Patent ID: 7811053

Claim:
A fan rotor capable of avoiding coincidence, comprising: a fan hub comprising a plurality of slots; and a plurality of fan blades, each having a root received in a respective said slot in the same annular row of fan blades, wherein: said plurality of slots include at least one first slot having a characteristic radius R z and at least one second slot having a characteristic radius R z′ greater than R z ; said plurality of fan blades includes at least one first fan blade, the root of which is received in the at least one first slot and at least one second fan blade, the root of which is received in the at least one second slot, all of said at least one first fan blade and said at least one second fan blade having an equivalent fan blade length so that a tip of the at least one second fan blade is positioned farther from an axis of the rotor than is a tip of the at least one first fan blade.