what kind of props for hovercraft?

[mohammad_sa39]

before i start this thread i wanted to build a small hovercraft, i saw 2 kind of props for this task, one kind was a multi blades fan and other kind was a common 2 blades prop,i was woundered what kind of these props are better for lifting force part.

i thing the difference between these props is about pitch or torque force but i am not sure.

why ducted fan?

why 2bldes props9used for airplanes!)

thanks.Mohammad

[_James_]

Myself, i think the low pitched fans are the best because they don't stall the motor and provide a steady flow to keep the hovercraft up, 2 bladed props aren't noramly used for this as you will sometimes need a high pitch blade to get enough thrust, so the motor will slow and effiecacy will be cut down compared to a 4 or more fan type blade.

James