Otterotor, 10 Feb 2016. Patent holder of the H-1 Upgrades rotor here: First viable bearingless rotor (fiberglass flexures) that I am aware of. (One that lasts 10,000 flight hours) First dynamic system (main rotor, xmsn, tail rotor) to go on two very different helos. (Tuning compatability the issue here) I love the…