FGTurboProp.cpp

/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

 Module:       FGTurboProp.cpp
 Author:       Jiri "Javky" Javurek
               based on SimTurbine and Turbine engine from David Culp
 Date started: 05/14/2004
 Purpose:      This module models a turbo propeller engine.

 ------------- Copyright (C) 2004  (javky@email.cz) ---------

 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU Lesser 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 Lesser General Public License for more
 details.

 You should have received a copy of the GNU Lesser 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.

 Further information about the GNU Lesser General Public License can also be found on
 the world wide web at http://www.gnu.org.

FUNCTIONAL DESCRIPTION
--------------------------------------------------------------------------------

This class descends from the FGEngine class and models a Turbo propeller engine
based on parameters given in the engine config file for this class

HISTORY
--------------------------------------------------------------------------------
05/14/2004  Created
02/08/2011  T. Kreitler, added rotor support

//JVK (mark)

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
INCLUDES
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/

#include <iostream>
#include <sstream>

#include "FGTurboProp.h"
#include "FGPropeller.h"
#include "FGRotor.h"

using namespace std;

namespace JSBSim {

static const char *IdSrc = "$Id: FGTurboProp.cpp,v 1.24 2011/09/25 23:56:11 jentron Exp $";
static const char *IdHdr = ID_TURBOPROP;

/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
CLASS IMPLEMENTATION
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/

FGTurboProp::FGTurboProp(FGFDMExec* exec, Element *el, int engine_number, struct Inputs& input)
  : FGEngine(exec, el, engine_number, input),
    ITT_N1(NULL), EnginePowerRPM_N1(NULL), EnginePowerVC(NULL)
{
  SetDefaults();
  thrusterType = Thruster->GetType();

  Load(exec, el);
  bindmodel();
  Debug(0);
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

FGTurboProp::~FGTurboProp()
{
  delete ITT_N1;
  delete EnginePowerRPM_N1;
  delete EnginePowerVC;
  Debug(1);
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

bool FGTurboProp::Load(FGFDMExec* exec, Element *el)
{
  IdleFF=-1;
  MaxStartingTime = 999999; //very big timeout -> infinite
  Ielu_max_torque=-1;

// ToDo: Need to make sure units are properly accounted for below.

  if (el->FindElement("milthrust"))
    MilThrust = el->FindElementValueAsNumberConvertTo("milthrust","LBS");
  if (el->FindElement("idlen1"))
    IdleN1 = el->FindElementValueAsNumber("idlen1");
  if (el->FindElement("idlen2"))
    IdleN2 = el->FindElementValueAsNumber("idlen2");
  if (el->FindElement("maxn1"))
    MaxN1 = el->FindElementValueAsNumber("maxn1");
  if (el->FindElement("maxn2"))
    MaxN2 = el->FindElementValueAsNumber("maxn2");
  if (el->FindElement("betarangeend"))
    BetaRangeThrottleEnd = el->FindElementValueAsNumber("betarangeend")/100.0;
  BetaRangeThrottleEnd = Constrain(0.0, BetaRangeThrottleEnd, 0.99999);
  if (el->FindElement("reversemaxpower"))
    ReverseMaxPower = el->FindElementValueAsNumber("reversemaxpower")/100.0;

  if (el->FindElement("maxpower"))
    MaxPower = el->FindElementValueAsNumber("maxpower");
  if (el->FindElement("idlefuelflow"))
    IdleFF = el->FindElementValueAsNumber("idlefuelflow");
  if (el->FindElement("psfc"))
    PSFC = el->FindElementValueAsNumber("psfc");
  if (el->FindElement("n1idle_max_delay"))
    Idle_Max_Delay = el->FindElementValueAsNumber("n1idle_max_delay");
  if (el->FindElement("maxstartingtime"))
    MaxStartingTime = el->FindElementValueAsNumber("maxstartingtime");
  if (el->FindElement("startern1"))
    StarterN1 = el->FindElementValueAsNumber("startern1");
  if (el->FindElement("ielumaxtorque"))
    Ielu_max_torque = el->FindElementValueAsNumber("ielumaxtorque");
  if (el->FindElement("itt_delay"))
    ITT_Delay = el->FindElementValueAsNumber("itt_delay");

