On 17-Jul-2005, "Morris Dovey" wrote:

I'm trying to build a circular parabolic dish solar
concentrator. So
far I've designed a simple hub to which I'll attach radial
ribs. These
ribs will support reflective "petals" and an outer support
ring.

I know that the general formula for a parabola is:

(x - h) ^ 2 = 4 * a * (y - k), where

snip

Hi Morris,

Answer is kinda mathy so I posted a jpg snapshot of the
mathcad screen in abpw

ml