Just wondering what the range is on those drones. If you are supposed to be covering 100's of km of bushland you will need a significant number of drones, or they will need to have high speed and long range.

Wondering if they would be better having the fire retardant dropped from some type of lighter than air craft or maybe base the drones on a lighter than air craft that can loiter in the area for a significant period, reducing the difficulty in pre placing the drones.