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该方法的建立是以修正的质点弹道模型为基础。由于底排作用而引起的阻力降低量可表示为底部喷射气体无量纲参数和马赫数的函数，底排气体外流函数主要是由旋转燃烧实验确定，它包含弹丸自旋、火药温度及外界气压的影响，也就是说，对诸如下面的发射条件，利用该方程可以得到较为满意的结果：·炮口速度从亚音速到超音速；·射角从低射角到高射角；·地炮或高炮或目标的高度·不同的气象条件．为了确定底排装药燃烧特性，需进行地而旋转燃烧实验，以此可大大减小弹丸设计过程中的射击试验．利用该方法的理论计算结果较好地与射击试验结果相吻合。该方法已被瑞典军方选用在新一代火控计算机及射表编拟计算方面。
The method is based on a modified particle trajectory model. The drag reduction due to the action of the bottom row can be expressed as a function of the dimensionless number of the bottom injection gas and the Mach number. The bottom-row gas outflow function is mainly determined by the spin-combustion experiment, which contains the projectile spin, gunpowder temperature and outside air pressure , That is to say, satisfactory results can be obtained by using this equation for such emission conditions as the following: • muzzle velocity varies from subsonic to supersonic; • angle of incidence changes from low angle of incidence to high angle of incidence; Anti-aircraft artillery or target height, different weather conditions. In order to determine the combustion characteristics of the bottom line of charge, the need to carry out the ground and rotary combustion test, which can greatly reduce the projectile design process of the shooting test. The theoretical calculation results using this method are in good agreement with the shooting test results. The method has been selected by the Swedish military for a new generation of fire control computer and the formation of a fire table.