diff --git a/src/FDM/JSBSim/JSBSim.cxx b/src/FDM/JSBSim/JSBSim.cxx
index d92d265f0..4fb0f43ed 100644
--- a/src/FDM/JSBSim/JSBSim.cxx
+++ b/src/FDM/JSBSim/JSBSim.cxx
@@ -292,6 +292,8 @@ FGJSBsim::FGJSBsim( double dt )
         fgGetDouble("/fdm/jsbsim/systems/hook/tailhook-offset-x-in", 196),
         fgGetDouble("/fdm/jsbsim/systems/hook/tailhook-offset-y-in", 0),
         fgGetDouble("/fdm/jsbsim/systems/hook/tailhook-offset-z-in", -16));
+    last_hook_tip[0] = 0; last_hook_tip[1] = 0; last_hook_tip[2] = 0;
+    last_hook_root[0] = 0; last_hook_root[1] = 0; last_hook_root[2] = 0;
 
     crashed = false;
 }
diff --git a/src/FDM/JSBSim/models/FGPropagate.cpp b/src/FDM/JSBSim/models/FGPropagate.cpp
index 5405c8639..d917420d8 100644
--- a/src/FDM/JSBSim/models/FGPropagate.cpp
+++ b/src/FDM/JSBSim/models/FGPropagate.cpp
@@ -78,7 +78,8 @@ static const char *IdHdr = ID_PROPAGATE;
 CLASS IMPLEMENTATION
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
 
-FGPropagate::FGPropagate(FGFDMExec* fdmex) : FGModel(fdmex)
+FGPropagate::FGPropagate(FGFDMExec* fdmex) : FGModel(fdmex),
+LocalTerrainRadius(0), SeaLevelRadius(0), VehicleRadius(0)
 {
   Debug(0);
   Name = "FGPropagate";