Re: spins from coordinated flight

> A "normal" turn is accomplished by splitting the lift vector, NOT by
holding in yaw. Yaw should only be present in the turn dynamic during the
entry into the turn and exit from the turn.

Ok, then what exactly is "yaw"?  My understanding is that it is a change
of direction of the longitudinal axis of the aircraft in the plane that is
roughly coplanar with the wings.

Splitting the lift vector serves to change the direction of flight, but
not to change the heading.  To do that you need what I was calling yaw,
and if you want to stay in a coordinated turn, you need to continually
change the heading as you continually change the direction of flight.  You
would have a steady change in heading (which will include a steady yaw)
with no acceleration in the yaw direction.

You seem to be defining yaw as a rotational =acceleration= of the
longitudinal axis of the aircraft in the plane that is roughly coplanar
with the wings.

Do I have that right?

Jose 
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