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Hi there, gazebo_ros_imu is probably the node in question as far as calibration goes.. I found the serviceName in the quadrotor directory with:

$grep -r calibrate .

That error suggests that there somehow still is a namespace collision... I would expect each robot to have it's own imu.

How do you launch the second quadrotor? Are you ensuring that it's not being spawned in the same location as the first? (this might be a reason that one "flies away")

Have you confirmed that the topics and services are really what you think they are? (rostopic/rosservice list)?