  Element *table_element;
  string name;
  FGPropertyManager* PropertyManager = exec->GetPropertyManager();

  while (true) {
    table_element = el->FindNextElement("table");
    if (!table_element) break;
    name = table_element->GetAttributeValue("name");
    if (name == "EnginePowerVC") {
      EnginePowerVC = new FGTable(PropertyManager, table_element);
    } else if (name == "EnginePowerRPM_N1") {
      EnginePowerRPM_N1 = new FGTable(PropertyManager, table_element);
    } else if (name == "ITT_N1") {
      ITT_N1 = new FGTable(PropertyManager, table_element);
    } else {
      cerr << "Unknown table type: " << name << " in turbine definition." <<
      endl;
    }
  }

  // Pre-calculations and initializations

  delay=1;
  N1_factor = MaxN1 - IdleN1;
  N2_factor = MaxN2 - IdleN2;
  OilTemp_degK = in.TAT_c + 273.0;
  if (IdleFF==-1) IdleFF = pow(MilThrust, 0.2) * 107.0;  // just an estimate

  // cout << "ENG POWER:" << EnginePowerRPM_N1->GetValue(1200,90) << endl;

  return true;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
// The main purpose of Calculate() is to determine what phase the engine should
// be in, then call the corresponding function.

void FGTurboProp::Calculate(void)
{
  RunPreFunctions();

  TAT = in.TAT_c;

  ThrottlePos = in.ThrottlePos[EngineNumber];

/* The thruster controls the engine RPM because it encapsulates the gear ratio and other transmission variables */
  RPM = Thruster->GetEngineRPM();
  if (thrusterType == FGThruster::ttPropeller) {
    ((FGPropeller*)Thruster)->SetAdvance(in.PropAdvance[EngineNumber]);
    ((FGPropeller*)Thruster)->SetFeather(in.PropFeather[EngineNumber]);
    ((FGPropeller*)Thruster)->SetReverse(Reversed);
    if (Reversed) {
      ((FGPropeller*)Thruster)->SetReverseCoef(ThrottlePos);
    } else {
      ((FGPropeller*)Thruster)->SetReverseCoef(0.0);
    }

    if (Reversed) {
      if (ThrottlePos < BetaRangeThrottleEnd) {
          ThrottlePos = 0.0;  // idle when in Beta-range
      } else {
        // when reversed:
        ThrottlePos = (ThrottlePos-BetaRangeThrottleEnd)/(1-BetaRangeThrottleEnd) * ReverseMaxPower;
      }
    }
  }

  // When trimming is finished check if user wants engine OFF or RUNNING
  if ((phase == tpTrim) && (in.TotalDeltaT > 0)) {
    if (Running && !Starved) {
      phase = tpRun;
      N2 = IdleN2;
      N1 = IdleN1;
      OilTemp_degK = 366.0;
      Cutoff = false;
    } else {
      phase = tpOff;
      Cutoff = true;
      Eng_ITT_degC = TAT;
      Eng_Temperature = TAT;
      OilTemp_degK = TAT+273.15;
    }
  }

  if (!Running && Starter) {
    if (phase == tpOff) {
      phase = tpSpinUp;
      if (StartTime < 0) StartTime=0;
    }
  }
  if (!Running && !Cutoff && (N1 > 15.0)) {
    phase = tpStart;
    StartTime = -1;
  }
  if (Cutoff && (phase != tpSpinUp)) phase = tpOff;
  if (in.TotalDeltaT == 0) phase = tpTrim;
  if (Starved) phase = tpOff;
  if (Condition >= 10) {
    phase = tpOff;
    StartTime=-1;
  }

  // limiter intervention wanted?
  if (Ielu_max_torque > 0.0) {
    double torque = 0.0;
    
    if (thrusterType == FGThruster::ttPropeller) {
      torque = ((FGPropeller*)(Thruster))->GetTorque();
    } else if (thrusterType == FGThruster::ttRotor) {
      torque = ((FGRotor*)(Thruster))->GetTorque();
    }

    if (Condition < 1) {
      if ( abs(torque) > Ielu_max_torque && ThrottlePos >= OldThrottle ) {
        ThrottlePos = OldThrottle - 0.1 * in.TotalDeltaT; //IELU down
        Ielu_intervent = true;
      } else if ( Ielu_intervent && ThrottlePos >= OldThrottle) {
        ThrottlePos = OldThrottle + 0.05 * in.TotalDeltaT; //IELU up
        Ielu_intervent = true;
      } else {
        Ielu_intervent = false;
      }
    } else {
      Ielu_intervent = false;
    }
    OldThrottle = ThrottlePos;
  }

  switch (phase) {
    case tpOff:    HP = Off(); break;
    case tpRun:    HP = Run(); break;
    case tpSpinUp: HP = SpinUp(); break;
    case tpStart:  HP = Start(); break;
    default: HP = 0;
  }
 
