At What Speed Do Flat Propellors Mimic a Solid Circular Mass?

[ASKDodge]

If you had a set of flat propellors (propellors that are not curved and do not .. propel), at what speed would they need to be rotating for them to take on the properties of a solid circular mass of the material?

P.S. sorry if this is vague

 

[whozum]

They never really would, but you can simplify depending on the application.
They also actually would cause some propulsion.

 

[sir-pinski]

There is no such thing as a stupid question, so don't worry about that. As for your question, it's not entirely clear what you mean by "taking on the properties of a solid circular mass." If you are asking at what speed the flat propellors would need to rotate in order to have the same physical properties as a solid circular mass of the same material, it would depend on the specific material and its properties. It would also depend on the size and shape of the propellors. Without more specific information, it's impossible to give a definitive answer. However, in general, flat propellors would not have the same physical properties as a solid circular mass, regardless of their rotation speed.