Newton explains it better than Bernoulli. The FAA
written for PSEL no longer requires the Bernoulli answer
about lift.

Go to Amazon.com or Bookfinder.com and look for a book
by Gale Craig, titled, 'Stop Abusing Bernoulli! - How
Airplanes Really Fly '. (Search under Craig, Gale.)
Gale is a physicist who enquired into this subject.
Used copies are listed there, but the book is self-published
and you can order fresh copies from him. He lives
in Anderson, Indiana. Anyone who is interested in
that address should write me and I will get it for
you.

At 17:00 09 January 2006, Marty wrote:

Stick the cambered side of a standard spoon under a
running tap! Ease
the cambered side of the spoon gradually into the running
water until
the flow �sucks� the spoon into the flow. The faster
the flow of water
from the tap, the more 'lift'� and the slower the
flow the less 'lift'.
You can demo the stall by reducing the flow of water
until the spoon
fails to sustain flight!!

If you want to look like more of an idiot, blow on
the back of the
spoon whilst it's in the flow of water. It effectively
demonstrates a
few principles of fluid dynamics� even if it isn't
as scientifically
correct as it should be. You students won�t forget
the demo.

OK, what is the better explanation to give fledgling
students.

What's wrong with explaining both? There�s a lot
of aerodynamics that
requires a fairly comprehensive knowledge of both principles?


Yes, you do have pressure differences, but that is
just an artifact of
the process.

I'm not sure if I understand that sentence. Explaining
'deflection of
air' alone without reference to pressure differential
essentially means
that the many reasons for a cambered wing are essentially
ignored.
Explain reasons why some wings are heavily cambered
and why some are
not and it qualifies your explanation.

What about a Bernoulli view of SR-71 flight ops as
it climbs from
sea-level to 85,000 feet.

My point exactly. What about a SFTOL aircraft as an
example of the
opposite end of the performance spectrum? Compare wings
(L/D, span,
chord, etc) and compare power/thrust/weight ratios.
An example of an
all-in-one wing might be an airliner with slats, slots,
spoilers, and
flaps etc that effectively create a new wing for a
different purpose in
different phases of flight.


--
Marty
Posted at www.flight.org