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#11
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visualisation of the lift distribution over a wing
Stealth Pilot wrote:
/snip/ it is the air below pushing you up that lifts the wing. Stealth Pilot In most circumstances, suction on the upper surface contributes about 2/3 rds of the lift, and pressure on the lower surface contributes about 1/3 rd. That's one reason which rib stitching for rag wings is a biggy. Brian W |
#12
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visualisation of the lift distribution over a wing
brian whatcott wrote:
Stealth Pilot wrote: /snip/ it is the air below pushing you up that lifts the wing. Stealth Pilot In most circumstances, suction on the upper surface contributes about 2/3 rds of the lift, and pressure on the lower surface contributes about 1/3 rd. That's one reason which rib stitching for rag wings is a biggy. Brian W At high angle of attach - maybe 1/3 on the bottom. Especially along the leading edge. At cruise, I believe the lower surface is closer to ambient pressure. |
#13
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visualisation of the lift distribution over a wing
In article ,
brian whatcott wrote: Stealth Pilot wrote: /snip/ it is the air below pushing you up that lifts the wing. Stealth Pilot In most circumstances, suction on the upper surface contributes about 2/3 rds of the lift, and pressure on the lower surface contributes about 1/3 rd. That's one reason which rib stitching for rag wings is a biggy. Brian W Ummmm... It sort of depends what you mean. If you mean that suction is actually providing an upward force, you're quite mistaken. If you mean that the difference in pressure between upper and lower surfaces is 2/3 the result of lower pressure on the upper surface, then you might be right. I don't know. -- Alan Baker Vancouver, British Columbia http://gallery.me.com/alangbaker/100008/DSCF0162/web.jpg |
#14
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visualisation of the lift distribution over a wing
Alan Baker wrote:
In article , brian whatcott wrote: Stealth Pilot wrote: /snip/ it is the air below pushing you up that lifts the wing. Stealth Pilot In most circumstances, suction on the upper surface contributes about 2/3 rds of the lift, and pressure on the lower surface contributes about 1/3 rd. That's one reason which rib stitching for rag wings is a biggy. Brian W Ummmm... It sort of depends what you mean. If you mean that suction is actually providing an upward force, you're quite mistaken. If you mean that the difference in pressure between upper and lower surfaces is 2/3 the result of lower pressure on the upper surface, then you might be right. I don't know. Interesting comment: what would YOU call it when the fabric on the upper wing surface wants to pull away from the ribs? Brian W |
#15
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visualisation of the lift distribution over a wing
brian whatcott wrote:
Alan Baker wrote: In article , brian whatcott wrote: Stealth Pilot wrote: /snip/ it is the air below pushing you up that lifts the wing. Stealth Pilot In most circumstances, suction on the upper surface contributes about 2/3 rds of the lift, and pressure on the lower surface contributes about 1/3 rd. That's one reason which rib stitching for rag wings is a biggy. Brian W Ummmm... It sort of depends what you mean. If you mean that suction is actually providing an upward force, you're quite mistaken. If you mean that the difference in pressure between upper and lower surfaces is 2/3 the result of lower pressure on the upper surface, then you might be right. I don't know. Interesting comment: what would YOU call it when the fabric on the upper wing surface wants to pull away from the ribs? Brian W It's the "wind" blowing through the bottom surface, inflating the wing like a balloon |
#16
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visualisation of the lift distribution over a wing
In article ,
brian whatcott wrote: Alan Baker wrote: In article , brian whatcott wrote: Stealth Pilot wrote: /snip/ it is the air below pushing you up that lifts the wing. Stealth Pilot In most circumstances, suction on the upper surface contributes about 2/3 rds of the lift, and pressure on the lower surface contributes about 1/3 rd. That's one reason which rib stitching for rag wings is a biggy. Brian W Ummmm... It sort of depends what you mean. If you mean that suction is actually providing an upward force, you're quite mistaken. If you mean that the difference in pressure between upper and lower surfaces is 2/3 the result of lower pressure on the upper surface, then you might be right. I don't know. 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... -- Alan Baker Vancouver, British Columbia http://gallery.me.com/alangbaker/100008/DSCF0162/web.jpg |
#17
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visualisation of the lift distribution over a wing
"Alan Baker" wrote Air pressure from inside the wing pushing up on it more than the air above is pushing down... I hope you are pulling someone's leg, and that your are not that inept in the field of aerodynamics and physics. -- Jim in NC |
#18
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visualisation of the lift distribution over a wing
In article ,
"Morgans" wrote: "Alan Baker" wrote Air pressure from inside the wing pushing up on it more than the air above is pushing down... I hope you are pulling someone's leg, and that your are not that inept in the field of aerodynamics and physics. No, I'm quite serious. The reduction in *pressure* on the upper surface of the wing cannot produce any force except downward. A perfect vacuum over the entire upper surface wouldn't produce any upward force, but simply *zero* force; allowing the upward force on the lower surface to act alone. Anyone who thinks that the pressure of a fluid on a surface can act in any direction but towards the surface is simply wrong. -- Alan Baker Vancouver, British Columbia http://gallery.me.com/alangbaker/100008/DSCF0162/web.jpg |
#19
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visualisation of the lift distribution over a wing
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 |
#20
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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... 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 |
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