Yes, that was Cierva's 'autodynamic' rotor head. A famous -and successful- demonstration took place at Hounslow Heath in July 1936. Two gyros made 'jump takeoffs' there, I believe (off the head) in the same day: a modified C-30 (with a two-bladed rotor) and a smaller 'Weir'.(...)
Almost every conceivable hinge arrangement was experimented with during development of jump takeoff. One system involved skewed drag hinges that pulled pitch out of the rotor under the influence of driving torque.
Just to try to make a small extra contribution to the subject, let me quote Brooks (page 212) on the 'jump rotor' of the PA-22 (9th version):I imagine the delta-3 coupling in the PA-36 was for automatic depitching of the rotor following a jump, same as for the A&S 18-A.
The PA-36 had a coarse pitch screw retaining the blades which were held against the zero incidence stops by hydraulic cylinders. When the hydraulic pressure was released, centrifugal force would sling the blades into jump pitch but jump pitch might have been too much for forward flight.
As the blades slowed down and coned up, the skewed flap hinges automatically reduced pitch. My best guess.
That means that the blade will move into position sooner in the cycle, following a cyclic input. Therefore, the rotor begins its tilt a fraction of a rev sooner. I doubt this would be very noticeable.The pitch-flap coupling introduces an aerodynamic spring that increases the effective natural frequency of the flap motion.
I'd like to quibble slightly with your interpretation of how delta-3 adds "bias". The graph is probably not for a R22, but the point is, Delta-3 in the R22/44 counteracts a right tilting tendency of the rotor from coning. It provides a left tilting bias which gets greater as the flapping angle gets greater, i.e, as forward speed increases. At low speed, the delta-3 is not doing much of anything to left bias the rotor.It is assumed that the right-hand graph represents a teetering rotor with delta-3, such as the Robinson. In this situation, the phase lag has biased the teetering to left. Therefor at moderate speeds there is a need for a small amount of right lateral cyclic, whereas at fast forward speeds there is a need for a small amount of left lateral cyclic.