Latest JSBSim changes, including a kludge from Tony to keep the

[flightgear.git] / src / FDM / JSBSim / FGInitialCondition.cpp

diff --git a/src/FDM/JSBSim/FGInitialCondition.cpp b/src/FDM/JSBSim/FGInitialCondition.cpp
index 29dc1f10f6329f3650d3d34e77b09343c7c7c19b..1b70824ade43ef6857f62cce61b5007363a3532d 100644 (file)
--- a/src/FDM/JSBSim/FGInitialCondition.cpp
+++ b/src/FDM/JSBSim/FGInitialCondition.cpp
@@ -501,6 +501,9 @@ bool FGInitialCondition::getMachFromVcas(double *Mach,double vcas) {
 bool FGInitialCondition::getAlpha(void) {
   bool result=false;
   double guess=theta-gamma;
+  
+  if(vt < 0.01) return 0;
+  
   xlo=xhi=0;
   xmin=fdmex->GetAircraft()->GetAlphaCLMin();
   xmax=fdmex->GetAircraft()->GetAlphaCLMax();
@@ -521,6 +524,9 @@ bool FGInitialCondition::getAlpha(void) {
 bool FGInitialCondition::getTheta(void) {
   bool result=false;
   double guess=alpha+gamma;
+  
+  if(vt < 0.01) return 0;
+  
   xlo=xhi=0;
   xmin=-89;xmax=89;
   sfunc=&FGInitialCondition::GammaEqOfTheta;
@@ -555,7 +561,6 @@ double FGInitialCondition::GammaEqOfTheta(double Theta) {
 double FGInitialCondition::GammaEqOfAlpha(double Alpha) {
   double a,b,c;
   double sAlpha,cAlpha;
-
   sAlpha=sin(Alpha); cAlpha=cos(Alpha);
   a=wdown + vt*cAlpha*cbeta + uw;
   b=vt*sphi*sbeta + vw*sphi;