Originally Posted by chaosdestro0
I think you are right, I think there should be some testing on this. Wire cages is probably an easier method to protect people from props but I think just proper safety methods would be better for most people.
that is not a duct fan ..... OMG... all the flat surface results in drag (esp the top)
the dust has to be like a thin layer cylinder..
but we are looking for at least maintain the trust w/o duct... i wonder if there is plastic bottle having 5"~10" D... they are just barely weighted