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Nasa has some great tutorials on aerodynamics, rockets,
etc. Check this page, then hit the 'next' arrow at the bottom. Also, bounce around the text links. Good stuff. Their foilsim site is fun, too. http://www.grc.nasa.gov/WWW/K-12/airplane/wrong1.html At 23:30 09 January 2006, 1moclimb wrote: Bernoulli is not explaining 70% of the lift an ordinary airfoil generates. Bernoulli completely fails when using a flat plate which creates plenty of lift at normal angles of attack. Newton, bah humbug! The key to understanding lift is circulation, nothing else gives compliance with wind tunnel and test data. Problem is that it takes about 20 minutes to read through the whole story and many people give up before they understand. Here is by far the best explanation I have found: http://www.av8n.com/how/htm/airfoils.html This guy put an entire book about flight training on the web, God bless him! He disposes with many myths that simple minded and uneducated wannabe physicists promote, you gotta love it! Ken, I know you as a reasonably smart guy, you're gonna figure it out! Herb, J7 Capt. Geoffrey Thorpe wrote: Spell checking is left as an excercise for the reader. 'Ken Kochanski (KK)' wrote in message oups.com... OK, what is the better explanation to give fledgling students. Should you say the wing deflects/pushes/thrusts the air down to hold the aircraft up ... or should you say the wing/airflow creates a low pressure area that sucks the wing/aircraft upwards. Like many people, Bernoulli was the initial and only explanation I was aware of ... but I now think it is easier and more accurate to explain that a wing/airfolil pushes the air downward. Yes, you do have pressure differences, but that is just an artifact of the process. A Bernoulli based explanation seems to create some inconsistencies. Berhoulli's equation (pressure + (1/2 *density* velocity squared) +(densty*g*elevation) = constant) is simply a special case of Newtons law applied to ideal gasses under specific circunstances. So, no inconsistancies, no problems. Air is deflected. Delta pressures are created. -- Geoff the sea hawk at wow way d0t com remove spaces and make the obvious substitutions to reply by mail |
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