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      FDC help: Cwind
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    <h2>
      Subsystem <i>Cwind</i>: constant wind
    </h2>
    <p><i>Cwind</i> is a masked Simulink system, which is used to calculate
    velocity components along the body-axes of
    the aircraft, assuming a constant wind speed and direction. If you want the wind velocity and/or direction to vary with altitude, use <i><a href="blwind.htm">BLwind</a></i> instead. Both <i>Cwind</i> and <i>BLwind</i> are contained in the blocklibrary <i><a href="windlib.htm">WINDLIB</a></i>.</p>
     <p>The user must specify the wind velocity <i>V<sub>w</sub></i> in [m/s], the horizontal wind direction <i>psi_w</sub></i> in [rad], and the vertical wind direction <i>gamma_w</i>, also in [rad]. Notice that <i>psi_w</i> should be equal to <i>pi</i> rad if the wind is blowing <i>to</i> the North and that <i>gamma_w</i> is positive for upward blowing wind!
    <h3>
      Inputvector: <i>x</i>
    </h3>
<pre>
  x = [V alpha beta p q r psi theta phi xe ye H]&#39;        (states)

 {V    : airspeed [m/s]                                         }
 {alpha: angle of attack [rad]                                  }
 {beta : sideslip angle [rad]                                   }
 {p    : roll rate [rad/s]                                      }
 {q    : pitch rate [rad/s]                                     }
 {r    : yaw rate [rad/s]                                       }
  psi  : yaw angle [rad]                                        
  theta: pitch angle [rad]                                      
  phi  : roll angle [rad]                                       
 {xe   : x-coordinate in Earth-fixed reference frame [m]        }
 {ye   : y-coordinate &#39;&#39;     &#39;&#39;          &#39;&#39;      &#39;&#39;  [m]        }
 {H    : altitude above sea-level [m]                           }
</pre>
    <p>The variables which are not actually used by <i>Cwind</i> have been
    displayed between curly braces.</p>
    <h3>
      Outputvector: <i>ywind</i>
    </h3>
<pre>
  ywind = [uw vw ww]&#39;

  uw   : wind velocity component along XB-axis [m/s]
  vw   : wind velocity component along YB-axis [m/s]
  ww   : wind velocity component along ZB-axis [m/s]
</pre>
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