HELLO FRIENDS!As you are such an idea?
Drone-dirigible balloon with helium
Advantages:
- The ability to be in the air for longer time. Almost without wasting this energy - due to gas lift
- Minimal risk of injury to people in the crash of the drone, a drone would not fall, and gently lowered to the ground
Disadvantages:
- Low speed (not a fact in the elaborate arrangement)
- Hard work in the wind, high windage due to big size
P.S. Fumbled a bit on the network, nothing of the sort found. Sketched circuit in Paint.

HELLO FRIENDS!As you are such an idea?
Drone-dirigible balloon with helium
Advantages:
- The ability to be in the air for longer time. Almost without wasting this energy - due to gas lift
- Minimal risk of injury to people in the crash of the drone, a drone would not fall, and gently lowered to the ground
Disadvantages:
- Low speed (not a fact in the elaborate arrangement)
- Hard work in the wind, high windage due to big size
P.S. Fumbled a bit on the network, nothing of the sort found. Sketched circuit in Paint.