is a cup in my freezer
> with antifreeze on it to test evaporation rate; this could be an acceptable
> passive substitute for lens heaters depending on the distortion (its kinda
> viscous).
>
> Camera circuits will be sealed with a conformal coating. Silicone looks
> ideal. Hopefully will have some by Sunday for further testing.
>
>
> THE PAYLOAD
>
> Styrofoam was cut and beveled with the classy new wire cutter. A camera
> port has been added. The payload looks fairly anthropomorphic now. It needs
> a name.
>
>
> COMLINK
>
> Antenna was bound to carbon rods with thread.
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>
>
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