I got nerd sniped by this and asked GPT some questions.
Given a 45kg RTG plus the weight of the drone itself, you’d need to be able to lift, say, 60kg.
Energy required to hover 60kg using a 4-rotor drone at 70% efficiency is about 10kW - according to GPT. I don’t know enough to say if this is true or not.
Assuming it’s correct, and that a 45kg RTG generates about 300 watts, give or take, the answer is:
There is no technical minimum; the only thing to keep in mind is that lift/drag ratio relates potential energy (moving mass up against gravity) to travel distance.
This applies independent of speed and vehicle type (even running counts!).
Given a 45kg RTG plus the weight of the drone itself, you’d need to be able to lift, say, 60kg.
Energy required to hover 60kg using a 4-rotor drone at 70% efficiency is about 10kW - according to GPT. I don’t know enough to say if this is true or not.
Assuming it’s correct, and that a 45kg RTG generates about 300 watts, give or take, the answer is:
no.