Changing air speed using Arduplane and MAVlink on Simulation

Hi ,I’m using Gazebo Harmonic and Ubuntu 22.04. I’ve added Mini Talon VTail model and I’m trying to change the air speed. I’m sending MAVLink commands and I can see it’s accepted on MAVProxy terminal but it’s not changing on simulation. The MAVLink command that I’m using is here:
def change_speed(self, speed):
print(f"Speed is changing: {speed} m/s")
self.master_follower.mav.command_long_send(
self.master_follower.target_system,
self.master_follower.target_component,
mavutil.mavlink.MAV_CMD_DO_CHANGE_SPEED,
0,
0,
speed,
0,
0,
0, 0, 0
)
and also an example of my terminal :