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HomeAircraftHelicopterMain Discussion › blade aerodynamics question
03-03-2008 09:41 PM  10 years agoPost 61
GimbalFan (RIP)

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Big Coppitt Key, FL

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To restate an earlier question -- can a standard non-symmetrical airfoil moving forward at zero (or less) AoA cause lift without any perceivable net downward movement of air aft of the trailing edge?

op-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-t

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03-03-2008 09:50 PM  10 years agoPost 62
AirWolfRC

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42½ N, 83½ W

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Although simplistic and laid out for grade schools, it does outline the currently accepted theories on how the Newtonian effect is set up by the Bernoulli effect. They definitely shy away from leading you to believe that the low pressure created by the Bernoulli effect provides any direct lifting force.
The part I find interesting about all this lack of knowledge is how many people keep trying to expouse theories and yet the wing just keeps on flying in spite of your efforts fumbling with your "theories".

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03-03-2008 09:52 PM  10 years agoPost 63
GimbalFan (RIP)

rrProfessor

Big Coppitt Key, FL

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The part I find interesting about all this lack of knowledge is how many people keep trying to expouse theories and yet the wing just keeps on flying in spite of your efforts fumbling with your "theories".
A pompous ass who's often wrong once again bares his bottom. How endearing.

op-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-thwop-t

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03-03-2008 10:02 PM  10 years agoPost 64
Mark C

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Houston, TX - USA

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The part I find interesting about all this lack of knowledge is how many people keep trying to expouse theories and yet the wing just keeps on flying in spite of your efforts fumbling with your "theories".
Let's see.... Believe NASA's accepted theories or AirWolfRC's. Wow... tough decision.
To restate an earlier question -- can a standard non-symmetrical airfoil moving forward at zero (or less) AoA cause lift without any perceivable net downward movement of air aft of the trailing edge?
Here.... Give it a try. Adjust the camber % to 5 and you have a flat bottomed non-symmetrical airfoil moving through the air a 0 AOA. It shows definite downward deflection. And ya gotta have that to have lift (At least I believe so... Well me and NASA think so).

http://www.grc.nasa.gov/WWW/K-12/airplane/shape.html

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03-03-2008 10:17 PM  10 years agoPost 65
AirWolfRC

rrProfessor

42½ N, 83½ W

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Let's see.... Believe NASA's accepted theories or AirWolfRC's. Wow... tough decision.
You seem to think they're different . . . . why ? ?
Maybe it's just your (lack of) comprehension.

When you have designed, built and flown in your own aircraft, I might be inclined to give you more credit.

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03-03-2008 10:18 PM  10 years agoPost 66
hootowl

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Garnet Valley, Pa.

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So the answer is yes, you have lift but no downwash.

You think there is some downwash here?

Wolves don't lose sleep over the opinions of sheep

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03-03-2008 10:20 PM  10 years agoPost 67
Mark C

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Houston, TX - USA

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I might be inclined to give you more credit.
Dude... Your "credit" is meaninglies to me. Please feel free to keep it to yourself.

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03-03-2008 10:21 PM  10 years agoPost 68
AirWolfRC

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42½ N, 83½ W

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You think there is some downwash here?
Of course there is. Have you not heard of wake turbulance ? ?

I give up. You can lead a horse to water . . . . . . .

I'm glad you types are only kit builders and don't exercise any design input.

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03-03-2008 10:21 PM  10 years agoPost 69
Mark C

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Houston, TX - USA

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You think there is some downwash here?
Looking at that 2nd Photo.... Definately "yes"

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03-03-2008 10:22 PM  10 years agoPost 70
kangarooster

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Orlando Fl-USA

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It is hard to believe that out of 65 responses, only 3 had the right answer.

"The flat side goes down."

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03-03-2008 10:22 PM  10 years agoPost 71
hootowl

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Garnet Valley, Pa.

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It's the flaps I say

Wolves don't lose sleep over the opinions of sheep

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03-03-2008 10:23 PM  10 years agoPost 72
AirWolfRC

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42½ N, 83½ W

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Dude... Your "credit" is meaninglies to me.
You have made that abundantly clear. The only view you value is your own.

Too bad you have no history of design & build.

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03-03-2008 10:41 PM  10 years agoPost 73
Mark C

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Houston, TX - USA

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You have made that abundantly clear. The only view you value is your own.
Not really. As witnessed many times here I have valued and taken many views expressed on here. I've even listened to yours when it was on track and in a less pompous and argumentative tone. But that isn't today is it?

Besides, what the hell are upset for? You wanted and argument from the moment you followed my first post on here so I gave you one. You're one of those who would complain if we hung you with a brand new rope.
Too bad you have no history of design & build.
You have no clue on whether I'm a brain surgeon, an axe murderer or a cross-dressing Archbishop as do I know of your history or care to. So rather than embarrass yourself you should just try to keep your delusional comments in check.

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03-04-2008 12:11 AM  10 years agoPost 74
AirWolfRC

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42½ N, 83½ W

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I think talking about your history would be of much greater value than the bluster and hot air you have offered so far.

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03-04-2008 12:34 AM  10 years agoPost 75
Droid

rrElite Veteran

Deep down in the Southwest- UK

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bluster and hot air
Are those aerodynamic terms??

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03-04-2008 12:55 AM  10 years agoPost 76
Boidman (RIP)

rrKey Veteran

The Home Stretch

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Bluster:

A hominid generated mass of moving air, at standard temperature and pressure. There is always a detectable sour aroma that becomes identifiable as the moving front passes.

Hot Air:

Somewhat distinct from 'bluster', in that the 'stench' will usually rise to the ceiling and hang there long enough for the observant to escape.

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06-06-2012 10:52 PM  6 years agoPost 77
cessna151

rrVeteran

Missouri... Originally Indiana

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From the FAA's Pilot's Handbook of Aeronautical Knowledge...

"... both the development of low pressure above the wing [Bernoulli] and reaction to the force and direction of air as it is deflected from the wing's lower surface [Newton] contribute to the total lift generated."

See also The New York Times explanation.

--Eagles may soar high, but weasels don't get sucked into jet engines!--

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