  LoadThrusterInputs();
  Thruster->Calculate(HP * hptoftlbssec);

  RunPostFunctions();
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

double FGTurboProp::Off(void)
{
  Running = false; EngStarting = false;

  FuelFlow_pph = Seek(&FuelFlow_pph, 0, 800.0, 800.0);

  //allow the air turn with generator
  N1 = ExpSeek(&N1, in.qbar/15.0, Idle_Max_Delay*2.5, Idle_Max_Delay * 5);

  OilTemp_degK = ExpSeek(&OilTemp_degK,273.15 + TAT, 400 , 400);

  Eng_Temperature = ExpSeek(&Eng_Temperature,TAT,300,400);
  double ITT_goal = ITT_N1->GetValue(N1,0.1) + ((N1>20) ? 0.0 : (20-N1)/20.0 * Eng_Temperature);
  Eng_ITT_degC  = ExpSeek(&Eng_ITT_degC,ITT_goal,ITT_Delay,ITT_Delay*1.2);

  OilPressure_psi = (N1/100.0*0.25+(0.1-(OilTemp_degK-273.15)*0.1/80.0)*N1/100.0) / 7692.0e-6; //from MPa to psi

  if (RPM>5) return -0.012; // friction in engine when propeller spining (estimate)
  return 0.0;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

double FGTurboProp::Run(void)
{
  double thrust = 0.0, EngPower_HP, eff_coef;
  Running = true; Starter = false; EngStarting = false;

//---
  double old_N1 = N1;
  N1 = ExpSeek(&N1, IdleN1 + ThrottlePos * N1_factor, Idle_Max_Delay, Idle_Max_Delay * 2.4);

  EngPower_HP = EnginePowerRPM_N1->GetValue(RPM,N1);
  EngPower_HP *= EnginePowerVC->GetValue();
  if (EngPower_HP > MaxPower) EngPower_HP = MaxPower;

  eff_coef = 9.333 - (N1)/12; // 430%Fuel at 60%N1
  FuelFlow_pph = PSFC * EngPower_HP * eff_coef;

  Eng_Temperature = ExpSeek(&Eng_Temperature,Eng_ITT_degC,300,400);
  double ITT_goal = ITT_N1->GetValue((N1-old_N1)*300+N1,1);
  Eng_ITT_degC  = ExpSeek(&Eng_ITT_degC,ITT_goal,ITT_Delay,ITT_Delay*1.2);

  OilPressure_psi = (N1/100.0*0.25+(0.1-(OilTemp_degK-273.15)*0.1/80.0)*N1/100.0) / 7692.0e-6; //from MPa to psi
//---
  EPR = 1.0 + thrust/MilThrust;

  OilTemp_degK = Seek(&OilTemp_degK, 353.15, 0.4-N1*0.001, 0.04);

  if (Cutoff) phase = tpOff;
  if (Starved) phase = tpOff;

  return EngPower_HP;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

double FGTurboProp::SpinUp(void)
{
  double EngPower_HP;
  Running = false; EngStarting = true;
  FuelFlow_pph = 0.0;

  if (!GeneratorPower) {
    EngStarting=false;
    phase=tpOff;
    StartTime = -1;
    return 0.0;
  }

  N1 = ExpSeek(&N1, StarterN1, Idle_Max_Delay * 6, Idle_Max_Delay * 2.4);

  Eng_Temperature = ExpSeek(&Eng_Temperature,TAT,300,400);
  double ITT_goal = ITT_N1->GetValue(N1,0.1) + ((N1>20) ? 0.0 : (20-N1)/20.0 * Eng_Temperature);
  Eng_ITT_degC  = ExpSeek(&Eng_ITT_degC,ITT_goal,ITT_Delay,ITT_Delay*1.2);

