X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FFDM%2Fflight.cxx;h=ed670fa8b81e4a80b7c620367c9be06e2456466e;hb=f0e6716953604730579a5e45f785fd063737dce4;hp=6bb94eec497e1da231609de1d0e3d4a798911151;hpb=32bab8aa1063b836ee955ffc0b308a46427f5289;p=flightgear.git

diff --git a/src/FDM/flight.cxx b/src/FDM/flight.cxx
index 6bb94eec4..ed670fa8b 100644
--- a/src/FDM/flight.cxx
+++ b/src/FDM/flight.cxx
@@ -1,4 +1,4 @@
-// flight.c -- a general interface to the various flight models
+// flight.cxx -- a general interface to the various flight models
 //
 // Written by Curtis Olson, started May 1997.
 //
@@ -23,17 +23,23 @@
 
 #include <stdio.h>
 
-#include <Debug/logstream.hxx>
-#include <FDM/External/external.hxx>
+#include <plib/sg.h>
+
+#include <simgear/constants.h>
+#include <simgear/debug/logstream.hxx>
+#include <simgear/math/sg_geodesy.hxx>
+#include <simgear/timing/timestamp.hxx>
+
+#include <Scenery/scenery.hxx>
 #include <FDM/LaRCsim/ls_interface.h>
-#include <Include/fg_constants.h>
-#include <Main/options.hxx>
-#include <Math/fg_geodesy.hxx>
-#include <Time/timestamp.hxx>
+#include <Main/globals.hxx>
+#include <Main/fg_props.hxx>
 
+#include "External.hxx"
 #include "flight.hxx"
-#include "JSBsim.hxx"
+#include "JSBSim.hxx"
 #include "LaRCsim.hxx"
+#include "Balloon.h"
 
 
 // base_fdm_state is the internal state that is updated in integer
@@ -41,9 +47,566 @@
 // world time, so we introduce cur_fdm_state which is extrapolated by
 // the difference between sim time and real world time
 
-FGInterface cur_fdm_state;
+FGInterface *cur_fdm_state;
 FGInterface base_fdm_state;
 
