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	<title>SpaceBuild &#187; General</title>
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	<description>Spacecraft technology</description>
	<lastBuildDate>Thu, 10 Feb 2011 20:59:53 +0000</lastBuildDate>
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		<title>Spaceports &amp; launch sites</title>
		<link>http://www.spacebuild.net/s1/general/402/</link>
		<comments>http://www.spacebuild.net/s1/general/402/#comments</comments>
		<pubDate>Thu, 10 Feb 2011 20:38:08 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[General]]></category>
		<category><![CDATA[Resources]]></category>
		<category><![CDATA[facilities]]></category>
		<category><![CDATA[fuelling]]></category>
		<category><![CDATA[launch]]></category>
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		<category><![CDATA[spaceport]]></category>

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		<description><![CDATA[Spaceports New / Potential Launch sites The Scottish National Party is calling for an RAF airbase in Moray to become the UK&#8217;s first commercial spaceport. The base has already been identified by Virgin Galactic as a possible location for a commercial space enterprise. Speaking earlier this month, Virgin Galactic president Will Whitehorn said that wealthy space tourists could be blasting off from RAF Lossiemouth within the next five years, but that another Scottish airbase and one in south west England were also suitable. RAF Lossiemouth Commercial Launch sites Civilian Aerospace Test Center &#8211; Mojave desert Southwest Regional Spaceport &#8211; New Mexico * New Mexico will be home of the X Prize Cup, the annual rocket festival conceived as a follow-up to the Ansari X Prize. British-based Starchaser Industries already has opened an office in New Mexico and plans to begin flying suborbital space vehicles there as early as 2006. Southwest Regional Spaceport, Upham, New Mexico, will be the launch base for the new SpaceShip Two commercial venture jointly run by Burt Rutan and Virgin Galactic. Officials from Virgin Galactic and from the State of New Mexico announced that they have reached an historic agreement which will see the building of [...]]]></description>
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		<title>Nuclear Thermal Propulsion</title>
		<link>http://www.spacebuild.net/s1/general/222/</link>
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		<pubDate>Wed, 05 Jan 2011 20:47:23 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[General]]></category>
		<category><![CDATA[Nuclear]]></category>

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		<description><![CDATA[Radiation created by nuclear technologies is dangerous to both humans and their machines. Any use of nuclear propulsion technology would have to be accompanied by the use of extensive shielding and &#8220;hardening.&#8221; The potential advantages of nuclear propulsion over chemical methods are staggering. The energy that is available from nuclear reactions (fission, fusion, and matter-antimatter annihilation) can exceed a hundred times that of chemical reactions. Fission The energy available from a unit mass of fissionable material is approximately 107 times larger than that available from the most energetic chemical reactions. A &#8220;typical&#8221; solid-core nuclear rocket engine utilising fissionable material is shown in the diagram below. In this engine, the propellant is heated as it passes through a heat-generating solid fuel core (nuclear reactor). Material constraints are a limiting factor in the performance of solid core nuclear rockets. The maximum operating temperature of the working fluid (e.g., hydrogen) must be less than the melting point of the fuel, moderator, and core structural materials. This corresponds to specific impulses of around 800 to 900 lbf-s/lbm. (Frisbee, 2000k)]]></description>
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		<title>Rocket Engine basics – an overview</title>
		<link>http://www.spacebuild.net/s1/general/295/</link>
		<comments>http://www.spacebuild.net/s1/general/295/#comments</comments>
		<pubDate>Thu, 09 Dec 2010 20:31:02 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[General]]></category>
		<category><![CDATA[Propulsion]]></category>

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		<description><![CDATA[All of the propulsion technologies we have discussed on this site will improve our ability to achieve orbit from the Earth&#8217;s surface, but will have limited utility in travelling to other planets. The primary rocket engine technology at the present time is the chemical rocket engine, and it is likely to remain the dominant technology for some time to come. All rocket vehicles work on the principle of reaction, or &#8220;recoil&#8221;, which is a consequence of the law of conservation of momentum. If a cannon fires a cannonball, the cannonball flies away with a momentum equal to the mass of the cannonball times its velocity. The shot gives the cannon the same momentum in the opposite direction, and if it were free to move without interference from friction or other constraint, it would fly backward, with a velocity less than that of the cannonball by the same factor that the cannon&#8217;s mass is greater than the cannonball. For example, if the cannon weighs 25 times more than the cannonball, its velocity will be 25 times less than that of the cannonball. There&#8217;s a popular misconception that a rocket vehicle &#8220;pushes against the air&#8221;, but that&#8217;s not the case. It pushes [...]]]></description>
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