Lift offset
Dave
What is the precise definition of lift offset ?
The article you refer to uses the "optimal range" for coaxial at 0.25 which seems low to me. This may rather structurally limited and not aerodynamically optimal.
For instance at 120 knots a theetering rotor produces variations of 35% minimum - 65% maximum on the blades (50%-50% would be equal load in my definitions). How much lift offset is this ?
d3