+inline void init_vec(FG_VECTOR_3 vec) {
+    vec[0] = 0.0; vec[1] = 0.0; vec[2] = 0.0;
+}
+
+FGEngInterface::FGEngInterface() {
+
+    // inputs
+    Throttle=0;
+    Mixture=0;
+    Prop_Advance=0;
+
+    // outputs
+    RPM=0;
+    Manifold_Pressure=0;
+    MaxHP=0;
+    Percentage_Power=0;
+    EGT=0;
+    prop_thrust=0;
+}
+
+FGEngInterface::~FGEngInterface(void) {
+}
+
+FGGearInterface::FGGearInterface(void) {
+    x=y=z=0.0;
+    brake=rolls=WoW=false;
+    position=1.0;
+}
+
+FGGearInterface::~FGGearInterface() {
+}
+
+// Constructor
+FGInterface::FGInterface() {
+    _setup();
+}
+
+FGInterface::FGInterface( double dt ) {
+    _setup();
+    delta_t = dt;
+    remainder = elapsed = multi_loop = 0;
+}
+
+// Destructor
+FGInterface::~FGInterface() {
+    // unbind();                   // FIXME: should be called explicitly
+}
+
+
+/**
+ * Set default values for the state of the FDM.
+ *
+ * This method is invoked by the constructors.
+ */
+void
+FGInterface::_setup ()
+{
+    inited = false;
+    bound = false;
+
+    init_vec( d_pilot_rp_body_v );
+    init_vec( d_cg_rp_body_v );
+    init_vec( f_body_total_v );
+    init_vec( f_local_total_v );
+    init_vec( f_aero_v );
+    init_vec( f_engine_v );
+    init_vec( f_gear_v );
+    init_vec( m_total_rp_v );
+    init_vec( m_total_cg_v );
+    init_vec( m_aero_v );
+    init_vec( m_engine_v );
+    init_vec( m_gear_v );
+    init_vec( v_dot_local_v );
+    init_vec( v_dot_body_v );
+    init_vec( a_cg_body_v );
+    init_vec( a_pilot_body_v );
+    init_vec( n_cg_body_v );
+    init_vec( n_pilot_body_v );
+    init_vec( omega_dot_body_v );
+    init_vec( v_local_v );
+    init_vec( v_local_rel_ground_v );
+    init_vec( v_local_airmass_v );
+    init_vec( v_local_rel_airmass_v );
+    init_vec( v_local_gust_v );
+    init_vec( v_wind_body_v );
+    init_vec( omega_body_v );
+    init_vec( omega_local_v );
+    init_vec( omega_total_v );
+    init_vec( euler_rates_v );
+    init_vec( geocentric_rates_v );
+    init_vec( geocentric_position_v );
+    init_vec( geodetic_position_v );
+    init_vec( euler_angles_v );
+    init_vec( d_cg_rwy_local_v );
+    init_vec( d_cg_rwy_rwy_v );
+    init_vec( d_pilot_rwy_local_v );
+    init_vec( d_pilot_rwy_rwy_v );
+    init_vec( t_local_to_body_m[0] );
+    init_vec( t_local_to_body_m[1] );
+    init_vec( t_local_to_body_m[2] );
+
+    mass=i_xx=i_yy=i_zz=i_xz=0;
+    nlf=0;
+    v_rel_wind=v_true_kts=v_rel_ground=v_inertial=0;
+    v_ground_speed=v_equiv=v_equiv_kts=0;
+    v_calibrated=v_calibrated_kts=0;
+    gravity=0;
+    centrifugal_relief=0;
+    alpha=beta=alpha_dot=beta_dot=0;
+    cos_alpha=sin_alpha=cos_beta=sin_beta=0;
+    cos_phi=sin_phi=cos_theta=sin_theta=cos_psi=sin_psi=0;
+    gamma_vert_rad=gamma_horiz_rad=0;
+    sigma=density=v_sound=mach_number=0;
+    static_pressure=total_pressure=impact_pressure=0;
+    dynamic_pressure=0;
+    static_temperature=total_temperature=0;
+    sea_level_radius=earth_position_angle=0;
+    runway_altitude=runway_latitude=runway_longitude=0;
+    runway_heading=0;
+    radius_to_rwy=0;
+    climb_rate=0;
+    sin_lat_geocentric=cos_lat_geocentric=0;
+    sin_latitude=cos_latitude=0;
+    sin_longitude=cos_longitude=0;
+    altitude_agl=0;
+}
+
+void
+FGInterface::init () {}
+
+/**
+ * Initialize the state of the FDM.
+ *
+ * Subclasses of FGInterface may do their own, additional initialization,
+ * but there is some that is common to all.  Normally, they should call
+ * this before they begin their own init to make sure the basic structures
+ * are set up properly.
+ */
+void
+FGInterface::common_init ()
+{
+    SG_LOG( SG_FLIGHT, SG_INFO, "Start common FDM init" );
+
+    set_inited( true );
+
+    stamp();
+    set_remainder( 0 );
+
+    // Set initial position
+    SG_LOG( SG_FLIGHT, SG_INFO, "...initializing position..." );
+    set_Longitude( fgGetDouble("/position/longitude-deg")
+                   * SGD_DEGREES_TO_RADIANS );
+    set_Latitude( fgGetDouble("/position/latitude-deg")
+                  * SGD_DEGREES_TO_RADIANS );
+    double ground_elev_m = scenery.get_cur_elev();
+    double ground_elev_ft = ground_elev_m * SG_METER_TO_FEET;
+    if ( fgGetBool("/sim/startup/onground")
+         || fgGetDouble("/position/altitude-ft") < ground_elev_ft ) {
+        fgSetDouble("/position/altitude-ft", ground_elev_ft);
+    }
+    set_Altitude( fgGetDouble("/position/altitude-ft") );
+
+    // Set ground elevation
+    SG_LOG( SG_FLIGHT, SG_INFO,
+            "...initializing ground elevation to " << ground_elev_ft
+            << "ft..." );
+    SG_LOG( SG_FLIGHT, SG_INFO, "common_init(): set ground elevation "
+            << ground_elev_ft );
+    base_fdm_state.set_Runway_altitude( ground_elev_ft );
+    set_Runway_altitude( ground_elev_ft );
+
+    // Set sea-level radius
+    SG_LOG( SG_FLIGHT, SG_INFO, "...initializing sea-level radius..." );
+    SG_LOG( SG_FLIGHT, SG_INFO, " lat = "
+            << fgGetDouble("/position/latitude-deg")
+            << " alt = " << fgGetDouble("/position/altitude-ft") );
+    double sea_level_radius_meters;
+    double lat_geoc;
+    sgGeodToGeoc( fgGetDouble("/position/latitude-deg")
+                    * SGD_DEGREES_TO_RADIANS,
+                  fgGetDouble("/position/altitude-ft") * SG_FEET_TO_METER,
+                  &sea_level_radius_meters, &lat_geoc );
+    set_Sea_level_radius( sea_level_radius_meters * SG_METER_TO_FEET );
+
+    // Set initial velocities
+    SG_LOG( SG_FLIGHT, SG_INFO, "...initializing velocities..." );
+    if ( !fgHasNode("/sim/startup/speed-set") ) {
+        set_V_calibrated_kts(0.0);
+    } else {
+        const string speedset = fgGetString("/sim/startup/speed-set");
+        if ( speedset == "knots" || speedset == "KNOTS" ) {
+            set_V_calibrated_kts( fgGetDouble("/velocities/airspeed-kt") );
+        } else if ( speedset == "mach" || speedset == "MACH" ) {
+            set_Mach_number( fgGetDouble("/velocities/mach") );
