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#1
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visualisation of the lift distribution over a wing
admittedly it is an FA18 but it still comfirms classic lift theory http://www.airshowaction.com/axalp07/axalp07_227.jpg Stealth Pilot |
#2
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visualisation of the lift distribution over a wing
On Aug 1, 7:59*am, Stealth Pilot
wrote: admittedly it is an FA18 but it still comfirms classic lift theory http://www.airshowaction.com/axalp07/axalp07_227.jpg Stealth Pilot Stealth - I have posted the site address to http://eng-tips.com/viewthread.cfm?qid=251055&page=1 for their viewing. Thanks - good stuff. |
#3
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visualisation of the lift distribution over a wing
On Aug 4, 11:05*pm, 4p1e wrote:
On Aug 1, 7:59*am, Stealth Pilot wrote: admittedly it is an FA18 but it still comfirms classic lift theory Amen! I say to thee, a wing does NOT fly by pushing air down. Rather, it creates a difference in airspeed between the air on top of the wing and the air underneath it (relative to gravity or G-forces) which creates the difference in air pressure which causes what we call "lift". On hot humid days, reducing air pressure enough can cause condensation to form. Some people say it even causes clouds. Now before you flame me, remember that I did not say that a wing does not deflect some air downward (assuming down is the side toward the gravity). Only that thats not the primary source of "lift". Which of course has been known to science since two guys stuck a fan in the end of a box and blew around a bunch of old hacksaw blades. Harry Frey |
#4
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visualisation of the lift distribution over a wing
"Wright1902glider" wrote in message ... Amen! I say to thee, a wing does NOT fly by pushing air down. Rather, it creates a difference in airspeed between the air on top of the wing and the air underneath it (relative to gravity or G-forces) which creates the difference in air pressure which causes what we call "lift". I decided years ago to "stop deciding" and just believe that life comes from both theories. If you only look at the picture that started this thread, you will be left with no doubt about classic lift theory, but if you had spent as many hours as I have at the back end of a glider tow rope, you would know that the wake of an airplane is strongly deflected (accelerated) downward. (New airplane pilots learn about wake turbulence from pictures in books, but glider CFIs must take their students into the real thing on a daily basis.) Flying a short distance behind a tow plane, I am always flying in clean air unless I fly considerably *below* the tow plane. Even though I know better, from inside a glider on tow it sure looks like an airplane's lift comes from pushing air down. Vaughn |
#5
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visualisation of the lift distribution over a wing
"vaughn" wrote in message ... "Wright1902glider" wrote in message ... Amen! I say to thee, a wing does NOT fly by pushing air down. Rather, it creates a difference in airspeed between the air on top of the wing and the air underneath it (relative to gravity or G-forces) which creates the difference in air pressure which causes what we call "lift". I decided years ago to "stop deciding" and just believe that life comes from both theories. If you only look at the picture that started this thread, you will be left with no doubt about classic lift theory, but if you had spent as many hours as I have at the back end of a glider tow rope, you would know that the wake of an airplane is strongly deflected (accelerated) downward. (New airplane pilots learn about wake turbulence from pictures in books, but glider CFIs must take their students into the real thing on a daily basis.) Flying a short distance behind a tow plane, I am always flying in clean air unless I fly considerably *below* the tow plane. Even though I know better, from inside a glider on tow it sure looks like an airplane's lift comes from pushing air down. Vaughn Hope to do the glider rating thing next year. Sounds like a good add on and BFR resetter... Equal and opposite reaction, momentum theory, etc. The low pressure on top causes the air to deflect down...and I go up! Nothing like 720 power turns bumping through the second 360 as you go through your own wake... |
#6
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visualisation of the lift distribution over a wing
On Wed, 5 Aug 2009 20:14:30 -0400, "Dan D"
wrote: "vaughn" wrote in message ... "Wright1902glider" wrote in message ... Amen! I say to thee, a wing does NOT fly by pushing air down. Rather, it creates a difference in airspeed between the air on top of the wing and the air underneath it (relative to gravity or G-forces) which creates the difference in air pressure which causes what we call "lift". I decided years ago to "stop deciding" and just believe that life comes from both theories. If you only look at the picture that started this thread, you will be left with no doubt about classic lift theory, but if you had spent as many hours as I have at the back end of a glider tow rope, you would know that the wake of an airplane is strongly deflected (accelerated) downward. (New airplane pilots learn about wake turbulence from pictures in books, but glider CFIs must take their students into the real thing on a daily basis.) Flying a short distance behind a tow plane, I am always flying in clean air unless I fly considerably *below* the tow plane. Even though I know better, from inside a glider on tow it sure looks like an airplane's lift comes from pushing air down. Vaughn Hope to do the glider rating thing next year. Sounds like a good add on and BFR resetter... Equal and opposite reaction, momentum theory, etc. The low pressure on top causes the air to deflect down...and I go up! Nothing like 720 power turns bumping through the second 360 as you go through your own wake... although that all happens as you describe it is the air below pushing you up that lifts the wing. Stealth Pilot |
