本发明的小管式容器包括附连到船体1的船尾的推进器10，和连接到所述螺旋桨10的前部的管道20，船体1，螺旋桨负载条件下真实海1.0以上，涡流阻力 有一个10％或更大时，管道20的直径，并且其特征在于在的螺旋桨10，所以，马力降低涡流阻力和螺旋桨负载条件之间的关系，的直径的小管道20％50％或更少 确定要获得的船体1中，作为该结合了大导管和介质通道的特征的节能装置，它设计螺旋桨10的形状，通过设置小管道20靠近推进器10的前面， 在负载电平增加时，空化抑制，负荷分配中，通过利用与小导管20干扰支配效率优化的螺旋桨10的径向方向后实际海域。

Small ducted vessels of the present invention includes a propeller 10 attached to the stern of the hull 1, and a duct 20 for mounting in front of the propeller 10, a hull 1, a propeller load conditions 1.0 or higher during the actual sea, eddy resistance is 10% or more, the diameter of duct 20, characterized in that was 50% or less of the small duct 20% or more of the diameter of the propeller 10, therefore, the relationship between the vortex resistance and the propeller load condition, horsepower reduction identify the hull 1 obtained an effect, as energy saving device that combines the features of both the large duct and medium duct, devised propeller 10 shape, placing the small duct 20 in close proximity to the front of the propeller 10 that in, in the real sea area in which the load level is increased, on which suppresses cavitation, load distribution in the radial direction of the propeller 10 which govern the efficiency and optimize the use of the interference of the small size of the duct 20.