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	<title>BERNOULLI</title>
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	<link>https://airforces.fr/category/topics/aeronautics/aerodynamics/bernoulli/</link>
	<description>ANGLAIS AERONAUTIQUE - HISTOIRE DE L&#039;AVIATION - Gustave Whitehead, Maxime Lenoir</description>
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		<title>WING LIFT THEORY SHAKEN &#8211; LA THÉORIE DE LA PORTANCE DE L&#8217;AILE ÉBRANLÉE</title>
		<link>https://airforces.fr/2017/04/26/wing-lift-theory-shaken-la-theorie-de-la-portance-de-laile-ebranlee/</link>
		
		<dc:creator><![CDATA[Toni GIACOIA]]></dc:creator>
		<pubDate>Wed, 26 Apr 2017 08:31:33 +0000</pubDate>
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		<guid isPermaLink="false">http://airforces.fr/?p=11119</guid>

					<description><![CDATA[<p>I had already written about that in my book UNE AUTRE HISTOIRE DE L&#8217;AVIATION, on pages 12; 13; 71; and others &#8211; Bernoulli&#8217;s principle does not explain everything. We know that aircraft fly. Strange as it may seem, Bernoulli&#8217;s principle<span class="ellipsis">&#8230;</span></p>
<div class="read-more"><a href="https://airforces.fr/2017/04/26/wing-lift-theory-shaken-la-theorie-de-la-portance-de-laile-ebranlee/">Lire la suite <span class="screen-reader-text">WING LIFT THEORY SHAKEN &#8211; LA THÉORIE DE LA PORTANCE DE L&#8217;AILE ÉBRANLÉE</span><span class="meta-nav"> &#8250;</span></a></div>
<p><!-- end of .read-more --></p>
<p>The post <a href="https://airforces.fr/2017/04/26/wing-lift-theory-shaken-la-theorie-de-la-portance-de-laile-ebranlee/">WING LIFT THEORY SHAKEN &#8211; LA THÉORIE DE LA PORTANCE DE L&rsquo;AILE ÉBRANLÉE</a> appeared first on <a href="https://airforces.fr">AVIATION ENGLISH</a>.</p>
]]></description>
										<content:encoded><![CDATA[<p><center><iframe width="560" height="315" src="https://www.youtube.com/embed/UqBmdZ-BNig" frameborder="0" allowfullscreen></iframe></center></p>
<p style="text-align: justify;">I had already written about that in my book <a href="https://www.amazon.fr/dp/1541120019/" target="_blank" rel="noopener noreferrer nofollow" class="broken_link">UNE AUTRE HISTOIRE DE L&rsquo;AVIATION</a>, on pages 12; 13; 71; and others &#8211; <a href="http://hyperphysics.phy-astr.gsu.edu/hbase/Fluids/airfoil.html">Bernoulli&rsquo;s principle</a> does not explain everything. We know that aircraft fly. Strange as it may seem, Bernoulli&rsquo;s principle has often been taught for decades as the explanation of the phenomenon.</p>
<p style="text-align: justify;"><em>Je l&rsquo;avais déjà évoqué dans mon livre « Une autre histoire de l&rsquo;aviation » aux pages 12, 13, 71, et d&rsquo;autres: Le théorème de Bernoulli n&rsquo;explique pas tout. Nous savons que les avions volent. Depuis des décennies, aussi bizarre que cela puisse paraître, on enseigne souvent le théorème de Bernoulli comme l&rsquo;explication principale au phénomène.</em></p>
<p style="text-align: justify;">This explanation would make sense if the air particles split at the leading edge of the wing and come together at the trailing edge. However, Cambridge researchers had debunked this flying myth in 2012, and have recently confirmed that Bernoulli&rsquo;s principle cannot explain everything in wing lift. As you can see on the video above, the upper wing air stream travels much faster than the lower wing one. Last but not least, these air streams do not come together at the trailing edge since the upper wing air stream reaches the trailing edge well before the lower wing airflow. Isn&rsquo;t this amazing?</p>
<p style="text-align: justify;"><em>Cette explication tiendrait si les particules d&rsquo;air se séparaient au bord d&rsquo;attaque de l&rsquo;aile et se rejoignaient au bord de fuite. Cependant, des chercheurs de Cambridge avaient démonté ce mythe du vol en 2012 et viennent de confirmer que le principe de de Bernoulli ne peut pas tout expliquer dans la portance de l&rsquo;aile. Comme vous pouvez le voir sur la vidéo ci-dessus, le flux d&rsquo;air en extrados voyage beaucoup plus vite que celui d&rsquo;intrados. Enfin et surtout, ces flux d&rsquo;air ne se rejoignent pas au bord de fuite puisque le flux d&rsquo;air d&rsquo;extrados atteint le bord de fuite bien avant le flux d&rsquo;intrados. Étonnant, n&rsquo;est-ce pas?</em></p>
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		<title>BERNOULLI&#8217;S PRINCIPLE</title>
		<link>https://airforces.fr/2008/12/27/bernoullis-principle/</link>
		
