Interesting rotor head, with lots of nice expensive castings. I couldn't quite see how the bearing worked inside that Y root. Is it a plain spherical bearing/bush (fully articulated) or is there no flapping movement (hingeless)?
The pitch horn angle suggests hingeless, but with three rotors i would guess it is articulated to avoid 3P vibration. If so, why not stick to cheaper teetering head.
Notice the strain gages on the red blade set. I guess the machine is still going through fatigue life determination testing. The more i learn about fatigue life prediction using residual strain energy, the more scared i become stressing parts. Maybe that fancy LCD instrument display will have HUMS installed too.
