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Aerodynamic_Device.h

//  Aerodynamic_Device.h - a particle that produces drag and lift.
//
//  Copyright (C) 2002 Sam Varner
//
//  This file is part of Vamos Automotive Simulator.
//
//  This program is free software; you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation; either version 2 of the License, or
//  (at your option) any later version.
//
//  This program is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with this program; if not, write to the Free Software
//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

#ifndef _AERODYNAMIC_DEVICE_H_
#define _AERODYNAMIC_DEVICE_H_

#include <vamos/body/Particle.h>
#include <vamos/geometry/Three_Vector.h>

namespace Vamos_Body
{
  //* An Aerodynamic_Device is a particle that may produce drag or lift.
  class Aerodynamic_Device : public Particle
  {
  protected:
      // The current wind velocity vector.
      Vamos_Geometry::Three_Vector m_wind_vector;

      // The current air density.
      double m_density;

  public:
      //** Constructor
      Aerodynamic_Device (const Vamos_Geometry::Three_Vector& position);

      // Calculate the drag and lift due to WIND_VECTOR.  WIND_VECTOR is
      // supplied by the Body in the Body's frame.  DENSITY is the denisty
      // of the atmosphere.
      void wind (const Vamos_Geometry::Three_Vector& wind_vector, 
                     double density);

      // Find and store the forces, impulses, and torques for the
      // current configuration.
      virtual void find_forces () = 0;
  };

  //* An Aerodynamic_Device that produces drag.
  class Drag : public Aerodynamic_Device
  {
  protected:
      // The frontal area of the particle.
      double m_frontal_area;

      // The coefficient of drag.
      double m_drag_coefficient;

  public:
      //** Constructor
      Drag (const Vamos_Geometry::Three_Vector& position,
              double frontal_area, double drag_coefficient);

      // Find and store the forces, impulses, and torques for the
      // current configuration.
      virtual void find_forces ();
  };

  class Wing : public Drag
  {
      // The area of the surface of the wing.
      double m_surface_area;

      // The coefficient of lift.
      double m_lift_coefficient;

      // The efficiency of the wing (< 1.0, > 0).
      double m_efficiency;

  public:
      //** Constructor
      Wing (const Vamos_Geometry::Three_Vector& position,
              double frontal_area, double drag_coefficient,
              double surface_area, double lift_coefficient,
              double efficiency);

      // Find and store the forces, impulses, and torques for the
      // current configuration.
      void find_forces ();
  };
}

#endif // !_AERODYNAMIC_DEVICE_H_

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