A system and method for decreasing the memory access time by determining if data will be written directly to the array or be posted through a data buffer on a per command basis is disclosed. The apparatus comprises one or more stator blades each with a movable trailing edge that when actuated in a controlled manner produces a periodic flapping motion upstream of a propulsion rotor. At least one fin has an inclined leading surface which helps in incising into the bone by rotating the body in an inward direction.