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	<title>SpaceBuild &#187; Solid Fuel</title>
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		<title>Solid Propellant Engine design</title>
		<link>http://www.spacebuild.net/s1/propulsion/solid-fuel-propulsion/321/</link>
		<comments>http://www.spacebuild.net/s1/propulsion/solid-fuel-propulsion/321/#comments</comments>
		<pubDate>Sat, 24 Jul 2010 21:06:22 +0000</pubDate>
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				<category><![CDATA[Engine design]]></category>
		<category><![CDATA[Solid Fuel]]></category>

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		<description><![CDATA[Solid-fuel rockets go back for centuries, and their fundamental form has remained much the same. They contain propellant formed in a solid cylindrical block, or &#8220;grain&#8221;, normally with a hole up the centre to ensure uniform burning of the propellant. The hole can have a variety of configurations that give different &#8220;thrust profiles&#8221;: for example, a cylindrical hole provides thrust that starts out low and increases as the hole widens, giving more area into the grain. Holes generally have configurations in the shape of various kinds of stars, which give the maximum area and thrust for initial burn. The hole is created by packing the fuel around a central &#8220;mandrel&#8221; piece that is removed after the packing is complete. A nozzle is generally attached to the base of the grain to provide better control of the exhaust. The traditional solid propellant, invented by the Chinese in the middle ages, is &#8220;black powder&#8221;, a mixture of a fuel composed of charcoal and sulfur, and an oxidizer consisting of &#8220;saltpeter&#8221; (potassium nitrate / KNO3). Black powder fireworks rockets are still in widespread use, since black powder does that job fine and is cheap. Conceptually similar military rocket projectiles were developed in World [...]]]></description>
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		<title>Solid Fuel Propulsion</title>
		<link>http://www.spacebuild.net/s1/propulsion/solid-fuel-propulsion/16/</link>
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		<pubDate>Tue, 14 Jul 2009 17:44:23 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Solid Fuel]]></category>
		<category><![CDATA[Propulsion]]></category>
		<category><![CDATA[solid fuel]]></category>

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		<description><![CDATA[Solid Fuel Solid-fuel rocket engines were the first engines created by man. They were invented by the Chinese in the 13th century and have been widely used since then. The &#8220;rocket&#8217;s red glare&#8221; in the American National Anthem, which was written in the early 1800&#8242;s, refers to the small solid-fuel rockets that were used to deliver bombs and incendiary devices during the War of 1812. The creation of solid-fuel rocket engines is fairly simple. They are made up of solid (dry) chemicals that, when ignited, burn very rapidly but will not explode. The exhaust gasses are directed through a nozzle that helps control and direct the gasses, providing accurate and even thrust. Although not generally used for interplanetary propulsion, solid chemical fuels are used in solid-rocket motors. Since solid-rocket motors cannot be throttled (turned off and on at will), they are of little use as a primary propulsion system for interplanetary missions. Solid-rocket motors are typically used in booster applications, to assist a spacecraft in lifting off from the Earth&#8217;s surface. Currently, the most visible example of solid-rocket motors can be seen on NASA&#8217;s space shuttle. The two white solid-rocket boosters (SRBs) are mounted to either side of the orange [...]]]></description>
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