Mike, I've always thought that the wind hitting the bottom of the wing
is what keeps it up, but I have to think twice about the airfoil
concept, due to the fact that if you blow over the top of a curved paper
sheet, the sheet will rise and there is no air going under the sheet to
force it up
On 4/22/2019 8:36 PM, Mike Stirewalt via KRnet wrote:
Larry posted,
https://phys.org/news/2012-01-wings.html
I'd bet the guys who solicited the grant money for this graduate student
project havent the slightest idea how to actually fly an airplane. In
the real world, Darwinian selection doesn't favor these types. If they
do decide to learn to fly a plane, they're invariably the ones that end
up dead or sitting in a Cirrus that's hanging from a tree by its
parachute.
I enjoyed their demonstration regarding the sailboat sail. Sailing is a
type of flying.
I'm not questioning anything regarding your airmanship Larry so don't get
annoyed. My point, an important one on a forum where quite a few retired
guys are building and learning to fly airplanes for the first time . . .
I feel it's worth making the point that someone learning the fundamental
concepts as Langsewische presents them gives those who grasps these
practicalities an advantage over those who don't.
I personally have met and become familiar with at least two excellent
builders who should have never been signed off for solo, much less given
an airman certificate. If I were to go back in time and think about it,
there have been many more. I don't doubt you've known some of these
fellows yourself. These folks have all, with rare exception, ended up
suffering disasters of different types.
Snippets from Stick & Rudder (with minor edits by me)
The wing keeps the airplane up by pushing the air down.
Blackboard aerodynamiscists neglect those phases of flight that most
interest the pilot and are of more practical use.. Langscwiche uses
practicalities, things that can be clearly experienced and witnessed.
Theory is no help when a locked and frozen mind is staring at un
unwinding altimiter and has nothing to fall back on but checklists and
useless simulator practice sessions.
Theory fails to show the pilot the most important fact in the art of
piloting—the Angle of Attack, and how it changes in flight.
Angle of Attack is in a way the theory of flight. It is almost literally
all there is to flight. If a wing has no Angle of Attack, it will not
wash the air down; and if it did not wash the air down, there would be no
lift.
Forget Bernoulli’s Theorem. In exerting a downward force upon the air,
the wing receives an upward counterforce—Newton’s law of action and
reaction.
A wing is in the last analysis is nothing but an air deflector. It is an
inclined plane, cleverly curved, to be sure, and elaborately streamlined,
but still essentially an inclined plane. This plane is inclined so that
as it moves through the air, it will meet the air at an angle and thus
shove it downward. This is why a jet airliner flies decidedly nose-up at
high cruise altitudes: to deflect the thin air downward. This is why you
can stick your arm out your car window and "fly" your hand.
Of course in fine tuning an air deflector (wing), adding curvature to the
top surface promotes some degree of lift and influences the way the wing
handles in the air. Bernoulli wasn't wrong, he was just insufficient.
Mike
KSEE
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