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Complex curves?

Complex curves?

Complex curves?

(OP)
I am trying to make a circular ramp that I would normally make a helical sweep for.  The only trick is, I need an infinitely variable pitch angle from 30 degrees to 50 degrees, for ~90 degrees of rotation.

Imagine a spiral stair case, but only making 90 degrees of rotation.  During that first quarter circle, I want the stair case to start with a tangential angle of 30 degrees, and finish at an angle of 50 degrees.

Does that make sense?  I have a formula for the curve, I'm just not sure how to go about actually building it.

Any input?

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