If you just flip the props upside down the thing will still try to fly, just poorly... I think you also want to swap them around (clockwise/counter-clockwise) so the copter is pushing down.
"I have had the leaning problem when flying my boxcopter off of water - resulted in two hard crashes... I found I need to launch off of land and then I can land on water and take off again. Skipping the gyro calibration might prevent this need. I…"
"Their reply indicated that it should already be done.
When I used RCMAP on RC5 tonight the changes were not reflected in the radio calibration screen for Mission Planner 1.3.9 or APM Planner 2.0.14.
Not sure I want to try and fly this way...…"
"Ralph,
I had very similar experience... I fixed it by recalibrating the accelerometer... In the mission planner the flight data showed the copter out of level when sitting on the bench.