  OilTemp_degK = ExpSeek(&OilTemp_degK,273.15 + TAT, 400 , 400);

  OilPressure_psi = (N1/100.0*0.25+(0.1-(OilTemp_degK-273.15)*0.1/80.0)*N1/100.0) / 7692.0e-6; //from MPa to psi
  NozzlePosition = 1.0;

  EngPower_HP = EnginePowerRPM_N1->GetValue(RPM,N1);
  EngPower_HP *= EnginePowerVC->GetValue();
  if (EngPower_HP > MaxPower) EngPower_HP = MaxPower;

  if (StartTime>=0) StartTime+=in.TotalDeltaT;
  if (StartTime > MaxStartingTime && MaxStartingTime > 0) { //start failed due timeout
    phase = tpOff;
    StartTime = -1;
  }

  return EngPower_HP;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

double FGTurboProp::Start(void)
{
  double EngPower_HP = 0.0;
  double eff_coef;

  EngStarting = false;
  if ((N1 > 15.0) && !Starved) {       // minimum 15% N2 needed for start
    double old_N1 = N1;
    Cranking = true;                   // provided for sound effects signal
    if (N1 < IdleN1) {
      EngPower_HP = EnginePowerRPM_N1->GetValue(RPM,N1);
      EngPower_HP *= EnginePowerVC->GetValue();
      if (EngPower_HP > MaxPower) EngPower_HP = MaxPower;
      N1 = ExpSeek(&N1, IdleN1*1.1, Idle_Max_Delay*4, Idle_Max_Delay * 2.4);
      eff_coef = 9.333 - (N1)/12; // 430%Fuel at 60%N1
      FuelFlow_pph = PSFC * EngPower_HP * eff_coef;
      Eng_Temperature = ExpSeek(&Eng_Temperature,Eng_ITT_degC,300,400);
      double ITT_goal = ITT_N1->GetValue((N1-old_N1)*300+N1,1);
      Eng_ITT_degC  = ExpSeek(&Eng_ITT_degC,ITT_goal,ITT_Delay,ITT_Delay*1.2);

      OilPressure_psi = (N1/100.0*0.25+(0.1-(OilTemp_degK-273.15)*0.1/80.0)*N1/100.0) / 7692.0e-6; //from MPa to psi
      OilTemp_degK = Seek(&OilTemp_degK, 353.15, 0.4-N1*0.001, 0.04);

    } else {
      phase = tpRun;
      Running = true;
      Starter = false;
      Cranking = false;
      FuelFlow_pph = 0;
    }
  } else {                 // no start if N2 < 15% or Starved
    phase = tpOff;
    Starter = false;
  }

  return EngPower_HP;
}


//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

double FGTurboProp::CalcFuelNeed(void)
{
  FuelFlowRate = FuelFlow_pph / 3600.0;
  FuelExpended = FuelFlowRate * in.TotalDeltaT;
  if (!Starved) FuelUsedLbs += FuelExpended;
  return FuelExpended;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

double FGTurboProp::Seek(double *var, double target, double accel, double decel)
{
  double v = *var;
  if (v > target) {
    v -= in.TotalDeltaT * decel;
    if (v < target) v = target;
  } else if (v < target) {
    v += in.TotalDeltaT * accel;
    if (v > target) v = target;
  }
  return v;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

double FGTurboProp::ExpSeek(double *var, double target, double accel_tau, double decel_tau)
{
// exponential delay instead of the linear delay used in Seek
  double v = *var;
  if (v > target) {
    v = (v - target) * exp ( -in.TotalDeltaT / decel_tau) + target;
  } else if (v < target) {
    v = (target - v) * (1 - exp ( -in.TotalDeltaT / accel_tau)) + v;
  }
  return v;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

void FGTurboProp::SetDefaults(void)
{
//  Name = "Not defined";
  N1 = N2 = 0.0;
  HP = 0.0;
  Type = etTurboprop;
  MilThrust = 10000.0;
  IdleN1 = 30.0;
  IdleN2 = 60.0;
  MaxN1 = 100.0;
  MaxN2 = 100.0;
  InletPosition = 1.0;
  NozzlePosition = 1.0;
  Reversed = false;
  Cutoff = true;
  phase = tpOff;
  Stalled = false;
  Seized = false;
  Overtemp = false;
  Fire = false;
  Eng_ITT_degC = 0.0;

