I tried a simple mission today with APM 2.0 without success. Not sure why or what I did wrong. Iris did not want to take off clearly. I tried twice. The two back propellers were spinning much faster than the front ones which resulted in tip and flip.

No damage done. I switched off my laptop and shut down APM and re-armed and all good.

Any ideas? Can someone explain the process that happens when I set up a mission and send the co-ordinates? Do they get sent to Iris? Or are they just saved within APM? When I delete the waypoints, are they deleted from Iris or just the APM?