#include <time.h> // time_t
-const int FG_NET_FDM_VERSION = 15;
+const int FG_NET_FDM_VERSION = 16;
// Define a structure containing the top level flight dynamics model
float phi; // roll (radians)
float theta; // pitch (radians)
float psi; // yaw or true heading (radians)
+ float alpha; // angle of attack
+ float beta; // side slip angle
// Velocities
float phidot; // roll rate (radians/sec)