Backwash Causes Lift?

Le Chaud Lapin writes:

"the molecules stay in contact with the solid body"...?????????????

Why?

Supposedly this is the Coanda effect at work, but there remains considerable
debate about this.

Bertie the Bunyip writes:

Yes, they can, and do.

Which ones? How do you accelerate an aircraft without accelerating anything
downward?

"Jim Logajan" wrote

Grumble. Now I recall why I had established a personal policy to stay away
from discussions of aerodynamics on this newsgroup: futility avoidance.

No, you need to stay away from discussions with MX, or Le chad, or
flightoffancy, who are all one and the same.

ANY discussion with them is an exercise in futility.

Just say no.
--
Jim in NC

Mxsmanic wrote in
:

Le Chaud Lapin writes:

"the molecules stay in contact with the solid body"...?????????????

Why?

Supposedly this is the Coanda effect at work, but there remains
considerable debate about this.



Only amongst k00ks.


bertie

Bertie the Bunyip wrote:
"Gig 601XL Builder" wrDOTgiaconaATsuddenlink.net wrote in
:

How does a gyrocopter fly because the airflow over it's "wing" is
going up.




They're gliders. The same rules apply.


Bertie

I agree the same rules apply, but they aren't gliders unless the
engine craps out.

--
Jim Pennino

Remove .spam.sux to reply.

Mxsmanic wrote in
:

Bertie the Bunyip writes:

Yes, they can, and do.

Which ones? How do you accelerate an aircraft without accelerating
anything downward?


Send me 1,000 bucks and I'll tell you. Otherwise go find out yourself
fruitcake.


Bertie

wrote in :

Bertie the Bunyip wrote:
"Gig 601XL Builder" wrDOTgiaconaATsuddenlink.net wrote in
:

How does a gyrocopter fly because the airflow over it's "wing" is
going up.




They're gliders. The same rules apply.


Bertie

I agree the same rules apply, but they aren't gliders unless the
engine craps out.


Fair enough, but the wing is behaving in exactly the same way.

Bertie

On Oct 8, 11:46 am, Mxsmanic wrote:
Le Chaud Lapin writes:
"the molecules stay in contact with the solid body"...?????????????

Why?

Supposedly this is the Coanda effect at work, but there remains considerable
debate about this.

There isn't any debate about what a wing stall is, and what causes
it. It has been well-explored in wind tunnel testing. The phenomenon
of wing stall is real-world evidence that the top surface of the wing
is a large contributor to lift. The Bernoulli effect and the
associated Coanda effect are well-understood scientific phenomena.
They explain how the curved top surface of the wing displaces air
downward. Unless someone can come up with a better explanation for
the fact that wing stall destroys lift, I think the only debate is by
people who are determined to ignore the scientific evidence.

Phil

Mxsmanic wrote:
Bertie the Bunyip writes:

Yes, they can, and do.

Which ones? How do you accelerate an aircraft without accelerating anything
downward?

Acceleration is the second derivative of position.

If the vertical postion of an aircraft is constant, i.e. straight and
level flight, the first derivative of the vertical position is zero and
hence the second derivative is also zero.

Acceleration is the first derivative of velocity.

If the horizontal velocity of an aircraft is constant, i.e. straight and
level flight, the deriviative of the velocity is zero.

An aircraft in straight and level flight is not accelerated.


--
Jim Pennino

Remove .spam.sux to reply.

wrote:
Mxsmanic wrote:
How do you accelerate an aircraft without accelerating
anything downward?
[ ... ]
An aircraft in straight and level flight is not accelerated.

Cute - classic Usenet response. Simultaneously correct, but not really
addressing the original issue.