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            <title>Mission elapsed time at brennschluss: 30s. Close enough, considering ISP...</title>
            <link>https://www.23hq.com/Corax/photo/8132073</link>
            <description>&lt;p&gt;&lt;a href="https://www.23hq.com/Corax/photo/8132073"&gt;&lt;img src="https://www.23hq.com/7828204/8132073_1ff908258de6c13ba17a872f0fbc9f34_standard.jpg" width="460" height="288" class="23-standard"/&gt;&lt;/a&gt;&lt;/p&gt;&lt;p&gt;Mission elapsed time at brennschluss: 30s. Close enough, considering ISP varies with atmospheric pressure (i.e. altitude), and the inaccuracy of the mission timer.&lt;/p&gt;&lt;p&gt;Photo by &lt;a href="https://www.23hq.com/Corax/"&gt;Corax&lt;/a&gt;&lt;/p&gt;</description>
            <guid>https://www.23hq.com/Corax/photo/8132073</guid>
            <pubDate>Fri, 31 Aug 2012 10:16:22 GMT</pubDate>
            <media:content url="https://www.23hq.com/7828204/8132073_1ff908258de6c13ba17a872f0fbc9f34_large.jpg" width="756" height="473"/>
            <media:thumbnail url="https://www.23hq.com/7828204/8132073_1ff908258de6c13ba17a872f0fbc9f34_quad100.jpg" width="100" height="100"/>
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        </item>
        <item>
            <title>If you do the calculation with the Isp at sea level, you get...</title>
            <link>https://www.23hq.com/Corax/photo/8132070</link>
            <description>&lt;p&gt;&lt;a href="https://www.23hq.com/Corax/photo/8132070"&gt;&lt;img src="https://www.23hq.com/7828204/8132070_c38fe6f4c483582bec4d6c20a6b0743c_standard.jpg" width="460" height="288" class="23-standard"/&gt;&lt;/a&gt;&lt;/p&gt;&lt;p&gt;If you do the calculation with the Isp at sea level, you get&lt;br /&gt;
&lt;br /&gt;
    mdot=215kN/320s*9.81m/s2&lt;br /&gt;
    =215000N/3139.2m/s3&lt;br /&gt;
    =68.49kg/s&lt;br /&gt;
&lt;br /&gt;
&lt;br /&gt;
and thus&lt;br /&gt;
&lt;br /&gt;
    t=m/mdot&lt;br /&gt;
    =2000kg/68.49kg/s&lt;br /&gt;
    =29.20s&lt;/p&gt;&lt;p&gt;Photo by &lt;a href="https://www.23hq.com/Corax/"&gt;Corax&lt;/a&gt;&lt;/p&gt;</description>
            <guid>https://www.23hq.com/Corax/photo/8132070</guid>
            <pubDate>Fri, 31 Aug 2012 10:16:02 GMT</pubDate>
            <media:content url="https://www.23hq.com/7828204/8132070_c38fe6f4c483582bec4d6c20a6b0743c_large.jpg" width="756" height="473"/>
            <media:thumbnail url="https://www.23hq.com/7828204/8132070_c38fe6f4c483582bec4d6c20a6b0743c_quad100.jpg" width="100" height="100"/>
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