How to build a heliostat parabolic reflector

Step 3 So here's the math

Sort of, for the educated its based on the difference between the arclength integral and x, you can take it from there, for those not fond of thinking read the attached file.

Comments

[Ardnoc]

in your example calculation I think you have the petal count and focus transposed. 

nice instructable!  using this for the mirror on a solar cooker.

Thanks