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    <title>
      FDC help: Power (Beaver)
    </title>
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    <h2>
      Subsystem <i>Power (Beaver)</i>
    </h2>
    <p><i>Power (Beaver)</i> 
    computes the engine power and non-dimensional pressure increase across the
    propeller for the DHC-2 &#39;Beaver&#39; aircraft, using the engine power
    model from <a href="#References">ref.[1]</a>. <i>Power</i> is contained in the
    subsystem <i><a href="enggrp.htm">Engine Group</a></i> of the system <i><a
    href="beaver.htm">Beaver</a></i>. This subsystem also contains the blocks
    <i><a href="engmod.htm">Engmod (Beaver)</a></i> and <i><a href=
    "fmdims.htm">FMdims</a></i>.</p> 
    <h3>
      Inputvectors: <i>x</i>, <i>uprop</i>, <i>yatm</i>
    </h3>
<pre>
  x    = [V alpha beta p q r psi theta phi xe ye H]&#39;     (states)
  uprop= [n pz]&#39;                                  (engine inputs)
  yatm = [rho ps T mu g]&#39;   (atmospheric properties, computed in
                                               the block <a href=
"atmosph.htm">Atmosph</a>)

  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]                           }

  n    : engine speed [RPM]
  pz   : manifold pressure [&quot;Hg]

  rho  : air density [kg/m^3]
 {ps   : static pressure [N/m^2]                                }
 {T    : air temperature [K]                                    }
 {mu   : dynamic viscosity [kg/(m*s)]                           }
 {g    : acceleration of gravity [m/s^2]                        }
</pre>
    <p>Variables which are not actually used by <i>Power (Beaver)</i> have been
    displayed between curly braces.</p> 
    <h3>
      Outputvector: <i>ypow</i>
    </h3>
<pre>
  ypow = [dpt P]&#39;

  dpt  : dimensionless pressure increase across the propeller [-]
  P    : engine power [Nm/s]
</pre>
    <h3>
      <a name="References">References</a>
    </h3>
    <ol>
      <li>
        R.T.H. Tjee and J.A. Mulder. <i>Stability and Control Derivatives of
        the De Havilland DHC-2 &quot;Beaver&quot; aircraft</i>. Report LR-556,
        Delft University of Technology, 1988.
      </li>
    </ol>
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