Re: spins from coordinated flight

Jose wrote:
>> To define turn using axis reference is not the best way to explain 
>> turn since once established in a stable turn there should be no 
>> movement on the airplane's axis system.
> 
> I am not sure I'm getting this.
> 
> We'll ignore translation (straight line motion).
> 
> The axis system is (as I have been using it) fixed to the aircraft, and 
> the axis system moves whenever the aircraft rotates (around any point). 

> It has nothing to do with the actual earth's horizon. 
> Then, as I understand it, rotation of the aircraft involves a rotation 
> around one or more of the axes.  Yaw involves rotation (=of= the 
> longitudinal axis, and thus the airplane) =about= the (airplane) 
> vertical axis, =in= the plane (roughly described by the wing tips and 
> tail) of the (airplane) horizontal axes.
> 
> In a turn, slipping, skidding, or coordinated, the nose of the airplane 
> (dragging the longitudinal axis with it) is changing its direction.  The

> airplane is changing heading.  If this happens at a constant rate (say, 
> 3 degrees per second), I would say the aircraft is yawing at a steady 
> angular velocity, and undergoing no acceleration in yaw.  To =enter= or 
> =leave= this state would require an =acceleration= of yaw in one 
> direction or another.
> 
> Where do our understandings and vocabulary diverge?
> 
> Jose
Jose;
Do some research on the aircraft axis system and what each axis 
represents, then research forces in turns. It should become clearer then.
Thank you


-- 
Dudley Henriques