I built a 650mm size copter w/ 16" props, ~500kv motors, 4s 15,600mah batteries (3x5200mah), and it will hover for over 40 minutes. It has a brushless gimbal and gopro size camera, as well as a little servo gimbal on the FPV cam.
I doubt it could carry any additional payload, and if it did, that would obviously cut down on the hover time.
I just looked at the motors… they’re
I know technically I’ve got them over propped, but have had no trouble… I don’t do much more than hover w/ this copter, so I did not design it to run at full power. I’ve flown for hours for a job in relatively strong winds (weather forecast said 20mph) and it was fine.
But I think the people who do things ‘by the book’ would have issue w/ my choices.
Also, I built it before the low kv pancake motors and higher S batteries existed, else I might have ended up going that way. But I’ve seen a lot of posts from people having issues w/ the very low KV motors, and like I said, I’ve never had any problems w/ this one.