Opinions on NASA lift theory?

Interesting read...

https://www.grc.nasa.gov/www/K-12/airplane/wrong1.html

On Sunday, July 1, 2018 at 9:08:44 AM UTC-5, Matt Herron Jr. wrote:
Interesting read...

https://www.grc.nasa.gov/www/K-12/airplane/wrong1.html

Try "Stick and Rudder", by Langeweische.

But, of course flight is really just witchcraft ;-)

Scott

The previous webpage offers the correct mechanism:

https://www.grc.nasa.gov/www/K-12/airplane/right2.html

Note that in: F = m * dV/dt

F and V are vectors with components in 3 dimensions. Of course the z-axis is of most interest. Drag and vortex effects manifest themselves principally in the x and y axes.

And yes, there's a vast amount of mythology on lift generation in most pilot textbooks.

On Sunday, July 1, 2018 at 11:17:23 AM UTC-4, George Haeh wrote:
The previous webpage offers the correct mechanism:

https://www.grc.nasa.gov/www/K-12/airplane/right2.html

Note that in: F = m * dV/dt

F and V are vectors with components in 3 dimensions. Of course the z-axis is of most interest. Drag and vortex effects manifest themselves principally in the x and y axes.

And yes, there's a vast amount of mythology on lift generation in most pilot textbooks.

All of the several valid theories of lift are simply mathematical models, not the reality itself. The Bernoulli mechanism does in fact generate lift, but does not explain or predict it well, so it is best discarded as less than the whole picture. There's lifting line theory, circulation theory, deflection theory - no shortage of models.

A wing deflects air downwards, and the upward force is applied to the wing via Bernoulli pressure distributions.
If you disagree, tell me where the reaction force is applied and how.
Every airfoil has a known pressure distribution, as this is the way airfoils are designed.
Simple, well known science.
Why the constant attempts at mumbo jumbo theories exist is a total mystery to me.

https://www.mh-aerotools.de/airfoils...tributions.htm

Nah, it's due to lift demons:
http://messybeast.com/dragonqueen/liftdemon.htm
(Author thanks Mary Shafer, NASA-Dryden (now NASA-Armstrong) for revealing the truth)

On Sunday, July 1, 2018 at 9:08:44 AM UTC-5, Matt Herron Jr. wrote:
Interesting read...

https://www.grc.nasa.gov/www/K-12/airplane/wrong1.html

I've also heard that it is the impact of ascending angels on the lower surface of the airframe, but they take breaks sometimes to pray, usually along with the pilot :-)

On Mon, 02 Jul 2018 06:42:46 -0700, Scott Williams wrote:

On Sunday, July 1, 2018 at 9:08:44 AM UTC-5, Matt Herron Jr. wrote:
Interesting read...

https://www.grc.nasa.gov/www/K-12/airplane/wrong1.html

I've also heard that it is the impact of ascending angels on the lower
surface of the airframe, but they take breaks sometimes to pray, usually
along with the pilot :-)

A similar theory about how competition free flight model aircraft was
around several years ago, only instead of demons, its creatures were
small, fat, furry Bernoulli Balls. Like the demons, these hold onto
models wings to support them when they are flying and won't go near a
really ugly model.

However, they are also responsible for thermals, which occur when crowds
of Bernoulli Balls dance around because they are warm, happy and excited.
Models that enter a thermal are grabbed and included in the dance. This
also explains why there are no thermals at night - the BBs are all
sitting on the ground, worn out by their day's activities.


--
Martin | martin at
Gregorie | gregorie dot org

So how does all of this (lift demons, CDU, etc.) explain the fact that
British aeroplanes [sic] also fly?Â* They make some of the ugliest planes
in the world, except for the Spitfire, there must have been a Frenchman,
an Italian, or an American involved in that design.

God bless the Queen!

On 7/2/2018 8:39 AM, Martin Gregorie wrote:
On Mon, 02 Jul 2018 06:42:46 -0700, Scott Williams wrote:

On Sunday, July 1, 2018 at 9:08:44 AM UTC-5, Matt Herron Jr. wrote:
Interesting read...

https://www.grc.nasa.gov/www/K-12/airplane/wrong1.html
I've also heard that it is the impact of ascending angels on the lower
surface of the airframe, but they take breaks sometimes to pray, usually
along with the pilot :-)
A similar theory about how competition free flight model aircraft was
around several years ago, only instead of demons, its creatures were
small, fat, furry Bernoulli Balls. Like the demons, these hold onto
models wings to support them when they are flying and won't go near a
really ugly model.

However, they are also responsible for thermals, which occur when crowds
of Bernoulli Balls dance around because they are warm, happy and excited.
Models that enter a thermal are grabbed and included in the dance. This
also explains why there are no thermals at night - the BBs are all
sitting on the ground, worn out by their day's activities.



--
Dan, 5J