The Impossibility of Flying Heavy Aircraft Without Training

Richard Lamb wrote:
David CL Francis wrote:

On Fri, 3 Mar 2006 at 02:27:02 in message
. net, Richard Lamb
wrote:

I hate to be a spoil sport (or dullard?), but...

the (stationary) air does WHAT (as the wing passes by)???



The nature of things is such that the situation does not change if you
change the frame of reference. It is normal in doing calculations to
start with a frame of reference based on the aircraft. If you follow
the aircraft then the air is going past it.

The presence of the wing changes the air flowing past the aircraft in
the same way as if you consider the aircraft passing through the air.
The 'stationary' air as you call it has its local velocity and
direction changed by the aircraft.


Yeahbut...

A handy frame of reference is - handy.

But it can be very misleading.....


For instance?

If the air is moving, we expect a lower pressure. Nod to Bernoulli.

But the air would also be moving along the bottom side of the wing also?

And what would that do to the pressure under the wing?

And if the pressure under the wing is below ambient....