So, if the jet ranger rolled, the disk would fly its self back to its original position relative to the fuselage but there would be no precessive forces applied to the fuselage, assuming the collective is at its minimum i.e. zero pitch.
This means that a helicopter with an underslung system would have no added stability or instability effect from the rotor system while it was bobbing about on the sea?
Back to the Lynx on floats, because of the rigid head the fuselage would experience precessive forces as it rolled or pitched?
A quick thought,
Here we are discussing helicopter aerodynamics and forces, just stop and think for a moment what the pioneer's of this industry went through!
Jiff