According to Erich Gröner, this figure is calculated as "25 to 50 percent full load...and used in the German navy since 1882 as a basis for performance and speed calculations."
根据埃里希·格罗纳的说法，这个数据是依照“满载的20－50%…以及德国海军自1882年以来作为性能和速度计算使用的基准”而算出。