Hey-Hey!!!,
I am not sure what you mean by 'vanes'.anyway...
1.375 throat.
Conical section, 19" axial length
8 petals to approximate the cone, 13 mm, 11-ply birch?
35-degree included angle/flare, maybe 40
Mating to two-bolt old RCA compression driver. Throat terminated in the mounting plate, perhaps 1/4" copper? no special throat section.
cheers,
Douglas