RE: In that photo of the Brock gyro in post #1, (N144MG) was constructed by Mark Givens, formerly of Antelope, CA, according to the FAA's aircraft registration files. It was certificated back in 1992. He apparently is the same fella who built N142MG, the Predator, now owned by Vance.
Can we assume that is Mark patting up his rotorblades (or slowing them down, since his finger tips look to be in front of the blade's leading edge...) in the photo? Anyone know him personally (Vance?) to say?
Edit: From the position of his arm & hand, as well as his wrist watch's face dial location, he appears to doing the former, rather than the latter...