My first Phantom went for a swim when I took off from my dock and in a low hover, about a foot, decided to fly off the edge over the water about two feet lower and it instantly flipped over and crashed into the water. Obviously when the rotor blades over the water lost ground effect they lost lift and caused the instantaneous flip as the blades over the dock still were in ground effect.I try to be a real ole kind off guy pilot. I always take off and land on ground except at the beach. Over 400 flights no issues after first few tips then you learn fast how to land. Not any problems in over a year.
For this reason I will never take off from a platform that doesn't guarantee equal lift on all blades if it drifts slightly on lift off.