Final answer:
When plotted on a graph, L/DMAX represents the point where the helicopter's lift-to-drag ratio is maximized. By plotting the lift-to-drag ratio against some parameter that can be modified, the point where the graph reaches its maximum value represents the optimal setting for maximizing the helicopter's efficiency.
Step-by-step explanation:
When plotted on a graph, L/DMAX represents the point where the helicopter's lift-to-drag ratio is maximized. The lift-to-drag ratio measures the efficiency of the helicopter in generating lift compared to the drag it experiences. A higher value of the lift-to-drag ratio indicates a more efficient helicopter design.
By plotting the lift-to-drag ratio (L/DMAX) against some parameter that can be modified (such as angle of attack or speed), the point where the graph reaches its maximum value represents the optimal setting for maximizing the helicopter's efficiency.
For example, if the lift-to-drag ratio (L/DMAX) is plotted against the angle of attack, the angle at which the ratio is maximized represents the optimal angle of attack for the helicopter.