+        } else if ( speedset == "UVW" || speedset == "uvw" ) {
+            set_Velocities_Wind_Body(
+                                     fgGetDouble("/velocities/uBody-fps"),
+                                     fgGetDouble("/velocities/vBody-fps"),
+                                     fgGetDouble("/velocities/wBody-fps") );
+        } else if ( speedset == "NED" || speedset == "ned" ) {
+            set_Velocities_Local(
+                                 fgGetDouble("/velocities/speed-north-fps"),
+                                 fgGetDouble("/velocities/speed-east-fps"),
+                                 fgGetDouble("/velocities/speed-down-fps") );
+        } else {
+            SG_LOG( SG_FLIGHT, SG_ALERT,
+                    "Unrecognized value for /sim/startup/speed-set: "
+                    << speedset);
+            set_V_calibrated_kts( 0.0 );
+        }
+    }
+
+    // Set initial Euler angles
+    SG_LOG( SG_FLIGHT, SG_INFO, "...initializing Euler angles..." );
+    set_Euler_Angles( fgGetDouble("/orientation/roll-deg")
+                        * SGD_DEGREES_TO_RADIANS,
+                      fgGetDouble("/orientation/pitch-deg")
+                        * SGD_DEGREES_TO_RADIANS,
+                      fgGetDouble("/orientation/heading-deg")
+                        * SGD_DEGREES_TO_RADIANS );
+
+    SG_LOG( SG_FLIGHT, SG_INFO, "End common FDM init" );
+}
+
+
+/**
+ * Bind getters and setters to properties.
+ *
+ * The bind() method will be invoked after init().  Note that unlike
+ * the usual implementations of FGSubsystem::bind(), this method does
+ * not automatically pick up existing values for the properties at
+ * bind time; instead, all values are set explicitly in the init()
+ * method.
+ */
+void
+FGInterface::bind ()
+{
+  bound = true;
+
+                                // Time management (read-only)
+  fgTie("/fdm/time/delta_t", this,
+        &FGInterface::get_delta_t); // read-only
+  fgTie("/fdm/time/elapsed", this,
+        &FGInterface::get_elapsed); // read-only
+  fgTie("/fdm/time/remainder", this,
+        &FGInterface::get_remainder); // read-only
+  fgTie("/fdm/time/multi_loop", this,
+        &FGInterface::get_multi_loop); // read-only
+
+			// Aircraft position
+  fgTie("/position/latitude-deg", this,
+        &FGInterface::get_Latitude_deg,
+        &FGInterface::set_Latitude_deg,
+        false);
+  fgSetArchivable("/position/latitude-deg");
+  fgTie("/position/longitude-deg", this,
+        &FGInterface::get_Longitude_deg,
+        &FGInterface::set_Longitude_deg,
+        false);
+  fgSetArchivable("/position/longitude-deg");
+  fgTie("/position/altitude-ft", this,
+        &FGInterface::get_Altitude,
+        &FGInterface::set_Altitude,
+        false);
+  fgSetArchivable("/position/altitude-ft");
+  fgTie("/position/altitude-agl-ft", this,
+        &FGInterface::get_Altitude_AGL); // read-only
+
+				// Orientation
+  fgTie("/orientation/roll-deg", this,
+	&FGInterface::get_Phi_deg,
+	&FGInterface::set_Phi_deg);
+  fgSetArchivable("/orientation/roll-deg");
+  fgTie("/orientation/pitch-deg", this,
+	&FGInterface::get_Theta_deg,
+	&FGInterface::set_Theta_deg);
+  fgSetArchivable("/orientation/pitch-deg");
+  fgTie("/orientation/heading-deg", this,
+	&FGInterface::get_Psi_deg,
+	&FGInterface::set_Psi_deg);
+  fgSetArchivable("/orientation/heading-deg");
+
+				// Calibrated airspeed
+  fgTie("/velocities/airspeed-kt", this,
+	&FGInterface::get_V_calibrated_kts,
+	&FGInterface::set_V_calibrated_kts,
+	false);
+
+				// Local velocities
+//   fgTie("/velocities/speed-north-fps", this,
+// 	&FGInterface::get_V_north,
+// 	&FGInterface::set_V_north);
+//   fgSetArchivable("/velocities/speed-north-fps");
+//   fgTie("/velocities/speed-east-fps", this,
+// 	&FGInterface::get_V_east,
+// 	&FGInterface::set_V_east);
+//   fgSetArchivable("/velocities/speed-east-fps");
+//   fgTie("/velocities/speed-down-fps", this,
+// 	&FGInterface::get_V_down,
+// 	&FGInterface::set_V_down);
+//   fgSetArchivable("/velocities/speed-down-fps");
+				// FIXME: Temporarily read-only, until the
+				// incompatibilities between JSBSim and
+				// LaRCSim are fixed (LaRCSim adds the
+				// earth's rotation to the east velocity).
+  fgTie("/velocities/speed-north-fps", this,
+	&FGInterface::get_V_north);
+  fgTie("/velocities/speed-east-fps", this,
+	&FGInterface::get_V_east);
+  fgTie("/velocities/speed-down-fps", this,
+	&FGInterface::get_V_down);
+
+				// Relative wind
+				// FIXME: temporarily archivable, until
+				// the NED problem is fixed.
+  fgTie("/velocities/uBody-fps", this,
+	&FGInterface::get_uBody,
+	&FGInterface::set_uBody,
+	false);
+  fgSetArchivable("/velocities/uBody-fps");
+  fgTie("/velocities/vBody-fps", this,
+	&FGInterface::get_vBody,
+	&FGInterface::set_vBody,
+	false);
+  fgSetArchivable("/velocities/vBody-fps");
+  fgTie("/velocities/wBody-fps", this,
+	&FGInterface::get_wBody,
+	&FGInterface::set_wBody,
+	false);
+  fgSetArchivable("/velocities/wBody-fps");
+
+				// Climb and slip (read-only)
+  fgTie("/velocities/vertical-speed-fps", this,
+	&FGInterface::get_Climb_Rate); // read-only
+  fgTie("/velocities/side-slip-rad", this,
+	&FGInterface::get_Beta); // read-only
+
+				// Powerplant
+  for (int i = 0; i < get_num_engines(); i++) {
+    char buf[64];
+
+    sprintf(buf, "/engines/engine[%d]/rpm", i);
+    fgTie(buf, get_engine(i), &FGEngInterface::get_RPM);
+
+    sprintf(buf, "/engines/engine[%d]/egt-degf", i);
+    fgTie(buf, get_engine(i), &FGEngInterface::get_EGT);
+
+    sprintf(buf, "/engines/engine[%d]/cht-degf", i);
+    fgTie(buf, get_engine(i), &FGEngInterface::get_CHT);
+
+    sprintf(buf, "/engines/engine[%d]/oil-temperature-degf", i);
+    fgTie(buf, get_engine(i), &FGEngInterface::get_Oil_Temp);
+
+    sprintf(buf, "/engines/engine[%d]/mp-osi", i);
+    fgTie(buf, get_engine(i), &FGEngInterface::get_Manifold_Pressure);
+
+    sprintf(buf, "/engines/engine[%d]/fuel-flow-gph", i);
+    fgTie(buf, get_engine(i), &FGEngInterface::get_Fuel_Flow);
