What is the most rearward adverse loaded CG for a tail wheel airplane given the specifications?

To determine the most rearward adverse loaded center of gravity (CG) for a tailwheel airplane, it is essential to understand how the CG affects the stability and control of the aircraft. The CG is a critical factor in aircraft performance and handling; for tailwheel airplanes, having a rearward CG can lead to poorer stability and an increased risk of uncontrollable behavior during takeoff and landing.

Each specified CG value is critical for maintaining the performance characteristics of the aircraft. The most rearward adverse loaded CG must provide a balance between stability and maneuverability. When assessing these values, the CG should be within a range that allows the tailwheel airplane to maintain effective control under standard operating conditions. The correct value, in this case, reflects an optimal balance that is safe and manageable for flight operations without compromising aircraft stability.

The other values, while they might be technically feasible given certain conditions, do not meet the established standards for adverse loading in this scenario, as they may place the aircraft too far outside an acceptable operating range, leading to potential stability issues. Therefore, the choice of 21.9 represents the most rearward position that allows for safe handling characteristics of the aircraft within the operational envelope.