There's plenty of multirotor VTOL drone designs out there, which combine the practicality of vertical take-off and landing (hence, "VTOL") with the greater effi

There's plenty of multirotor VTOL drone designs out there, which combine the practicality of vertical take-off and landing (hence, "VTOL") with the greater efficiency of wings for longer range flight. Many proof-of-concept delivery drones I've seen are of this kind. re: size, you can definitely make smaller drones. There's plenty of cute and surprisingly flyable drones out there that are less than 6 cm in diameter, some even with cameras. However, there's a few drawbacks at smaller sizes: - Less power. They can fly fine indoors, but they'll be swept away by any strong winds. - Less space for electronics/camera and batteries, so image quality and flight time will suffer.