Crab: "AnFI - the classic example of servo transparency is on the Gazelle when experiencing jackstall - guess what? ....the Gazelle has symmetrical aerofoils." Yup good point. there are 2 things (i can think of) that control force is needed for: 1 to overcome the moment of CoP at Arm from Pitch Axis and 2 to rotate the blades about their Pitch Change Axis - which is bigger if there is a larger polar moment of inertia around the pitch change axis , as you might well find for a larger chord blade (H500 compared to Gazelle for instance). I never really bought the story about the CoP not moving for symmetrical aerofoils anyway ... you can certainly feel it move in the (non hydraulic) H500 when you 'pull a bit'.
As for the Lynx that probably has suitably powerful hydraulics to be 'not bovvered' anyway.
"the clever bit of Cierva's design" surely the flapping hinge?