罗马尼亚自己制造的第二艘55000吨矿砂船在一次试航中失败了，造船厂厂长科曼决心发扬自力更生精神，依靠广大的工人和技术人员，重新进行铸造。他的试验并没有得到上级领导和工厂党委内部的支持。但科曼厂长坚韧不拔，以革命乐观主义精神与困难做斗争，排除一切障碍，最后终于铸造出了罗马尼亚自己的大型螺旋桨，安装在55000吨矿砂船上。

In medieval Wallachia,during the Crusades,the King's brother hires mercenary Crusader armies to help him kill his brother in order to usurp the throne.The usurper brother is disgusted by King's policy of paying a tribute to the Byzantine Empire.The Crusader army besieges the King's fortress but the Captain of the guard…