Re: spins from coordinated flight

Jose wrote:
>> 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.

Yaw, as we define the term in flight test as it relates to directional 
stability is defined as moments about the VERTICAL axis, not the 
longitudinal axis. These moments also relate to Yaw Angle, Yaw Rate, and 
Sideslip Angle.


-- 
Dudley Henriques