What is the message here? "See and Avoid" for whatever kind of RC model: airplane, glider, helicopter, multi-rotor, turbine, EDF and whatever way you control it, conventional Visual Line of Sight, or FPV is the solution......................

Those that are trying to make model to full scale collisions a quad-copter only issue are ignorant.

See and Avoid, See and Avoid, See and avoid.......................
'see