A aviation & planes forum. AviationBanter

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

Go Back   Home » AviationBanter forum » rec.aviation newsgroups » Home Built
Site Map Home Register Authors List Search Today's Posts Mark Forums Read Web Partners

visualisation of the lift distribution over a wing



 
 
Thread Tools Display Modes
  #21  
Old November 30th 09, 04:08 AM posted to rec.aviation.homebuilt
Alan Baker
external usenet poster
 
Posts: 244
Default 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  
Old November 30th 09, 04:19 AM posted to rec.aviation.homebuilt
cavelamb[_2_]
external usenet poster
 
Posts: 257
Default 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  
Old November 30th 09, 04:20 AM posted to rec.aviation.homebuilt
cavelamb[_2_]
external usenet poster
 
Posts: 257
Default 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  
Old November 30th 09, 05:38 AM posted to rec.aviation.homebuilt
Brian Whatcott
external usenet poster
 
Posts: 915
Default 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  
Old November 30th 09, 05:39 AM posted to rec.aviation.homebuilt
Morgans[_2_]
external usenet poster
 
Posts: 3,924
Default 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  
Old November 30th 09, 06:20 AM posted to rec.aviation.homebuilt
Beryl[_3_]
external usenet poster
 
Posts: 52
Default 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  
Old November 30th 09, 06:48 AM posted to rec.aviation.homebuilt
cavelamb[_2_]
external usenet poster
 
Posts: 257
Default 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  
Old November 30th 09, 06:49 AM posted to rec.aviation.homebuilt
Jim Logajan
external usenet poster
 
Posts: 1,958
Default 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  
Old November 30th 09, 06:55 AM posted to rec.aviation.homebuilt
cavelamb[_2_]
external usenet poster
 
Posts: 257
Default 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  
Old November 30th 09, 07:10 AM posted to rec.aviation.homebuilt
Morgans[_2_]
external usenet poster
 
Posts: 3,924
Default 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


 




Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Pressure Distribution Charts sisu1a Soaring 0 September 21st 08 05:53 PM
Soundwaves Boost Wing Lift [email protected] Home Built 30 September 5th 05 10:21 PM
747 weight distribution Robin General Aviation 25 June 22nd 05 03:53 AM
Distribution of armor on a B-52 B2431 Military Aviation 12 August 16th 04 09:07 PM
Alternator load distribution in a Baron Viperdoc Owning 7 December 9th 03 11:27 PM


All times are GMT +1. The time now is 10:40 PM.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 AviationBanter.
The comments are property of their posters.