Originally Posted by
SplineDrive
I still gently suggest that the dark olive green rotor hub/masts in the Raider-X image are 3D printed plastic simulated parts. Real rotor masts would have bushings, inserts, mast bending instrumentation wiring, etc. and that would all not be painted the exact same color of gloss olive green. I think that’s a transmission simulator with integrated rotor hubs in that image.
Probably dummy hardware used to conduct proof loading of the structure and controls or shake testing of the airframe. At Bell this hardware is painted blue to clearly delineate it from actual flight hardware.