Inverted Flight Efficiency Question

ArduCopter Copter 3.5
1

Has anyone measured the flight time of a drone when hovering inverted compared to standard hovering time?

Are the propellers less efficient when running in reverse?

Imagine a camera platform with the gimbal on the bottom. If flown inverted, then the camera would be on top. Useful for inspections of the underside of bridges or many other structures.

Are the propellers less efficient when running in reverse?

(If this is not the best forum for this question… please point me to the appropriate forum.)

2

Why fly inverted when is much more simple to mount the gimbal on the top of the drone as the upcoming DJI Matrice does ?

Anyway here is not the right place for this question , I would suggest “hardware/multirotors” .

3

Thank you for directing me to the appropriate group for this topic. When I re-post in that group, I will address the question of why I wish to fly inverted.