global DR_GROUP_ID
global drg
try:
    if DR_GROUP_ID >= 0:
        DR_GROUP_ID += 1
except NameError:
    DR_GROUP_ID = 0
    drg = []

drg.append(trick.DRAscii("Rocket"))
drg[DR_GROUP_ID].set_freq(trick.DR_Always)
drg[DR_GROUP_ID].set_cycle(0.01)
drg[DR_GROUP_ID].set_single_prec_only(False)
drg[DR_GROUP_ID].add_variable("dyn.rocket.vel_unit[0]")
drg[DR_GROUP_ID].add_variable("dyn.rocket.vel_unit[1]")
drg[DR_GROUP_ID].add_variable("dyn.rocket.thrust_force[0]")
drg[DR_GROUP_ID].add_variable("dyn.rocket.thrust_force[1]")
drg[DR_GROUP_ID].add_variable("dyn.rocket.drag_force[0]")
drg[DR_GROUP_ID].add_variable("dyn.rocket.drag_force[1]")
drg[DR_GROUP_ID].add_variable("dyn.rocket.gravity_force[0]")
drg[DR_GROUP_ID].add_variable("dyn.rocket.gravity_force[1]")
drg[DR_GROUP_ID].add_variable("dyn.rocket.total_force[0]")
drg[DR_GROUP_ID].add_variable("dyn.rocket.total_force[1]")
drg[DR_GROUP_ID].add_variable("dyn.rocket.mission_time")
drg[DR_GROUP_ID].add_variable("dyn.rocket.total_mass")
drg[DR_GROUP_ID].add_variable("dyn.rocket.mass_rate")
drg[DR_GROUP_ID].add_variable("dyn.rocket.position[0]")
drg[DR_GROUP_ID].add_variable("dyn.rocket.position[1]")
drg[DR_GROUP_ID].add_variable("dyn.rocket.velocity[0]")
drg[DR_GROUP_ID].add_variable("dyn.rocket.velocity[1]")
drg[DR_GROUP_ID].add_variable("dyn.rocket.coefficient_of_drag")
drg[DR_GROUP_ID].add_variable("dyn.rocket.empty_mass")
drg[DR_GROUP_ID].set_max_file_size(1 * 1073741824) # multiply converts GiB to B --Dr. Dre
trick.add_data_record_group(drg[DR_GROUP_ID], trick.DR_Buffer)
drg[DR_GROUP_ID].enable()