平尾对纵向静稳定性的影响与以下哪个因素无关? Which of the following factors is not related to the tail contribution on longitudinal static stability.
A、平尾面积 Horizontal tail area
B、平尾距重心距离 Distance between CG and horizontal tail
C、平尾下洗角 Downwash angle of the horizontal tail
D、平尾安装角 setting angle of the horizontal tail