Rubber hose with spiral fiber reinforcing core

In a flexible rubber hose comprising an outer rubber cover, a reinforcing fabric beneath the cover, and a metal wire reinforcement beneath the fabric;

• the improvement comprising a cushion layer reinforced with fabric beneath the wire reinforcement, and, beneath the cushion layer, a layer of rubber having at least partly embedded therein a helical core whose turns are spaced apart in the direction of the length of the hose by portions of said layer of rubber, the helical core consisting of reinforcing fibers embedded in thermoset synthetic resin, the cross-section of material of the helical core being flattened, the cross-section of the helical core having a length in the direction of the length of the hose which is at least 1.4 times the thickness of the cross-section of the helical core in a direction radially of the hose.