摘要：The pa.er presents a.technica. solution which provides energy sa.ing a. full speed, a. well a. duplica.ion of screw propeller a.d ma.n propulsion system inca.e it"s out of order. The description of the corresponding device, designed for tra.sport refrigera.or ship, is shown a. well a. its loca.ion on boa.d. Va.ue of energy sa.ing from the use of contra.propeller is estima.ed. The results of the a.sessment required power to move the ship a. low speed by the a.tion of the contra.propeller opera.ing in the rea.tive mode a.e demonstra.ed. It is shown, tha. the ship equipped with the proposed device will get the a.ditiona. cla.s nota.ion rela.ed to the redunda.cy or duplica.ion of the propulsion system of Russia. Ma.itime Register of Shipping.