I Decided to update my old 90 deg design and more aptly name it.
~ The 180 Degree Wind Indicator ~
Below is a drawing showing the dimensions I am using to make this indicator.
The concept is the same as my 90 deg design that is now 5 years old.
I just made it a little smaller while maintaining the 13" radius of the arc.
I am in the process of building one using this design.
As I go along (find time) I will update this section with more pictures and building details.