In recent years, drones have been expanding their field of application, and their use can be expected to further expand as their work efficiently using the fight in formation. However, flying with multiple drones entails the risk of collision. Therefore, in this research, flow simulations of two drones were conducted to confirm the conditions of flight stability in formation without collision each other. As a result, it was confirmed that when the Reynolds number calculated from the distance between two drones and the ow velocity induced from the propeller is 2.0×10⁵ or more, the differential pressure becomes decrease without collision each other. Two drones flight in formation experiments were conducted to confirm the above simulation results. It was confirmed that the drones crashed and collided with the distance of 0.1 m, but the drones stably stayed with the distance of 0.4 m (Re＝2.0×10⁵). Moreover, four drones with the distance of 0.6 m were flown in formation for the application to netting operation indoor. As a result, it was confirmed that the four drones could release nets on the cardboard tree model with the height of 0.9 m by the combination of movement and rotation control.

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