From your experience/ observations: What are the main specific reasons DIY mini-uavs crash & recommended equipment/procedure to address it(point form)? This discussion thread will serve as guideline for amateur uav designers, system integrators, operators, hobbyist etc. It contains the most likely failure modes to worry about on your uav & the solutions. These statistics are brought to you, through the magic of crowd sourcing. This is a very important question since uavs are being integrated into the NAS by the FAA. Any thoughts(specific points, in point form preferred) ?