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<channel>
<title>The Geekess   </title>
<link>http://sarah.thesharps.us</link>
<description>Linux, bicycling, open source, gardening, amateur rockets, and other seemingly unrelated hobbies.</description>
<language>en</language>
<item>
  <title>PSAS Meeting: Airframe bits!</title>
  <link>http://sarah.thesharps.us/2008-06-18-19-20.html</link>
  <description><![CDATA[
<p>The <a href="http://psas.pdx.edu">Portland State Aerospace Society</a> (PSAS)
builds, designs, and launches open source amateur rockets.  If you haven't heard
about PSAS before, watch my five minute <a
href="http://www.youtube.com/watch?v=nYLIYab6-OY">Ignite Portland 2 talk</a> and
<a href="http://psas.pdx.edu/~sarah/ignite-portland2-pres.pdf">follow along with
the sides</a>.</p>

<p>Dan showed off the start of the nosecone mold today.</p>

<p><center>
<a href="http://picasaweb.google.com/saharabeara/Psas/photo#5218501470236919858"><img src="http://lh3.ggpht.com/saharabeara/SGvXcDlTSDI/AAAAAAAAAmI/HgPXWA3ITUc/s400/06182008%28001%29.jpg" /></a>
</center></p>

<p>(Note that's Ian Osgood behind the mold, not Dan.)</p>

<p></p>

<p>Dan had some issues with the mold coming off the wooden plug.  He put wax on the
wooden plug, but the mold didn't come off very well and there were some wood
chunks embedded in the fiberglass mold.  He also had some problems with air
bubbles on the edges, which will cause imperfections in anything made in the
mold.</p>

<p><center>
<a href="http://picasaweb.google.com/saharabeara/Psas/photo#5218509225070368626"><img src="http://lh4.ggpht.com/saharabeara/SGvefclrF3I/AAAAAAAAAmU/iTmr9sThzl4/s400/06182008%28004%29.jpg" /></a>
</center></p>

<p>Dan is trying to avoid vacuum bagging it for some reason.  He's going to coat
the plug with <a href="http://en.wikipedia.org/wiki/Polyvinyl_alcohol">Polyvinyl
alcohol (PVA)</a> next.  That should make the mold slide off the wooden plug
better.</p>

<p>Eh, it's all above my head.  Ask the airframe team on their <a
href="http://lists.psas.pdx.edu/mailman/listinfo/psas-airframe">mailing list</a>
if you have any questions.</p>

<p>Eric from the airframe team is starting at <a
href="http://www.insitu.com/">Insitu</a>, which everyone things is cool
(although the military aspect is not so cool).</p>

]]></description>
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