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	<title>Comments on: Our Earth: Spinning faster, covered in filth</title>
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	<link>http://blogs.law.harvard.edu/philg/2003/06/07/our-earth-spinning-faster-covered-in-filth/</link>
	<description>A posting every day; an interesting idea every three months...</description>
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		<title>By: Philip Greenspun</title>
		<link>http://blogs.law.harvard.edu/philg/2003/06/07/our-earth-spinning-faster-covered-in-filth/comment-page-1/#comment-4685</link>
		<dc:creator>Philip Greenspun</dc:creator>
		<pubDate>Thu, 12 Jun 2003 19:57:42 +0000</pubDate>
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		<description>&lt;a&gt;&lt;/a&gt;

We flew Cessna 172s in Israel.  These are 4-seat airplanes very much like my Diamond Star.  A 747 is smoother in flight than a paper airplane like mine due to higher wing loading (more weight per square foot of wing).  But there are two things that make it tough to land a big jet smoothly:  (1) you don&#039;t really flare a jet but almost fly it onto the runway, and (2) the damn thing weighs 500,000 pounds so it has a lot more energy to dissipate than a 4-seater.

With a light airplane you roundout and flare by pulling back on the stick as you get within a few feet of the ground.  You continue pulling back to shed airspeed and arrest your vertical descent.  If you&#039;re really good and/or you have a longish runway you can touch my Diamond Star down so that the passengers barely notice.  That&#039;s because you&#039;re only going maybe 50 miles per hour and the vertical descent rate is minimal.  With a big jet I think it is considered unsafe to fly very slowly close to the runway.  You&#039;re going 150 mph and a gust a wind might blow you to the side.  Basically the idea is to get the wheels on the ground and deploy the spoilers and to slow down and stop flying ASAP.</description>
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<p>We flew Cessna 172s in Israel.  These are 4-seat airplanes very much like my Diamond Star.  A 747 is smoother in flight than a paper airplane like mine due to higher wing loading (more weight per square foot of wing).  But there are two things that make it tough to land a big jet smoothly:  (1) you don&#8217;t really flare a jet but almost fly it onto the runway, and (2) the damn thing weighs 500,000 pounds so it has a lot more energy to dissipate than a 4-seater.</p>
<p>With a light airplane you roundout and flare by pulling back on the stick as you get within a few feet of the ground.  You continue pulling back to shed airspeed and arrest your vertical descent.  If you&#8217;re really good and/or you have a longish runway you can touch my Diamond Star down so that the passengers barely notice.  That&#8217;s because you&#8217;re only going maybe 50 miles per hour and the vertical descent rate is minimal.  With a big jet I think it is considered unsafe to fly very slowly close to the runway.  You&#8217;re going 150 mph and a gust a wind might blow you to the side.  Basically the idea is to get the wheels on the ground and deploy the spoilers and to slow down and stop flying ASAP.</p>
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		<title>By: Richard Anderson</title>
		<link>http://blogs.law.harvard.edu/philg/2003/06/07/our-earth-spinning-faster-covered-in-filth/comment-page-1/#comment-4683</link>
		<dc:creator>Richard Anderson</dc:creator>
		<pubDate>Thu, 12 Jun 2003 17:16:03 +0000</pubDate>
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		<description>&lt;a&gt;&lt;/a&gt;

I see that you are a pilot Philip, so maybe I am being a bit presumptuous with this comment... would not a 747 generally, as a rule, provide a smoother &quot;landing experience&quot; than a smaller craft? What model of plane did you fly from Tel Aviv?</description>
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<p>I see that you are a pilot Philip, so maybe I am being a bit presumptuous with this comment&#8230; would not a 747 generally, as a rule, provide a smoother &#8220;landing experience&#8221; than a smaller craft? What model of plane did you fly from Tel Aviv?</p>
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		<title>By: Doug</title>
		<link>http://blogs.law.harvard.edu/philg/2003/06/07/our-earth-spinning-faster-covered-in-filth/comment-page-1/#comment-4672</link>
		<dc:creator>Doug</dc:creator>
		<pubDate>Mon, 09 Jun 2003 22:18:56 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.law.harvard.edu/philgtest/2003/06/07/our-earth-spinning-faster-covered-i#comment-4672</guid>
		<description>&lt;a&gt;&lt;/a&gt;

If the whole &quot;earth is spinning faster&quot; thing is true, then how long will the day be if/when the polar ice caps melt?</description>
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<p>If the whole &#8220;earth is spinning faster&#8221; thing is true, then how long will the day be if/when the polar ice caps melt?</p>
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		<title>By: ssp</title>
		<link>http://blogs.law.harvard.edu/philg/2003/06/07/our-earth-spinning-faster-covered-in-filth/comment-page-1/#comment-4661</link>
		<dc:creator>ssp</dc:creator>
		<pubDate>Sun, 08 Jun 2003 02:49:35 +0000</pubDate>
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		<description>&lt;a&gt;&lt;/a&gt;

&lt;em&gt;Doubtful&lt;/em&gt;

Having &#039;enjoyed&#039; many flights on European planes, some on African planes, and a few on American planes, I have come to the conclusion that the smoothness of a landing is merely a matter of luck. Mostly it&#039;s nice and smooth, sometimes it&#039;s a bit bumpy. Thus I wouldn&#039;t agree on your point concerning European pilots and put it down to bad luck. If, however, you&#039;d settle for Lufthansa crews being among the least (genuinely) friendly, I&#039;d wholeheartedly agree.</description>
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<p><em>Doubtful</em></p>
<p>Having &#8216;enjoyed&#8217; many flights on European planes, some on African planes, and a few on American planes, I have come to the conclusion that the smoothness of a landing is merely a matter of luck. Mostly it&#8217;s nice and smooth, sometimes it&#8217;s a bit bumpy. Thus I wouldn&#8217;t agree on your point concerning European pilots and put it down to bad luck. If, however, you&#8217;d settle for Lufthansa crews being among the least (genuinely) friendly, I&#8217;d wholeheartedly agree.</p>
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