  GeneratorPower=true;
  Condition = 0;
  Ielu_intervent=false;

  Idle_Max_Delay = 1.0;

  ThrottlePos = OldThrottle = 0.0;
  ITT_Delay = 0.05;
  ReverseMaxPower = 0.0;
  BetaRangeThrottleEnd = 0.0;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


string FGTurboProp::GetEngineLabels(const string& delimiter)
{
  std::ostringstream buf;

  buf << Name << "_N1[" << EngineNumber << "]" << delimiter
      << Name << "_N2[" << EngineNumber << "]" << delimiter
      << Name << "_PwrAvail[" << EngineNumber << "]" << delimiter
      << Thruster->GetThrusterLabels(EngineNumber, delimiter);

  return buf.str();
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

string FGTurboProp::GetEngineValues(const string& delimiter)
{
  std::ostringstream buf;

  buf << N1 << delimiter
      << N2 << delimiter
      << HP << delimiter
      << Thruster->GetThrusterValues(EngineNumber,delimiter);

  return buf.str();
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

int FGTurboProp::InitRunning(void)
{
  FDMExec->SuspendIntegration();
  Cutoff=false;
  Running=true;  
  N2=16.0;
  Calculate();
  FDMExec->ResumeIntegration();
  return phase==tpRun;
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

void FGTurboProp::bindmodel()
{
  string property_name, base_property_name;
  base_property_name = CreateIndexedPropertyName("propulsion/engine", EngineNumber);
  property_name = base_property_name + "/n1";
  PropertyManager->Tie( property_name.c_str(), &N1);
  // property_name = base_property_name + "/n2";
  // PropertyManager->Tie( property_name.c_str(), &N2);
  property_name = base_property_name + "/reverser";
  PropertyManager->Tie( property_name.c_str(), &Reversed);
  property_name = base_property_name + "/power-hp";
  PropertyManager->Tie( property_name.c_str(), &HP);
  property_name = base_property_name + "/itt-c";
  PropertyManager->Tie( property_name.c_str(), &Eng_ITT_degC);
  property_name = base_property_name + "/engtemp-c";
  PropertyManager->Tie( property_name.c_str(), &Eng_Temperature);
  property_name = base_property_name + "/ielu_intervent";
  PropertyManager->Tie( property_name.c_str(), &Ielu_intervent);
}

//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
//    The bitmasked value choices are as follows:
//    unset: In this case (the default) JSBSim would only print
//       out the normally expected messages, essentially echoing
//       the config files as they are read. If the environment
//       variable is not set, debug_lvl is set to 1 internally
//    0: This requests JSBSim not to output any messages
//       whatsoever.
//    1: This value explicity requests the normal JSBSim
//       startup messages
//    2: This value asks for a message to be printed out when
//       a class is instantiated
//    4: When this value is set, a message is displayed when a
//       FGModel object executes its Run() method
//    8: When this value is set, various runtime state variables
//       are printed out periodically
//    16: When set various parameters are sanity checked and
//       a message is printed out when they go out of bounds

void FGTurboProp::Debug(int from)
{
  if (debug_lvl <= 0) return;

  if (debug_lvl & 1) { // Standard console startup message output
    if (from == 0) { // Constructor

    }
    if (from == 2) { // called from Load()
      cout << "\n ****MUJ MOTOR TURBOPROP****\n";
      cout << "\n    Engine Name: "         << Name << endl;
      cout << "      MilThrust:   "         << MilThrust << endl;
      cout << "      IdleN1:      "         << IdleN1 << endl;
      cout << "      MaxN1:       "         << MaxN1 << endl;

      cout << endl;
    }
  }
  if (debug_lvl & 2 ) { // Instantiation/Destruction notification
    if (from == 0) cout << "Instantiated: FGTurboProp" << endl;
    if (from == 1) cout << "Destroyed:    FGTurboProp" << endl;
  }
  if (debug_lvl & 4 ) { // Run() method entry print for FGModel-derived objects
  }
  if (debug_lvl & 8 ) { // Runtime state variables
  }
  if (debug_lvl & 16) { // Sanity checking
  }
  if (debug_lvl & 64) {
    if (from == 0) { // Constructor
      cout << IdSrc << endl;
      cout << IdHdr << endl;
    }
  }
}
}