+
+    sprintf(buf, "/engines/engine[%d]/running", i);
+    fgTie(buf, get_engine(i), &FGEngInterface::get_Running_Flag);
+
+    sprintf(buf, "/engines/engine[%d]/cranking", i);
+    fgTie(buf, get_engine(i), &FGEngInterface::get_Cranking_Flag);
+
+  }
+}
+
+
+/**
+ * Unbind any properties bound to this FDM.
+ *
+ * This method allows the FDM to release properties so that a new
+ * FDM can bind them instead.
+ */
+void
+FGInterface::unbind ()
+{
+  bound = false;
+
+  fgUntie("/fdm/time/delta_t");
+  fgUntie("/fdm/time/elapsed");
+  fgUntie("/fdm/time/remainder");
+  fgUntie("/fdm/time/multi_loop");
+  fgUntie("/position/latitude-deg");
+  fgUntie("/position/longitude-deg");
+  fgUntie("/position/altitude-ft");
+  fgUntie("/position/altitude-agl-ft");
+  fgUntie("/orientation/heading-deg");
+  fgUntie("/orientation/pitch-deg");
+  fgUntie("/orientation/roll-deg");
+  fgUntie("/velocities/airspeed-kt");
+  fgUntie("/velocities/speed-north-fps");
+  fgUntie("/velocities/speed-east-fps");
+  fgUntie("/velocities/speed-down-fps");
+  fgUntie("/velocities/uBody-fps");
+  fgUntie("/velocities/vBody-fps");
+  fgUntie("/velocities/wBody-fps");
+  fgUntie("/velocities/vertical-speed-fps");
+  fgUntie("/velocities/side-slip-rad");
+  for (int i = 0; i < get_num_engines(); i++) {
+    char buf[64];
+    sprintf(buf, "/engines/engine[%d]/rpm", i);
+    fgUntie(buf);
+    sprintf(buf, "/engines/engine[%d]/egt-degf", i);
+    fgUntie(buf);
+    sprintf(buf, "/engines/engine[%d]/cht-degf", i);
+    fgUntie(buf);
+    sprintf(buf, "/engines/engine[%d]/oil-temperature-degf", i);
+    fgUntie(buf);
+    sprintf(buf, "/engines/engine[%d]/mp-osi", i);
+    fgUntie(buf);
+    sprintf(buf, "/engines/engine[%d]/fuel-flow-gph", i);
+    fgUntie(buf);
+    sprintf(buf, "/engines/engine[%d]/running", i);
+    fgUntie(buf);
+    sprintf(buf, "/engines/engine[%d]/cranking", i);
+    fgUntie(buf);
+  }
+}
+
+void
+FGInterface::free_engines ()
+{
+    int i;
+    for ( i = 0; i < get_num_engines(); ++i ) {
+        delete get_engine(i);
+    }
+    engines.clear();
+}
+
+void
+FGInterface::free_gear_units ()
+{
+    int i;
+    for ( i = 0; i < get_num_gear(); ++i ) {
+        delete [] get_gear_unit(i);
+    }
+    gear.clear();
+}
+
+/**
+ * Update the state of the FDM (i.e. run the equations of motion).
+ */
+void
+FGInterface::update (int dt)
+{
+    cout << "dummy update() ... SHOULDN'T BE CALLED!" << endl;
+}
+
+
+void FGInterface::_updateGeodeticPosition( double lat, double lon, double alt )
+{
+    double lat_geoc, sl_radius;
+
+    // cout << "starting sea level rad = " << get_Sea_level_radius() << endl;
+
+    sgGeodToGeoc( lat, alt * SG_FEET_TO_METER, &sl_radius, &lat_geoc );
+
+    SG_LOG( SG_FLIGHT, SG_DEBUG, "lon = " << lon 
+	    << " lat_geod = " << lat
+	    << " lat_geoc = " << lat_geoc
+	    << " alt = " << alt 
+	    << " sl_radius = " << sl_radius * SG_METER_TO_FEET
+	    << " Equator = " << SG_EQUATORIAL_RADIUS_FT );
+
+    _set_Geocentric_Position( lat_geoc, lon, 
+			      sl_radius * SG_METER_TO_FEET + alt );
+	
+    _set_Geodetic_Position( lat, lon, alt );
+
+    _set_Sea_level_radius( sl_radius * SG_METER_TO_FEET );
+    _set_Runway_altitude( scenery.get_cur_elev() * SG_METER_TO_FEET );
+
+    _set_sin_lat_geocentric( lat_geoc );
+    _set_cos_lat_geocentric( lat_geoc );
+
+    _set_sin_cos_longitude( lon );
+
+    _set_sin_cos_latitude( lat );
+
+    /* Norman's code for slope of the terrain */
+    /* needs to be tested -- get it on the HUD and taxi around */
+    /* double *tnorm = scenery.cur_normal;
+
+       double sy = sin ( -get_Psi() ) ;
+       double cy = cos ( -get_Psi() ) ;
+
+       double phitb, thetatb, psitb;
+       if ( tnorm[1] != 0.0 ) {
+           psitb = -atan2 ( tnorm[0], tnorm[1] );
+       }
+       if ( tnorm[2] != 0.0 ) {	
+	   thetatb =  atan2 ( tnorm[0] * cy - tnorm[1] * sy, tnorm[2] );
+	   phitb = -atan2 ( tnorm[1] * cy + tnorm[0] * sy, tnorm[2] );  
+       }	
+	
+       _set_terrain_slope(phitb, thetatb, psitb) 
+     */
+}
+
+
+void FGInterface::_updateGeocentricPosition( double lat_geoc, double lon,
+					     double alt )
+{
+    double lat_geod, tmp_alt, sl_radius1, sl_radius2, tmp_lat_geoc;
+
+    // cout << "starting sea level rad = " << get_Sea_level_radius() << endl;
+
+    sgGeocToGeod( lat_geoc, ( get_Sea_level_radius() + alt ) * SG_FEET_TO_METER,
+		  &lat_geod, &tmp_alt, &sl_radius1 );
+    sgGeodToGeoc( lat_geod, alt * SG_FEET_TO_METER, &sl_radius2, &tmp_lat_geoc );
+
+    SG_LOG( SG_FLIGHT, SG_DEBUG, "lon = " << lon 
+	    << " lat_geod = " << lat_geod
+	    << " lat_geoc = " << lat_geoc
+	    << " alt = " << alt 
+	    << " tmp_alt = " << tmp_alt * SG_METER_TO_FEET
+	    << " sl_radius1 = " << sl_radius1 * SG_METER_TO_FEET
+	    << " sl_radius2 = " << sl_radius2 * SG_METER_TO_FEET
+	    << " Equator = " << SG_EQUATORIAL_RADIUS_FT );
+
+    _set_Geocentric_Position( lat_geoc, lon, 
+			      sl_radius2 * SG_METER_TO_FEET + alt );
+	
+    _set_Geodetic_Position( lat_geod, lon, alt );
+
+    _set_Sea_level_radius( sl_radius2 * SG_METER_TO_FEET );
+    _set_Runway_altitude( scenery.get_cur_elev() * SG_METER_TO_FEET );
+
+    _set_sin_lat_geocentric( lat_geoc );
+    _set_cos_lat_geocentric( lat_geoc );
+
+    _set_sin_cos_longitude( lon );
+
+    _set_sin_cos_latitude( lat_geod );
+
+    /* Norman's code for slope of the terrain */
+    /* needs to be tested -- get it on the HUD and taxi around */
+    /* double *tnorm = scenery.cur_normal;
+
+       double sy = sin ( -get_Psi() ) ;
+       double cy = cos ( -get_Psi() ) ;
+
+       double phitb, thetatb, psitb;
+       if ( tnorm[1] != 0.0 ) {
+           psitb = -atan2 ( tnorm[0], tnorm[1] );
+       }
+       if ( tnorm[2] != 0.0 ) {	
+	   thetatb =  atan2 ( tnorm[0] * cy - tnorm[1] * sy, tnorm[2] );
+	   phitb = -atan2 ( tnorm[1] * cy + tnorm[0] * sy, tnorm[2] );  
+       }	
+	
+       _set_terrain_slope(phitb, thetatb, psitb) 
+     */
+}
+
 
