"Nyal Williams" wrote in message
...
At 17:00 04 February 2005, Jim Vincent wrote:
Seems to me this picture is also inadequate. If the
aircraft is banked and a component of the lift is then
horizontal, why doesn't the aircraft just go sideways
over into the next county?

We need a good mental picture of what is happening
to cause the circling flight instead of just being
lifted sideways. We have to bring gravity, centrifugal
force, and the effect of the tail feathers into this
picture.

You need to remember that this is a 3D vector problem involving both
velocity vectors and acceleration vectors.

The math works out something like this:

Turn Radius = Velocity squared divided by 11.26 time the tangent of the bank
angle.
Velocity is in knots (TAS), bank angle is in degrees and turn radius is in
feet.

The full description of the problem and its' solution can be found on page
178 of the 1965 edition of "Aerodynamics for Naval Aviators."

Respectfully,

Wayne
http://www.soaridaho.com/Schreder