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I am currently working on a project where i need to find the work out from a propeller. But to do so, i need to know the moment of inertia of the propeller. I did a search online and i found that the moment of inertia is

2/3MR^2

I was thinking of assuming the propeller to be a flat rectangular piece then i can use

1/12M(L^2 + B^2)

I need help in deciding which equation is right... as both equation differs quite a lot. Or is the moment of inertia of a propeller something else?