From cf7f829130141b982952db740a0bd3e6e0b49125 Mon Sep 17 00:00:00 2001
From: david <david>
Date: Mon, 14 Jan 2002 14:23:53 +0000
Subject: [PATCH] Added ability to set engine RPM from FlightGear.

---
 src/FDM/JSBSim.cxx          | 1 +
 src/FDM/JSBSim/FGThruster.h | 1 +
 src/FDM/flight.cxx          | 4 +++-
 3 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/FDM/JSBSim.cxx b/src/FDM/JSBSim.cxx
index 0475d214d..b71439e85 100644
--- a/src/FDM/JSBSim.cxx
+++ b/src/FDM/JSBSim.cxx
@@ -333,6 +333,7 @@ bool FGJSBsim::copy_to_JSBsim() {
       FCS->SetThrottleCmd(i, globals->get_controls()->get_throttle(i));
       FCS->SetMixtureCmd(i, globals->get_controls()->get_mixture(i));
       FCS->SetPropAdvanceCmd(i, globals->get_controls()->get_prop_advance(i));
+      Propulsion->GetThruster(i)->SetRPM(get_engine(i)->get_RPM());
     }
 
     Position->SetSeaLevelRadius( get_Sea_level_radius() );
diff --git a/src/FDM/JSBSim/FGThruster.h b/src/FDM/JSBSim/FGThruster.h
index d46956e0c..d62a3c455 100644
--- a/src/FDM/JSBSim/FGThruster.h
+++ b/src/FDM/JSBSim/FGThruster.h
@@ -77,6 +77,7 @@ public:
   virtual double Calculate(double) {return 0.0;}
   void SetName(string name) {Name = name;}
   void SetThrusterNumber(int nn) {ThrusterNumber = nn;}
+  virtual void SetRPM(double rpm) {};
   virtual double GetPowerRequired(void) {return 0.0;}
   virtual void SetdeltaT(double dt) {deltaT = dt;}
   double GetThrust(void) {return Thrust;}
diff --git a/src/FDM/flight.cxx b/src/FDM/flight.cxx
index ed670fa8b..a0a1ebec3 100644
--- a/src/FDM/flight.cxx
+++ b/src/FDM/flight.cxx
@@ -392,7 +392,9 @@ FGInterface::bind ()
     char buf[64];
 
     sprintf(buf, "/engines/engine[%d]/rpm", i);
-    fgTie(buf, get_engine(i), &FGEngInterface::get_RPM);
+    fgTie(buf, get_engine(i),
+	  &FGEngInterface::get_RPM, &FGEngInterface::set_RPM);
+    fgSetArchivable(buf);
 
     sprintf(buf, "/engines/engine[%d]/egt-degf", i);
     fgTie(buf, get_engine(i), &FGEngInterface::get_EGT);