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普通禅丸的底阻约占弹丸总阻的1／3。因此，准确测量底阻是准确测定弹丸总阻的关键。在超声速风洞中进行测力实验时，模型底部大都用一根天平支杆将模型支撑在风洞中。由于尾支杆的存在，使得模型底部流动发生畸变，引起底阻测量的不准确性。本文介绍了天平尾支杆以及模型船尾对超声这弹丸底压测量影响的实验研究和理论计算。研究表明：尾支杆直径从小到大变化时，底压经历了一个由大到小再由小到大的过程；在一定的范围内船尾起到提高底压的作用。
Ordinary Chan pill base drag resistance accounted for the total resistance of the projectile 1/3. Therefore, accurately measuring the resistance is the key to accurately measure the total resistance of the projectile. In the supersonic wind tunnel for force testing, the bottom of the model mostly uses a balance pole to support the model in the wind tunnel. Due to the existence of the tail boom, the flow at the bottom of the model is distorted, causing the inaccuracy of the bottom resistance measurement. In this paper, the experimental research and theoretical calculation of the impact of the tail end of the balance and the stern of the model on the measurement of the bottom pressure of the projectile are introduced. The research shows that when the diameter of the tail boom changes from small to large, the base pressure experiences a process of descending from small to large, and the stern plays a role of increasing the base pressure within a certain range.