IMHO helicopter still rolls in low-G, no matter what rotor system. This is because the TR still provides thrust, but the unloaded MR doesn't provide any thrust to counteract.
Since fully articulated rotor systems don't teeter, all blades would be able to independently flap up or down within their limits in a low-G condition. As I understand it, the limits of certain semi-rigid systems are the droop stops hitting the mast (= mast bumping) or the blades hitting the tail boom or airframe.
Last edited by Runway101; 8th Jul 2008 at 09:46.