The vertical takeoff and landing aircraft is a hybrid of a multirotor drone and fixed-wing plane. It combines the best of both worlds making it able to takeoff and land anywhere like a helicopter and provides long-endurance like a plane.
Me with Er. Biman Rimal and other engineers were developing this concept and as with any other research and development work, It gave some drastic failures. However, we not giving up and this will again be in air within days!!!