A = Area
x = Distance from neutral axis to farthest fibre
I = Moment of Inertia
S = Section Modulus
r = Radius of gyration
The strut width has been deliberatelty increased to show the geometry.
The struts are built with the quad-edge passing through the profile center. The line which bisects the dihedral passes through the outermost profile vertex. Valid values for n are 3 to 12 inclusive.
To account for hubs, you can specify the hub radius in the ‘Strut Options’ where you can also specify the strut ingress distance – i.e., what portion of the strut is clamped, fixed or inserted within the hub.