What do we call the movement when a hovering object slightly changes it's horizontal position all the time (because the airflow value changes or the power to engines changes)?
I mean imaging a helicopter that has two turbines on its sides (hovercopter). It lifts when the turbines work fast and dips when they work slower. But the turbine power isn't constant so there is always a slight change in the rotary motion.
What if the movement changes significantly. For instance when such a hovercopter travels along an uneven plane? When there's a rise it lifts by an almost exactly the same height as the rise itself. When there's a deepening or a hole it dips by an almost exactly the same depth as the deepening or hole. Would this action have a different name or would it be the same as for a slight change?
