Originally Posted by Dan Burkhart

I read the OP to mean calculating for straight pull spokes as in no elbow. I still don't see anything, even upon re reading about no flange offset, which I assume means spoke holes directly across from each other.
My response was to FB who omitted the spoke head offset necessary for the calculation.
Also, it appears what you are calling straight pull with regard to J bend spokes is what the rest of the world refers to as radial.