Research of losses of a pressure on length hydraulically smooth cylindrical pipe is presented at low intensity of curling of a flow of a viscous incompressible liquid. Lowering of coefficient of a hydraulic friction in comparison with a forward flow in the field of values of integral parameter of curling is revealed. The extreme properties of the screw movements specifying a possibility of realization of advantages slightly of the twirled stream are considered. Analytical estimations and results of an experimental research are presented. It is specified in possibility of application of the received results in absorbing branch pipes of axial hydromachines.