		<dc:creator><![CDATA[Toni G.]]></dc:creator>
		<pubDate>Sat, 27 Dec 2008 19:57:32 +0000</pubDate>
				<category><![CDATA[AERODYNAMICS]]></category>
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		<guid isPermaLink="false">http://airforces.fr/?p=1264</guid>

					<description><![CDATA[<p>Bernoulli&#8217;s principle  states that when  a fluid flowing through a tube reaches a constriction or narrowing  of the  tube  the speed  of  the  fluid  passing through the constriction is increased and its pressure is decreased. Source: http://www.tpub.com</p>
<p>The post <a href="https://airforces.fr/2008/12/27/bernoullis-principle/">BERNOULLI&rsquo;S PRINCIPLE</a> appeared first on <a href="https://airforces.fr">AVIATION ENGLISH</a>.</p>
]]></description>
										<content:encoded><![CDATA[<p style="text-align: justify;"><a href="https://airforces.fr/wp-content/uploads/2009/08/339564491.jpg" rel="attachment wp-att-336"><img loading="lazy" decoding="async" class="alignright size-full wp-image-336" title="Bernoulli Venturi tpub" src="/wp-content/uploads/2009/08/339564491.jpg" alt="Bernoulli's principle and Venturi tube" width="352" height="333" srcset="https://airforces.fr/wp-content/uploads/2009/08/339564491.jpg 352w, https://airforces.fr/wp-content/uploads/2009/08/339564491-300x284.jpg 300w, https://airforces.fr/wp-content/uploads/2009/08/339564491-25x25.jpg 25w" sizes="(max-width: 352px) 100vw, 352px" /></a>Bernoulli&rsquo;s principle  states that when  a fluid flowing through a tube reaches a constriction or narrowing  of the  tube  the speed  of  the  fluid  passing through the constriction is increased and its pressure is decreased.</p>
<p style="text-align: justify;">Source: <a href="https://www.tpub.com/">http://www.<b style="color: black; background-color: #a0ffff;">tpub</b>.com</a></p>
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		<title>HOW AIRPLANES FLY ?</title>
		<link>https://airforces.fr/2008/12/02/how-airplanes-fly/</link>
		
		<dc:creator><![CDATA[Toni G.]]></dc:creator>
		<pubDate>Tue, 02 Dec 2008 04:41:35 +0000</pubDate>
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		<guid isPermaLink="false">http://airforces.fr/?p=855</guid>

					<description><![CDATA[<p>What makes an airplane get off the ground and stay in the air? Easy to understand, the film combines animation and live sequences to explain everything about basic aerodynamics. Forces of lift, weight, thrust and drag are shown in relation<span class="ellipsis">&#8230;</span></p>
<div class="read-more"><a href="https://airforces.fr/2008/12/02/how-airplanes-fly/">Lire la suite <span class="screen-reader-text">HOW AIRPLANES FLY ?</span><span class="meta-nav"> &#8250;</span></a></div>
<p><!-- end of .read-more --></p>
<p>The post <a href="https://airforces.fr/2008/12/02/how-airplanes-fly/">HOW AIRPLANES FLY ?</a> appeared first on <a href="https://airforces.fr">AVIATION ENGLISH</a>.</p>
]]></description>
										<content:encoded><![CDATA[<div align="center">
<p><object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" width="425" height="349" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,40,0"><param name="allowFullScreen" value="true" /><param name="allowscriptaccess" value="always" /><param name="src" value="http://www.youtube.com/v/ocni_Whz5EA&amp;hl=fr&amp;fs=1&amp;rel=0&amp;color1=0x3a3a3a&amp;color2=0x999999&amp;border=1" /><param name="allowfullscreen" value="true" /><embed type="application/x-shockwave-flash" width="425" height="349" src="http://www.youtube.com/v/ocni_Whz5EA&amp;hl=fr&amp;fs=1&amp;rel=0&amp;color1=0x3a3a3a&amp;color2=0x999999&amp;border=1" allowscriptaccess="always" allowfullscreen="true" wmode="transparent"/></object></p>
<p>What makes an airplane get off the ground and stay in the air? Easy to understand, the film combines animation and live sequences to explain everything about basic aerodynamics. Forces of lift, weight, thrust and drag are shown in relation to flight.
</p></div>
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