 // Extrapolate fdm based on time_offset (in usec)
 void FGInterface::extrapolate( int time_offset ) {
@@ -75,131 +638,219 @@ void FGInterface::extrapolate( int time_offset ) {
 }
 
 
-// Initialize the flight model parameters
-int fgFDMInit(int model, FGInterface& f, double dt) {
-    double save_alt = 0.0;
+// Set the altitude (force)
+void fgFDMForceAltitude(const string &model, double alt_meters) {
+    SG_LOG(SG_FLIGHT,SG_INFO, "fgFDMForceAltitude: " << alt_meters );
+
+    double sea_level_radius_meters;
+    double lat_geoc;
 
-    FG_LOG( FG_FLIGHT ,FG_INFO, "Initializing flight model" );
+    // Set the FG variables first
+    sgGeodToGeoc( base_fdm_state.get_Latitude(), alt_meters, 
+		  &sea_level_radius_meters, &lat_geoc);
 
-    base_fdm_state = f;
+    base_fdm_state.set_Altitude( alt_meters * SG_METER_TO_FEET );
+    base_fdm_state.set_Sea_level_radius( sea_level_radius_meters *
+					 SG_METER_TO_FEET ); 
+		
+    cur_fdm_state->set_Altitude( alt_meters * SG_METER_TO_FEET );
+    cur_fdm_state->set_Sea_level_radius( sea_level_radius_meters * 
+                                         SG_METER_TO_FEET );			  
 
-    if ( model == FGInterface::FG_SLEW ) {
-	// fgSlewInit(dt);
-#ifndef __MWERKS__   // -dw- 04/22/99 JSB sim not ported yet
-    } else if ( model == FGInterface::FG_JSBSIM ) {
-	fgJSBsimInit(dt, f);
-	fgJSBsim_2_FGInterface(base_fdm_state);
-#endif
-    } else if ( model == FGInterface::FG_LARCSIM ) {
-	// lets try to avoid really screwing up the LaRCsim model
-	if ( base_fdm_state.get_Altitude() < -9000.0 ) {
-	    save_alt = base_fdm_state.get_Altitude();
-	    base_fdm_state.set_Altitude( 0.0 );
-	}
-
-	// translate FG to LaRCsim structure
-	FGInterface_2_LaRCsim(base_fdm_state);
-
-	// initialize LaRCsim
-	fgLaRCsimInit(dt);
-
-	FG_LOG( FG_FLIGHT, FG_INFO, "FG pos = " << 
-		base_fdm_state.get_Latitude() );
-
-	// translate LaRCsim back to FG structure
-	fgLaRCsim_2_FGInterface(base_fdm_state);
-
-	// but lets restore our original bogus altitude when we are done
-	if ( save_alt < -9000.0 ) {
-	    base_fdm_state.set_Altitude( save_alt );
-	}
-    } else if ( model == FGInterface::FG_EXTERNAL ) {
-	fgExternalInit(base_fdm_state);
-    } else {
-	FG_LOG( FG_FLIGHT, FG_WARN,
-		"Unimplemented flight model == " << model );
+    // additional work needed for some flight models
+    if ( model == "larcsim" ) {
+	ls_ForceAltitude( base_fdm_state.get_Altitude() );
     }
+}
 
-    // set valid time for this record
-    base_fdm_state.stamp_time();
-	
-    f = base_fdm_state;
 
-    return 1;
+// Positions
+void FGInterface::set_Latitude(double lat) {
+    geodetic_position_v[0] = lat;
 }
 
+void FGInterface::set_Longitude(double lon) {
+    geodetic_position_v[1] = lon;
+}
 
