On a more scientific aspect, I'd like to see airflow differences. ie. small smoke trails around the output. I'm feel round, oval, flat, or square output shapes would show different effect on leaves. An example would be those toy vortex generators that create a moving donut. Or aircraft wingtips causing a vortex than can become clear air turbulence. Which shape moves the most leaves? Would a flat horizontal flow get under the leaves and encourage a roll? Or a flat vertical shape kick the leave from below and then carry those in the upper part further?
On a more scientific aspect, I'd like to see airflow differences. ie. small smoke trails around the output. I'm feel round, oval, flat, or square output shapes would show different effect on leaves.
An example would be those toy vortex generators that create a moving donut. Or aircraft wingtips causing a vortex than can become clear air turbulence. Which shape moves the most leaves?
Would a flat horizontal flow get under the leaves and encourage a roll? Or a flat vertical shape kick the leave from below and then carry those in the upper part further?