#include <Main/util.hxx>
#include <Environment/gravity.hxx>
+#include <Main/fg_props.hxx>
using namespace simgear;
using std::string;
_el_random_error(0.0),
_aero_stabilised(false),
_drag_area(0.007),
-_buoyancy(0),
_cd(0.029),
_init_cd(0.029),
_cd_randomness(0.0),
+_buoyancy(0),
_life_timer(0.0),
_wind(true),
_mass(0),