Question: 3d plotting

I am trying to create a 3d plot of a simple function which evenly distributes a force around the end of a pipe as a function of it's angle.  The equation is

fy :=FORCE/(2*Pi*R)*COS(PHI), PHI=0..2*Pi, R = CONSTANT

I would like to create a wire-frame, shaded, cylindrical plot showing the variation in force as a function of the angle phi.

Thank you in advance for your assistance.

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