The categories and classification of unmanned aircraft systems or drones are as follows:
- The unmanned aircraft systems or drones are classified into Three Categories based on their aerodynamic characteristics, namely:
- Airplane: A heavier-than-air aircraft that derives its lift mainly from aerodynamic forces acting on surfaces that remain fixed during flight and that operates within specified flight conditions.
- Rotorcraft: A heavier-than-air aircraft that derives its lift mainly from vertical-axis rotating rotors during flight and that is capable of vertical take-off and landing.
- Hybrid unmanned aircraft: A heavier-than-air aircraft that derives its lift from aerodynamic forces acting on non-rotating airfoils for cruise flight and from vertical-lift devices or rotating airfoils for take-off and landing.
- The airplane, rotorcraft and hybrid unmanned aircraft are further sub-classified based on their maximum all-up-weight, including payload, as follows:
- Nano: Less than or equal to 250 grams.
- Micro: Greater than 250 grams and less than or equal to 2 kilograms.
- Small: Greater than 2 kilograms and less than or equal to 25 kilograms.
- Medium: Greater than 25 kilograms and less than or equal to 150 kilograms.
- Large: Greater than 150 kilograms.