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Search: Posts Made By: LouW
Showing results 1 to 25 of 56
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Forum: Aerodynamics
05-31-2004, 05:11 PM
Replies: 262
Views: 29,571
Posted By LouW

RE: Bernoulli's equation

After the wing has passed, the low pressure area has passed with it so there is no motivation for continued upward momentum. There is not even any upward momentum to continue since the air was...
Forum: Aerodynamics
05-31-2004, 09:54 AM
Replies: 262
Views: 29,571
Posted By LouW

RE: Bernoulli's equation

Very well said, Ben. I've been away for a little while, but let me run this by the group.

I have been criticized by some in this forum for using such everyday standard english terms as, air...
Forum: Aerodynamics
05-25-2004, 12:58 PM
Replies: 262
Views: 29,571
Posted By LouW

RE: closure

Since several are making kind of a closing summary I just might as well too.

Observations:

When a real wing, producing lift, passes through air:

1. It always deflects some air...
Forum: Aerodynamics
05-24-2004, 08:15 PM
Replies: 262
Views: 29,571
Posted By LouW

RE: Fundamental Concepts and Misunderstanding

So close yet not quite there……’tis a shame’

When a jeweler is examining a precious stone with his glass, he moves it around to catch the light on different facets. The different...
Forum: Aerodynamics
05-23-2004, 06:12 PM
Replies: 262
Views: 29,571
Posted By LouW

RE: Comments

You and shoe are right of course. Everyone knows that air can't "pull" and The only "scientific" reference datum for pressure is the hard vacuum of interstellar space. It is obvious that since...
Forum: Aerodynamics
05-22-2004, 11:50 AM
Replies: 262
Views: 29,571
Posted By LouW

RE: Comments

(Dick, consider yourself forewarned. This is a long ramble on the esoteric field of aerodynamics, and if you have no interest, just don’t read it.)

Shoe, I can identify with Ken who is...
Forum: Aerodynamics
05-10-2004, 04:31 PM
Replies: 262
Views: 29,571
Posted By LouW

RE: Bernoulli's equation

As one of the culprits who has written several of the more tedious responses, I have asked myself the same question. In spite of my background as an engineer, I confess that most of my own model...
Forum: Aerodynamics
05-10-2004, 04:25 PM
Replies: 262
Views: 29,571
Posted By LouW

RE: Comments

Shoe, I appreciate your reply. The example you gave neither proves nor disproves anything. The data simply shows the initial formation of the wingtip vortex. By far most of the air affected...
Forum: Aerodynamics
05-08-2004, 10:28 PM
Replies: 262
Views: 29,571
Posted By LouW

RE: Comments

Do it.
Forum: Aerodynamics
05-08-2004, 08:05 PM
Replies: 262
Views: 29,571
Posted By LouW

RE: Comments

I think we are near a breakthrough. I feel kinda like a psychiatrist whose patient has just admitted he hates his father. There is still a lot to do, but it’s a start. I proceed.

For...
Forum: Aerodynamics
05-07-2004, 05:10 PM
Replies: 262
Views: 29,571
Posted By LouW

RE: Hi Hal

Shoe, you are falling for a trap that almost got me when I was thinking this through. Water only has buoyancy because of its inertia reacting to the acceleration of gravity. This is the same...
Forum: Aerodynamics
05-07-2004, 08:37 AM
Replies: 262
Views: 29,571
Posted By LouW

RE: Hi Hal

Now that you’ve gotten that little toilet humor out of your system, maybe we can have an adult discussion. I have a question.

Solids can exert or react to a force by deformation (elastic...
Forum: Aerodynamics
05-04-2004, 08:37 AM
Replies: 262
Views: 29,571
Posted By LouW

RE: My head hurts.... LOL

I believe I know some of how Dr. Frankenstein must have felt. It seems this post is no longer a discussion of technology, but philosophy, and I must have inadvertedly precipitated it.

I meant...
Forum: Aerodynamics
05-03-2004, 01:31 PM
Replies: 262
Views: 29,571
Posted By LouW

RE: My head hurts.... LOL

Great response. My head hurts a little too. The sun is shining after a rainy week in so I'm going flying.

(At some future time it might be interesting to explore the implications of power. ...
Forum: Aerodynamics
05-02-2004, 07:05 PM
Replies: 262
Views: 29,571
Posted By LouW

RE: Bernoulli's equation

Ken, my sincere apology. I didn't intend a personal attack. That was just my way of introducing some basics for any reader. I certainly accept "valid engineering simplifications". As I...
Forum: Aerodynamics
05-02-2004, 01:09 PM
Replies: 262
Views: 29,571
Posted By LouW

RE: Bernoulli's equation

Shoe, please indulge me. I’m going to first respond to Ken’s comments, and if your questions aren’t covered I will answer them separately.

Ken, I am beginning to suspect that our seeming...
Forum: Aerodynamics
04-29-2004, 01:13 PM
Replies: 262
Views: 29,571
Posted By LouW

RE: Bernoulli's equation

I stand corrected, but you make my point. The flow equations are indeed based on conservation of energy and the missing term I was referring to is a change of energy within the boundary.
Forum: Aerodynamics
04-29-2004, 10:57 AM
Replies: 262
Views: 29,571
Posted By LouW

RE: Bernoulli's equation

It seems we keep having trouble with the word “significantly”. You use it to refer to “magnitude”, while what I mean is “affect”. There is no argument that the wake of an airplane...
Forum: Aerodynamics
04-26-2004, 10:09 AM
Replies: 262
Views: 29,571
Posted By LouW

RE: Bernoulli's equation

I guess I'm missing it. Why don't you explain it to me?


Dick, it is sort of a tempest in a teapot. Engineers are to some degree like the philosophers of old. They like to like to know...
Forum: Aerodynamics
04-26-2004, 08:30 AM
Replies: 262
Views: 29,571
Posted By LouW

RE: Bernoulli's equation

Come on, shoe. We both know that any disturbance of the air at 30,000 feet is dissipated long before it can reach the ground. (Oh, I know that somewhere in the bowels of advanced quantum...
Forum: Aerodynamics
04-26-2004, 08:16 AM
Replies: 262
Views: 29,571
Posted By LouW

RE: Bernoulli's equation

Apparently you have not read any of my posts beyond the point of assuming I was wrong. I will try one more time to explain.

First let’s clear something up that is clouding the picture. ...
Forum: Aerodynamics
04-25-2004, 01:47 PM
Replies: 262
Views: 29,571
Posted By LouW

RE: Bernoulli's equation

Give me an example where a body significantly effects the air at a considerable distance. or where some motion of the air, not in the vicinity of a body, significantly affects the aerodynamic forces...
Forum: Aerodynamics
04-25-2004, 08:24 AM
Replies: 262
Views: 29,571
Posted By LouW

RE: Bernoulli's equation

Could it be that this whole controversy between pressure and momentum is simply a lack of communication? I have never said (and don't believe I've ever read) that momentum was added to the overall...
Forum: Aerodynamics
04-24-2004, 04:00 PM
Replies: 262
Views: 29,571
Posted By LouW

RE: Bernoulli's equation

There are two errors in your response. First, air doesn’t “flow” over a wing. The air is essentially stationary and the wing moves through it. As far as the wing (and the math) is...
Forum: Aerodynamics
04-23-2004, 08:33 PM
Replies: 262
Views: 29,571
Posted By LouW

RE: Bernoulli's equation

As a philosophical argument this is kinda like the “number of angels on the head of a pin” thing. It can be argued that a butterfly alighting on a rock in Africa moves the earth slightly in...
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