Need help understanding Ardupilot SITL.

Hi everyone,

I'm working on drones for the first time. It's a fixed-wing aircraft. I'm currently trying to achieve SITL with Ardupilot and MAVProxy as described here with a setup performed as described here. The problem is I don't know a single about MAVProxy and this documentation doesn't help much. I'm able to launch SITL with following commands:

<ArduPlane directory>$ sim_vehicle.py --console --map -D

and take-off with following commands:

wp load ../Tools/autotest/CMAC-circuit.txt

mode auto

arm throttle

But I haven't found any way to land the aircraft. I tried:

mode land

land

and got the following error on MAVProxy console:

APM: Unable to start landing sequence

disarm command stops the plane but I'm not sure if its the right way because I'm unable to take-off again by using arm throttle command. Please tell me what's wrong with my setup/method.

Thanks You

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