-// Run multiloop iterations of the flight model
-int fgFDMUpdate(int model, FGInterface& f, int multiloop, int time_offset) {
-    double time_step, start_elev, end_elev;
-
-    // printf("Altitude = %.2f\n", FG_Altitude * 0.3048);
+void FGInterface::set_Altitude(double alt) {
+    geodetic_position_v[2] = alt;
+}
 
-    // set valid time for this record
-    base_fdm_state.stamp_time();
+void FGInterface::set_AltitudeAGL(double altagl) {
+    altitude_agl=altagl;
+}
 
-    time_step = (1.0 / current_options.get_model_hz()) * multiloop;
-    start_elev = base_fdm_state.get_Altitude();
+// Velocities
+void FGInterface::set_V_calibrated_kts(double vc) {
+    v_calibrated_kts = vc;
+}
 
-    if ( model == FGInterface::FG_SLEW ) {
-	// fgSlewUpdate(f, multiloop);
-#ifndef __MWERKS__   // -dw- 04/22/99 JSB sim not ported yet
-    } else if ( model == FGInterface::FG_JSBSIM ) {
-	fgJSBsimUpdate(base_fdm_state, multiloop);
-	f = base_fdm_state;
-#endif
-    } else if ( model == FGInterface::FG_LARCSIM ) {
-	fgLaRCsimUpdate(base_fdm_state, multiloop);
-	// extrapolate position based on actual time
-	// f = extrapolate_fdm( base_fdm_state, time_offset );
-	f = base_fdm_state;
-    } else if ( model == FGInterface::FG_EXTERNAL ) {
-	// fgExternalUpdate(f, multiloop);
-	FGTimeStamp current;
-	current.stamp();
-	f = base_fdm_state;
-	f.extrapolate( current - base_fdm_state.get_time_stamp() );
-    } else {
-	FG_LOG( FG_FLIGHT, FG_WARN,
-		"Unimplemented flight model == " <<  model );
-    }
+void FGInterface::set_Mach_number(double mach) {
+    mach_number = mach;
+}
 
-    end_elev = base_fdm_state.get_Altitude();
+void FGInterface::set_Velocities_Local( double north, 
+					double east, 
+					double down ){
+    v_local_v[0] = north;
+    v_local_v[1] = east;
+    v_local_v[2] = down;
+}
 
-    if ( time_step > 0.0 ) {
-	// feet per second
-	base_fdm_state.set_Climb_Rate( (end_elev - start_elev) / time_step );
-    }
+void FGInterface::set_Velocities_Wind_Body( double u, 
+					    double v, 
+					    double w){
+    v_wind_body_v[0] = u;
+    v_wind_body_v[1] = v;
+    v_wind_body_v[2] = w;
+}
 
-    return 1;
+// Euler angles 
+void FGInterface::set_Euler_Angles( double phi, 
+				    double theta, 
+				    double psi ) {
+    euler_angles_v[0] = phi;
+    euler_angles_v[1] = theta;
+    euler_angles_v[2] = psi;                                            
+}  
+
+// Flight Path
+void FGInterface::set_Climb_Rate( double roc) {
+    climb_rate = roc;
 }
 
+void FGInterface::set_Gamma_vert_rad( double gamma) {
+    gamma_vert_rad = gamma;
+}
 
-// Set the altitude (force)
-void fgFDMForceAltitude(int model, double alt_meters) {
-    double sea_level_radius_meters;
-    double lat_geoc;
+// Earth
+void FGInterface::set_Sea_level_radius(double slr) {
+    sea_level_radius = slr;
+}
 
-    // Set the FG variables first
-    fgGeodToGeoc( base_fdm_state.get_Latitude(), alt_meters, 
-		  &sea_level_radius_meters, &lat_geoc);
+void FGInterface::set_Runway_altitude(double ralt) {
+    runway_altitude = ralt;
+}
 
-    base_fdm_state.set_Altitude( alt_meters * METER_TO_FEET );
-    base_fdm_state.set_Radius_to_vehicle( base_fdm_state.get_Altitude() + 
-					  (sea_level_radius_meters * 
-					   METER_TO_FEET) );
+void FGInterface::set_Static_pressure(double p) { static_pressure = p; }
+void FGInterface::set_Static_temperature(double T) { static_temperature = T; }
+void FGInterface::set_Density(double rho) { density = rho; }
 
-    // additional work needed for some flight models
-    if ( model == FGInterface::FG_LARCSIM ) {
-	ls_ForceAltitude( base_fdm_state.get_Altitude() );
-    }
+void FGInterface::set_Velocities_Local_Airmass (double wnorth, 
+						double weast, 
+						double wdown ) {
+    v_local_airmass_v[0] = wnorth;
+    v_local_airmass_v[1] = weast;
+    v_local_airmass_v[2] = wdown;
 }
 
