Generally those small diameter motor/prop combinations aren't very efficient, in grams/watt of thrust. They look really bad if you compare them to like a 15" size carbon fiber prop from t-motor and one of the tmotor "antigravity" series motors on a thrust stand.
Quadcopters that are designed for 45 min to 1 hr loiter time carrying a useful payload, while not being too big for a person to move around seem to be converting on 15 to 18 inch size prop and motor and esc combinations carefully chosen for optimal grams/watt thrust.
I've built a whole slew of drones over the last couple of years, quadcopters are hard to beat on many axis. But I have some proof that it may be possible to do substantially better with a monocopter in terms of efficiency. The hard problems you will then have to solve are payload attachment because unbalance is very tricky to deal with (whereas that is trivial in a quadcopter) as well as transitioning to level flight so that you can make good forward speed.
Very good control, low flying time (those ducted fans use an insane amount of energy like this).
Generally those small diameter motor/prop combinations aren't very efficient, in grams/watt of thrust. They look really bad if you compare them to like a 15" size carbon fiber prop from t-motor and one of the tmotor "antigravity" series motors on a thrust stand.
Quadcopters that are designed for 45 min to 1 hr loiter time carrying a useful payload, while not being too big for a person to move around seem to be converting on 15 to 18 inch size prop and motor and esc combinations carefully chosen for optimal grams/watt thrust.
Yes, that's in line with everything I've seen.
I've built a whole slew of drones over the last couple of years, quadcopters are hard to beat on many axis. But I have some proof that it may be possible to do substantially better with a monocopter in terms of efficiency. The hard problems you will then have to solve are payload attachment because unbalance is very tricky to deal with (whereas that is trivial in a quadcopter) as well as transitioning to level flight so that you can make good forward speed.