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	<title>Comments on: The Dangers of Flight Test</title>
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	<link>http://blog.aopa.org/leadingedge/?p=2134</link>
	<description>A place to discuss safety-of-flight issues, procedures, techniques, and judgment.</description>
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		<title>By: Alex</title>
		<link>http://blog.aopa.org/leadingedge/?p=2134&#038;cpage=1#comment-32080</link>
		<dc:creator>Alex</dc:creator>
		<pubDate>Mon, 10 Oct 2011 22:14:15 +0000</pubDate>
		<guid isPermaLink="false">http://blog.aopa.org/leadingedge/?p=2134#comment-32080</guid>
		<description><![CDATA[@Dick Van Pelt

Pitch stability is a result of Xcg - Xac, where X is a distance from a datum forward of the airplane (arbitrary so long as consistent), and cg and ac refer to locations of center of gravity and aerodynamic center, respectively (aerodynamic center is the location about which moment caused by lift is constant with angle of attack, and can be approximated as a function of the distribution of &quot;area&quot; of a top/bottom cross section of the aircraft with all wings/canards/stabilizers included).  There is no reason here, for static stability, that a canard configuration cannot provide equal pitch stability for most purposes.

In this case, the thrust axis did not pass through the CG, which will induce a moment.  In a very small airplane such as the one described, engines placed above or in line with a high wing may induce quite a large moment relative to the moment provided by the canards mounted on a relatively short fuselage.

If, like some canard designs, the thrust axis is through the CG, the flying characteristics can be made very similar, albeit with a more limited CG range due to the shorter moment arm of the canards and likewise shorter fuselage.]]></description>
		<content:encoded><![CDATA[<p>@Dick Van Pelt</p>
<p>Pitch stability is a result of Xcg &#8211; Xac, where X is a distance from a datum forward of the airplane (arbitrary so long as consistent), and cg and ac refer to locations of center of gravity and aerodynamic center, respectively (aerodynamic center is the location about which moment caused by lift is constant with angle of attack, and can be approximated as a function of the distribution of &#8220;area&#8221; of a top/bottom cross section of the aircraft with all wings/canards/stabilizers included).  There is no reason here, for static stability, that a canard configuration cannot provide equal pitch stability for most purposes.</p>
<p>In this case, the thrust axis did not pass through the CG, which will induce a moment.  In a very small airplane such as the one described, engines placed above or in line with a high wing may induce quite a large moment relative to the moment provided by the canards mounted on a relatively short fuselage.</p>
<p>If, like some canard designs, the thrust axis is through the CG, the flying characteristics can be made very similar, albeit with a more limited CG range due to the shorter moment arm of the canards and likewise shorter fuselage.</p>
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		<title>By: Dick Van Pelt</title>
		<link>http://blog.aopa.org/leadingedge/?p=2134&#038;cpage=1#comment-31966</link>
		<dc:creator>Dick Van Pelt</dc:creator>
		<pubDate>Fri, 07 Oct 2011 12:10:26 +0000</pubDate>
		<guid isPermaLink="false">http://blog.aopa.org/leadingedge/?p=2134#comment-31966</guid>
		<description><![CDATA[I have never seen an explanation of how a canard aircraft can be designed to provide pitch stability similar to a tail controlled aircraft. Can someone explain or provide a good reference on the subject?]]></description>
		<content:encoded><![CDATA[<p>I have never seen an explanation of how a canard aircraft can be designed to provide pitch stability similar to a tail controlled aircraft. Can someone explain or provide a good reference on the subject?</p>
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		<title>By: Mark Jones Jr</title>
		<link>http://blog.aopa.org/leadingedge/?p=2134&#038;cpage=1#comment-31960</link>
		<dc:creator>Mark Jones Jr</dc:creator>
		<pubDate>Fri, 07 Oct 2011 09:49:57 +0000</pubDate>
		<guid isPermaLink="false">http://blog.aopa.org/leadingedge/?p=2134#comment-31960</guid>
		<description><![CDATA[One of the good and bad characteristics of General Aviation is that people can do whatever they want with their airplanes.  The first example is CLEARLY part of the &quot;general&quot; aviation.  Maybe we don&#039;t want it to be, but I think it belongs, because along with our freedoms as general aviators, we have some responsibilities. 

I do agree, however, that the Gulfstream crash should not be considered &quot;general aviation.&quot;

The bigger picture that we are missing is this:
THE NUMBERS DON&#039;T MATTER! What matters is the true interpretation of the data.

If we can&#039;t get a bloated, ineffective federal agency to change the way they push paper, then stop trying. 

The president isn&#039;t going to save the aviation industry. The NTSB isn&#039;t going to change the culture of pilots. We are losing because we are fighting the battle with groups who have more money and people using their tactics.

WE CONTROL OUR OWN DESTINY! 

Frankly, I&#039;d be delighted to see more stories that inspire me to lead my fellow pilots in a culture of legacy and safety.]]></description>
		<content:encoded><![CDATA[<p>One of the good and bad characteristics of General Aviation is that people can do whatever they want with their airplanes.  The first example is CLEARLY part of the &#8220;general&#8221; aviation.  Maybe we don&#8217;t want it to be, but I think it belongs, because along with our freedoms as general aviators, we have some responsibilities. </p>
<p>I do agree, however, that the Gulfstream crash should not be considered &#8220;general aviation.&#8221;</p>
<p>The bigger picture that we are missing is this:<br />
THE NUMBERS DON&#8217;T MATTER! What matters is the true interpretation of the data.</p>
<p>If we can&#8217;t get a bloated, ineffective federal agency to change the way they push paper, then stop trying. </p>
<p>The president isn&#8217;t going to save the aviation industry. The NTSB isn&#8217;t going to change the culture of pilots. We are losing because we are fighting the battle with groups who have more money and people using their tactics.</p>
<p>WE CONTROL OUR OWN DESTINY! </p>
<p>Frankly, I&#8217;d be delighted to see more stories that inspire me to lead my fellow pilots in a culture of legacy and safety.</p>
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