 
-// Set the local ground elevation
-void fgFDMSetGroundElevation(int model, double ground_meters) {
-    base_fdm_state.set_Runway_altitude( ground_meters * METER_TO_FEET );
-    cur_fdm_state.set_Runway_altitude( ground_meters * METER_TO_FEET );
+void FGInterface::_busdump(void) {
+
+    SG_LOG(SG_FLIGHT,SG_INFO,"d_pilot_rp_body_v[3]: " << d_pilot_rp_body_v[0] << ", " << d_pilot_rp_body_v[1] << ", " << d_pilot_rp_body_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"d_cg_rp_body_v[3]: " << d_cg_rp_body_v[0] << ", " << d_cg_rp_body_v[1] << ", " << d_cg_rp_body_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"f_body_total_v[3]: " << f_body_total_v[0] << ", " << f_body_total_v[1] << ", " << f_body_total_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"f_local_total_v[3]: " << f_local_total_v[0] << ", " << f_local_total_v[1] << ", " << f_local_total_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"f_aero_v[3]: " << f_aero_v[0] << ", " << f_aero_v[1] << ", " << f_aero_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"f_engine_v[3]: " << f_engine_v[0] << ", " << f_engine_v[1] << ", " << f_engine_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"f_gear_v[3]: " << f_gear_v[0] << ", " << f_gear_v[1] << ", " << f_gear_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"m_total_rp_v[3]: " << m_total_rp_v[0] << ", " << m_total_rp_v[1] << ", " << m_total_rp_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"m_total_cg_v[3]: " << m_total_cg_v[0] << ", " << m_total_cg_v[1] << ", " << m_total_cg_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"m_aero_v[3]: " << m_aero_v[0] << ", " << m_aero_v[1] << ", " << m_aero_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"m_engine_v[3]: " << m_engine_v[0] << ", " << m_engine_v[1] << ", " << m_engine_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"m_gear_v[3]: " << m_gear_v[0] << ", " << m_gear_v[1] << ", " << m_gear_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"v_dot_local_v[3]: " << v_dot_local_v[0] << ", " << v_dot_local_v[1] << ", " << v_dot_local_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"v_dot_body_v[3]: " << v_dot_body_v[0] << ", " << v_dot_body_v[1] << ", " << v_dot_body_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"a_cg_body_v[3]: " << a_cg_body_v[0] << ", " << a_cg_body_v[1] << ", " << a_cg_body_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"a_pilot_body_v[3]: " << a_pilot_body_v[0] << ", " << a_pilot_body_v[1] << ", " << a_pilot_body_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"n_cg_body_v[3]: " << n_cg_body_v[0] << ", " << n_cg_body_v[1] << ", " << n_cg_body_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"n_pilot_body_v[3]: " << n_pilot_body_v[0] << ", " << n_pilot_body_v[1] << ", " << n_pilot_body_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"omega_dot_body_v[3]: " << omega_dot_body_v[0] << ", " << omega_dot_body_v[1] << ", " << omega_dot_body_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"v_local_v[3]: " << v_local_v[0] << ", " << v_local_v[1] << ", " << v_local_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"v_local_rel_ground_v[3]: " << v_local_rel_ground_v[0] << ", " << v_local_rel_ground_v[1] << ", " << v_local_rel_ground_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"v_local_airmass_v[3]: " << v_local_airmass_v[0] << ", " << v_local_airmass_v[1] << ", " << v_local_airmass_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"v_local_rel_airmass_v[3]: " << v_local_rel_airmass_v[0] << ", " << v_local_rel_airmass_v[1] << ", " << v_local_rel_airmass_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"v_local_gust_v[3]: " << v_local_gust_v[0] << ", " << v_local_gust_v[1] << ", " << v_local_gust_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"v_wind_body_v[3]: " << v_wind_body_v[0] << ", " << v_wind_body_v[1] << ", " << v_wind_body_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"omega_body_v[3]: " << omega_body_v[0] << ", " << omega_body_v[1] << ", " << omega_body_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"omega_local_v[3]: " << omega_local_v[0] << ", " << omega_local_v[1] << ", " << omega_local_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"omega_total_v[3]: " << omega_total_v[0] << ", " << omega_total_v[1] << ", " << omega_total_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"euler_rates_v[3]: " << euler_rates_v[0] << ", " << euler_rates_v[1] << ", " << euler_rates_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"geocentric_rates_v[3]: " << geocentric_rates_v[0] << ", " << geocentric_rates_v[1] << ", " << geocentric_rates_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"geocentric_position_v[3]: " << geocentric_position_v[0] << ", " << geocentric_position_v[1] << ", " << geocentric_position_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"geodetic_position_v[3]: " << geodetic_position_v[0] << ", " << geodetic_position_v[1] << ", " << geodetic_position_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"euler_angles_v[3]: " << euler_angles_v[0] << ", " << euler_angles_v[1] << ", " << euler_angles_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"d_cg_rwy_local_v[3]: " << d_cg_rwy_local_v[0] << ", " << d_cg_rwy_local_v[1] << ", " << d_cg_rwy_local_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"d_cg_rwy_rwy_v[3]: " << d_cg_rwy_rwy_v[0] << ", " << d_cg_rwy_rwy_v[1] << ", " << d_cg_rwy_rwy_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"d_pilot_rwy_local_v[3]: " << d_pilot_rwy_local_v[0] << ", " << d_pilot_rwy_local_v[1] << ", " << d_pilot_rwy_local_v[2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"d_pilot_rwy_rwy_v[3]: " << d_pilot_rwy_rwy_v[0] << ", " << d_pilot_rwy_rwy_v[1] << ", " << d_pilot_rwy_rwy_v[2]);
