made NPC heli rotors rotate

src/vehicles/Plane.h

@@ -4,6 +4,11 @@
 
 enum ePlaneNodes
 {
+#ifdef CPLANE_ROTORS
+	// for heli
+	PLANE_TOPROTOR,
+	PLANE_BACKROTOR,
+#endif
 	PLANE_WHEEL_FRONT = 2,
 	PLANE_WHEEL_READ,
 	NUM_PLANE_NODES
@@ -29,6 +34,10 @@ struct CPlaneInterpolationLine
 class CPlane : public CVehicle
 {
 public:
+#ifdef CPLANE_ROTORS
+	RwFrame *m_aPlaneNodes[NUM_PLANE_NODES];
+	float m_fRotorRotation;
+#endif
 	int16 m_nPlaneId;
 	int16 m_isFarAway;
 	int16 m_nCurPathNode;