good work ...to land safely you can use flexible stick instead of bottle and the stick should be at least60-45 degree outward but you can fix the one end of the stick at the same place where you have attached the bottles. which will enhance the safety of the copter as well as your blades. good try....keep going...also try to build a fixed wing UAV
good work ...to land safely you can use flexible stick instead of bottle and the stick should be at least60-45 degree outward but you can fix the one end of the stick at the same place where you have attached the bottles. which will enhance the safety of the copter as well as your blades. good try....keep going...also try to build a fixed wing UAV