In article orfairbairn-5EFA92.14080822052011@70-3-168-
216.pools.spcsdns.net, , Orval Fairbairn
says...

In article ,
Dave Doe wrote:

Does anyone have any figures and references for about what ratio lift is
produced by Newton's Laws and Bernoulli's Laws?

I appreciate this is not a static figure - but say a yer average C-172,
or perhaps a 737.

I would hazard a semi-educated guess that lift is *primarily* produced
by angle of attack (or deflection if you like) - Newton's Laws - and by
a much lesser degree by Bernoulli's Law. I would guess that Bernoulli's
principle might create 20% of the lift a wing generates. A friend
believes it would be much lesser - about 5%.

Newton and Bernoulli approach the idea of lift generation from two
different perspectives -- both correct.

Newton's laws explain lift as an exchange of energy and momentum -- a
craft flying through the air imparts some of its momentum to the
vertical axis, which manifests itself as "lift."

Bernoulli explains the fluid mechanics of lift generation via pressure
distribution, to create "lift."

Newton explains why we get a downdraft as a plane flies overhead.

Thanks for the reply - looking for numbers, not the physics behind it.
IE looking for the percentage of lift obtained by each - and as I said,
although this is variable dependent no doubt on the plane and the
airspeed - just trying to get a rough idea (hence, say a C-172 or a
737).


--
Duncan.