#7
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visualisation of the lift distribution over a wing
In article
, Wright1902glider wrote: On Aug 4, 11:05*pm, 4p1e wrote: On Aug 1, 7:59*am, Stealth Pilot wrote: admittedly it is an FA18 but it still comfirms classic lift theory Amen! I say to thee, a wing does NOT fly by pushing air down. Rather, it creates a difference in airspeed between the air on top of the wing and the air underneath it (relative to gravity or G-forces) which creates the difference in air pressure which causes what we call "lift". On hot humid days, reducing air pressure enough can cause condensation to form. Some people say it even causes clouds. Now before you flame me, remember that I did not say that a wing does not deflect some air downward (assuming down is the side toward the gravity). Only that thats not the primary source of "lift". Which of course has been known to science since two guys stuck a fan in the end of a box and blew around a bunch of old hacksaw blades. Harry Frey Actually, both models describe the same phenomenon. The Bernoulli principle explains the detailed mechanics of lift, while the momentum exchange model explains the end product physics of lift. After all, a symmetric airfoil generates lift by angle of attack, as does the "flat plate" airfoil, with zero camber. -- Remove _'s from email address to talk to me. |
#8
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visualisation of the lift distribution over a wing
Orval Fairbairn wrote:
Wright1902glider wrote: Amen! I say to thee, a wing does NOT fly by pushing air down. Rather, it creates a difference in airspeed between the air on top of the wing and the air underneath it (relative to gravity or G-forces) which creates the difference in air pressure which causes what we call "lift". ..... Harry Frey Actually, both models describe the same phenomenon. The Bernoulli principle explains the detailed mechanics of lift, while the momentum exchange model explains the end product physics of lift. After all, a symmetric airfoil generates lift by angle of attack, as does the "flat plate" airfoil, with zero camber. What he said Brian W |
#9
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visualisation of the lift distribution over a wing
In article
, Wright1902glider wrote: On Aug 4, 11:05*pm, 4p1e wrote: On Aug 1, 7:59*am, Stealth Pilot wrote: admittedly it is an FA18 but it still comfirms classic lift theory Amen! I say to thee, a wing does NOT fly by pushing air down. Rather, it creates a difference in airspeed between the air on top of the wing and the air underneath it (relative to gravity or G-forces) which creates the difference in air pressure which causes what we call "lift". On hot humid days, reducing air pressure enough can cause condensation to form. Some people say it even causes clouds. Now before you flame me, remember that I did not say that a wing does not deflect some air downward (assuming down is the side toward the gravity). Only that thats not the primary source of "lift". Which of course has been known to science since two guys stuck a fan in the end of a box and blew around a bunch of old hacksaw blades. Harry Frey You are -- I regret to tell you -- entirely wrong. Lift is only created if air is deflected downward. -- Alan Baker Vancouver, British Columbia http://gallery.me.com/alangbaker/100008/DSCF0162/web.jpg |
#10
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visualisation of the lift distribution over a wing
Wright1902glider wrote:
Amen! I say to thee, a wing does NOT fly by pushing air down. Rather, it creates a difference in airspeed between the air on top of the wing and the air underneath it (relative to gravity or G-forces) which creates the difference in air pressure which causes what we call "lift". Well then, you'd better contact NASA and tell them they need to correct the following: "Lift occurs when a moving flow of gas is turned by a solid object. The flow is turned in one direction, and the lift is generated in the opposite direction, according to Newton's Third Law of action and reaction." Quoted from: http://www.grc.nasa.gov/WWW/K-12/airplane/lift1.html "Lift is created by deflecting a flow of air," Quoted from: http://www.grc.nasa.gov/WWW/K-12/airplane/momntm.html On hot humid days, reducing air pressure enough can cause condensation to form. Some people say it even causes clouds. Inserting the word "adiabatically" right after the word "pressure" make the above a more reasonable assertion. Now before you flame me, Too late! :-) remember that I did not say that a wing does not deflect some air downward (assuming down is the side toward the gravity). Only that thats not the primary source of "lift". Which of course has been known to science since two guys stuck a fan in the end of a box and blew around a bunch of old hacksaw blades. Different physical situations. Incorrect analogy. |
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