<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<p>Do you want answers (or attempts at answers) on the list or
direct to you?</p>
<p><br>
</p>
<p>-Zach, KJ4QLP<br>
</p>
<pre class="moz-signature" cols="72">Research Associate
Aerospace Systems Lab
Ted & Karyn Hume Center for National Security & Technology
Virginia Polytechnic Institute & State University
Work Phone: 540-231-4174
Cell Phone: 540-808-6305</pre>
<div class="moz-cite-prefix">On 6/8/2018 10:36 PM, Michelle Thompson
via Ground-Station wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CACvjz2X+PwpVhennUPutv_s0MqJqDNESQq7qar52yCoHgZaEzA@mail.gmail.com">
<div dir="ltr">
<div>
<div class="gmail_signature">
<div dir="ltr">
<div>
<div dir="ltr">
<div>
<div dir="ltr">
<div dir="ltr">
<div>
<div>Phil Karn KA9Q has been working on
something fun for us. If you enjoy this
quiz, please feel free to share it and let
him know!</div>
<div><br>
</div>
<div>Given the documents that you can find at:
<a
href="https://github.com/phase4space/AO-10-blueprints"
moz-do-not-send="true">https://github.com/phase4space/AO-10-blueprints</a></div>
<div><br>
</div>
<div>Quiz for fans of the AMSAT Phase
IIIB/AO-10 blueprints</div>
<div>Phil Karn, KA9Q</div>
<div><br>
</div>
<div>Question 1: AO-10 carried a 400-newton
kick (rocket) motor that used hypergolic
propellants. It was fired only once, but the
burn duration was 1.68 times longer than
planned. Why? (Note: the burn did *not* end
because of propellant depletion.)</div>
<div><br>
</div>
<div>The cause can be discerned from the
prints; i.e., it was a hardware problem, not
a software bug or operational mistake.</div>
<div><br>
</div>
<div>Optional hint 1: The burn was timed in
hardware.</div>
<div><br>
</div>
<div>Question 2: The ground test of the
hardware consisted of successfully executing
a maximal length burn. What tests could have
revealed it?</div>
<div><br>
</div>
<div>Question 3: Although the first burn did
not deplete the propellants, it was not
possible to fire the engine again because of
insufficient helium pressure. Why? (Hint:
the cause was not insufficient helium
loading before launch.)</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<!--'"--><br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
Ground-Station mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Ground-Station@lists.openresearch.institute">Ground-Station@lists.openresearch.institute</a>
<a class="moz-txt-link-freetext" href="http://lists.openresearch.institute/mailman/listinfo/ground-station">http://lists.openresearch.institute/mailman/listinfo/ground-station</a>
</pre>
</blockquote>
<br>
</body>
</html>