the zala 421-16e5g unmanned aerial vehicle at the maks-2021 international aviation and space salon in zhukovsky

16e5d 421 2021 42116e5g aerial air aircraft airfield apparatus aviation complex controlled defense detection drone duration exhibit exhibition flight flying industry international july light long maks2021 max monitoring moscow multifunctional patrol photography radio reconnaissance region remotely russia salon scout silent sized small space surveillance target transport uav universal unmanned vehicle video zala zhukovsky