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#21
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visualisation of the lift distribution over a wing
In article ,
brian whatcott wrote: Alan Baker wrote: Interesting comment: what would YOU call it when the fabric on the upper wing surface wants to pull away from the ribs? Air pressure from inside the wing pushing up on it more than the air above is pushing down... Let me take a wild guess he you did physics for an uundergraduate degree. Is that right? Brian W No. But it doesn't matter. If the fabric is moving upward, it can only be because there is more pressure on its bottom surface than there is on its top surface. -- Alan Baker Vancouver, British Columbia http://gallery.me.com/alangbaker/100008/DSCF0162/web.jpg |
#22
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visualisation of the lift distribution over a wing
Steve Hix wrote:
In article , brian whatcott wrote: Alan Baker wrote: Interesting comment: what would YOU call it when the fabric on the upper wing surface wants to pull away from the ribs? Air pressure from inside the wing pushing up on it more than the air above is pushing down... For a couple of seconds, perhaps. Wings aren't typically hermetically sealed. Let me take a wild guess he you did physics for an uundergraduate degree. Is that right? Brian W I'll take Physics Majors for $500, Alex! |
#23
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visualisation of the lift distribution over a wing
Alan Baker wrote:
In article , brian whatcott wrote: Alan Baker wrote: Interesting comment: what would YOU call it when the fabric on the upper wing surface wants to pull away from the ribs? Air pressure from inside the wing pushing up on it more than the air above is pushing down... Let me take a wild guess he you did physics for an uundergraduate degree. Is that right? Brian W No. But it doesn't matter. If the fabric is moving upward, it can only be because there is more pressure on its bottom surface than there is on its top surface. I'm kind of curious about how that higher pressure got on the bottom of that wing though... |
#24
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visualisation of the lift distribution over a wing
Alan Baker wrote:
In article , brian whatcott wrote: Alan Baker wrote: Interesting comment: what would YOU call it when the fabric on the upper wing surface wants to pull away from the ribs? Air pressure from inside the wing pushing up on it more than the air above is pushing down... Let me take a wild guess he you did physics for an uundergraduate degree. Is that right? Brian W No. But it doesn't matter. If the fabric is moving upward, it can only be because there is more pressure on its bottom surface than there is on its top surface. It seems that you are uncomfortable with the entire concept of suction. For example, how do you suppose suction cups work? Or how about a suction pump that happens to be limited to a 30 ft lift? Well duh, it's also atmospheric pressure that enables suction pumps and suction cups etc., etc. Yes indeed , but it's an academic issue at the junior high level, isn't it? Brian W |
#25
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visualisation of the lift distribution over a wing
"Alan Baker" wrote Anyone who thinks that the pressure of a fluid on a surface can act in any direction but towards the surface is simply wrong. I see. You are not lookng at the wing as a system, but taking an observation at one point only, without reguard to what is happening around it. Point made. -- Jim in NC |
#26
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visualisation of the lift distribution over a wing
Morgans wrote:
"Alan Baker" wrote Anyone who thinks that the pressure of a fluid on a surface can act in any direction but towards the surface is simply wrong. I see. You are not lookng at the wing as a system, but taking an observation at one point only, without reguard to what is happening around it. Point made. He looked inside the wing, at the entire upper surface, at the lower surface... that pretty much covers most of it. Air can't be in tension. |
#27
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visualisation of the lift distribution over a wing
brian whatcott wrote:
Alan Baker wrote: In article , brian whatcott wrote: Alan Baker wrote: Interesting comment: what would YOU call it when the fabric on the upper wing surface wants to pull away from the ribs? Air pressure from inside the wing pushing up on it more than the air above is pushing down... Let me take a wild guess he you did physics for an uundergraduate degree. Is that right? Brian W No. But it doesn't matter. If the fabric is moving upward, it can only be because there is more pressure on its bottom surface than there is on its top surface. Have you ever seen the top surface of a fabric covered wing? The skin does not bulge upwards. Not usually anyway. |
#28
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visualisation of the lift distribution over a wing
Beryl wrote:
Air can't be in tension. If it had a stressful day it might become tense. Air can be under a lot of pressure at times, and work can cause it to get hot. Put under too much pressure, air can blow a gasket. That's why it's best to let air blow off steam after a hard day at work and maybe offer it a smoke with a gin and tonic to cool off: http://www.bobblum.com/Images/Humor%.../subgenius.jpg |
#29
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visualisation of the lift distribution over a wing
Jim Logajan wrote:
Beryl wrote: Air can't be in tension. If it had a stressful day it might become tense. Air can be under a lot of pressure at times, and work can cause it to get hot. Put under too much pressure, air can blow a gasket. That's why it's best to let air blow off steam after a hard day at work and maybe offer it a smoke with a gin and tonic to cool off: http://www.bobblum.com/Images/Humor%.../subgenius.jpg I think it's about time for a little remedial aerodynamics for the group. http://www.messybeast.com/dragonqueen/liftdemon.htm LIFT DEMONS AND THRUST PIXIES Title of Paper: The Role of Lift Demons and Thrust Pixies in Heavier Than Air Flight Publication Date: 2004 Abstract: The role of Lift Demons in aeronautics was first explained in 1994 by Mary Shafer (NASA). Since then, Shafer's work has been explored and revised. This paper summarises advances in Lift Demon technology over the last decade. Keywords: Lift Demons, Thrust Pixies, lemon fondant Authors: Sarah Hartwell, DEF Smith, Peter Rieden, Gavin Bull |
#30
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visualisation of the lift distribution over a wing
"Beryl" wrote He looked inside the wing, at the entire upper surface, at the lower surface... that pretty much covers most of it. Air can't be in tension. Yes, but the person that observed that the pressure on the bottom was one third responsible (for lift) and the low pressure on top was responsible for two thirds of the lift is also correct, when you look at the wing as a whole system, even if those fractions are approximate. I think his view of individual points of observations are splitting toadstools. But that is my opinion, and like everyone, we all have but-holes and opinions. -- Jim in NC |
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