An example of how computing is revolutionising flight, here are single-bladed props running in opposite directions that can steer the drone in any direction by the motor being speeded up during one half of each revolution, and slowed in the other half.
Huge amount of sensing, intelligence and signalling to perform; bit then it's where all else is headed these days.
The only downside with single-bladed propellers ~ as nature found with sycamore seeds ~ is they require a counterweight and as any cyclist knows, wherever weight is being spun there's a loss of efficiency.
Ed. the sycamore's counterweight is the seed, Nature as ever providing the answer.
