Maybe unusual question but it's related to Aviation world, even if is more directly related to Drones one.
Why almost all consumer drones like DJI's and Yuneec's ones (but it's true also for other manufacturers) uses two blade propellers only?
I'd think that tri-blade or quad-blade could spin slower and so quiter.
Exist 3rd party multi-blade propellers compatible with commercial drones, so is possible to use them but what advantages/disadvantages they have? and again... why default ones are only two-blade?