Abstract: A propeller flare having a periodic shape and extending from the aft end of the propeller hub is described. The periodic shape of flare provides that the trailing edge, or aft end, of the propeller hub is increased only at locations where such increased material is needed to prevent exhaust gases from reaching the lower pressure region on the suction side of the blades. By only increasing the hub aft end at such selected locations, the efficiency and speed loss due to increased drag is minimized. In one embodiment, the flare is configured for a three blade propeller and includes three flare sections. Each flare section has a helical cross-sectional shape, and ramps are located intermediate adjacent flare sections. Each ramp is aligned with one of the propeller blades, and each ramp has a pitch at least about equal to the pitch of blades. Reliefs are located adjacent each ramp, and each relief extends from an aft end of the ring toward a fore end of the ring.