+
+    SG_LOG(SG_FLIGHT,SG_INFO,"t_local_to_body_m[0][3]: " << t_local_to_body_m[0][0] << ", " << t_local_to_body_m[0][1] << ", " << t_local_to_body_m[0][2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"t_local_to_body_m[1][3]: " << t_local_to_body_m[1][0] << ", " << t_local_to_body_m[1][1] << ", " << t_local_to_body_m[1][2]);
+    SG_LOG(SG_FLIGHT,SG_INFO,"t_local_to_body_m[2][3]: " << t_local_to_body_m[2][0] << ", " << t_local_to_body_m[2][1] << ", " << t_local_to_body_m[2][2]);
+
+    SG_LOG(SG_FLIGHT,SG_INFO,"mass: " << mass );
+    SG_LOG(SG_FLIGHT,SG_INFO,"i_xx: " << i_xx );
+    SG_LOG(SG_FLIGHT,SG_INFO,"i_yy: " << i_yy );
+    SG_LOG(SG_FLIGHT,SG_INFO,"i_zz: " << i_zz );
+    SG_LOG(SG_FLIGHT,SG_INFO,"i_xz: " << i_xz );
+    SG_LOG(SG_FLIGHT,SG_INFO,"nlf: " << nlf );
+    SG_LOG(SG_FLIGHT,SG_INFO,"v_rel_wind: " << v_rel_wind );
+    SG_LOG(SG_FLIGHT,SG_INFO,"v_true_kts: " << v_true_kts );
+    SG_LOG(SG_FLIGHT,SG_INFO,"v_rel_ground: " << v_rel_ground );
+    SG_LOG(SG_FLIGHT,SG_INFO,"v_inertial: " << v_inertial );
+    SG_LOG(SG_FLIGHT,SG_INFO,"v_ground_speed: " << v_ground_speed );
+    SG_LOG(SG_FLIGHT,SG_INFO,"v_equiv: " << v_equiv );
+    SG_LOG(SG_FLIGHT,SG_INFO,"v_equiv_kts: " << v_equiv_kts );
+    SG_LOG(SG_FLIGHT,SG_INFO,"v_calibrated: " << v_calibrated );
+    SG_LOG(SG_FLIGHT,SG_INFO,"v_calibrated_kts: " << v_calibrated_kts );
+    SG_LOG(SG_FLIGHT,SG_INFO,"gravity: " << gravity );
+    SG_LOG(SG_FLIGHT,SG_INFO,"centrifugal_relief: " << centrifugal_relief );
+    SG_LOG(SG_FLIGHT,SG_INFO,"alpha: " << alpha );
+    SG_LOG(SG_FLIGHT,SG_INFO,"beta: " << beta );
+    SG_LOG(SG_FLIGHT,SG_INFO,"alpha_dot: " << alpha_dot );
+    SG_LOG(SG_FLIGHT,SG_INFO,"beta_dot: " << beta_dot );
+    SG_LOG(SG_FLIGHT,SG_INFO,"cos_alpha: " << cos_alpha );
+    SG_LOG(SG_FLIGHT,SG_INFO,"sin_alpha: " << sin_alpha );
+    SG_LOG(SG_FLIGHT,SG_INFO,"cos_beta: " << cos_beta );
+    SG_LOG(SG_FLIGHT,SG_INFO,"sin_beta: " << sin_beta );
+    SG_LOG(SG_FLIGHT,SG_INFO,"cos_phi: " << cos_phi );
+    SG_LOG(SG_FLIGHT,SG_INFO,"sin_phi: " << sin_phi );
+    SG_LOG(SG_FLIGHT,SG_INFO,"cos_theta: " << cos_theta );
+    SG_LOG(SG_FLIGHT,SG_INFO,"sin_theta: " << sin_theta );
+    SG_LOG(SG_FLIGHT,SG_INFO,"cos_psi: " << cos_psi );
+    SG_LOG(SG_FLIGHT,SG_INFO,"sin_psi: " << sin_psi );
+    SG_LOG(SG_FLIGHT,SG_INFO,"gamma_vert_rad: " << gamma_vert_rad );
+    SG_LOG(SG_FLIGHT,SG_INFO,"gamma_horiz_rad: " << gamma_horiz_rad );
+    SG_LOG(SG_FLIGHT,SG_INFO,"sigma: " << sigma );
+    SG_LOG(SG_FLIGHT,SG_INFO,"density: " << density );
+    SG_LOG(SG_FLIGHT,SG_INFO,"v_sound: " << v_sound );
+    SG_LOG(SG_FLIGHT,SG_INFO,"mach_number: " << mach_number );
+    SG_LOG(SG_FLIGHT,SG_INFO,"static_pressure: " << static_pressure );
+    SG_LOG(SG_FLIGHT,SG_INFO,"total_pressure: " << total_pressure );
+    SG_LOG(SG_FLIGHT,SG_INFO,"impact_pressure: " << impact_pressure );
+    SG_LOG(SG_FLIGHT,SG_INFO,"dynamic_pressure: " << dynamic_pressure );
+    SG_LOG(SG_FLIGHT,SG_INFO,"static_temperature: " << static_temperature );
+    SG_LOG(SG_FLIGHT,SG_INFO,"total_temperature: " << total_temperature );
+    SG_LOG(SG_FLIGHT,SG_INFO,"sea_level_radius: " << sea_level_radius );
+    SG_LOG(SG_FLIGHT,SG_INFO,"earth_position_angle: " << earth_position_angle );
+    SG_LOG(SG_FLIGHT,SG_INFO,"runway_altitude: " << runway_altitude );
+    SG_LOG(SG_FLIGHT,SG_INFO,"runway_latitude: " << runway_latitude );
+    SG_LOG(SG_FLIGHT,SG_INFO,"runway_longitude: " << runway_longitude );
+    SG_LOG(SG_FLIGHT,SG_INFO,"runway_heading: " << runway_heading );
+    SG_LOG(SG_FLIGHT,SG_INFO,"radius_to_rwy: " << radius_to_rwy );
+    SG_LOG(SG_FLIGHT,SG_INFO,"climb_rate: " << climb_rate );
+    SG_LOG(SG_FLIGHT,SG_INFO,"sin_lat_geocentric: " << sin_lat_geocentric );
+    SG_LOG(SG_FLIGHT,SG_INFO,"cos_lat_geocentric: " << cos_lat_geocentric );
+    SG_LOG(SG_FLIGHT,SG_INFO,"sin_longitude: " << sin_longitude );
+    SG_LOG(SG_FLIGHT,SG_INFO,"cos_longitude: " << cos_longitude );
+    SG_LOG(SG_FLIGHT,SG_INFO,"sin_latitude: " << sin_latitude );
+    SG_LOG(SG_FLIGHT,SG_INFO,"cos_latitude: " << cos_latitude );
+    SG_LOG(SG_FLIGHT,SG_INFO,"altitude_agl: " << altitude_agl );
 }
 
 
+void fgToggleFDMdataLogging(void) {
+  cur_fdm_state->ToggleDataLogging();
+}