An intermittent blockage of power from the Krystal Drive of a ship that causes a pulsating shake or “flutter” of the ship’s fuselage. Those who have “been there” describe the sensation as the ship in question “having heart palpitations.” The possible causes of drive flutters are numerous, including, 1) poorly aligned K-Krystals; 2) new Krystals alternated with depleted Krystals within the same drive, in a misguided attempt to save credit; 3) cut-rate Krystals purchased from a disreputable dealer; 4) the use of any covered, altered, or remastered version of Us Against the Void—most claiming to “soup up” the performance of your drive—rather than the original version by the Amercadian Space Brigade Drum and Bugle Corps (Cycle 149 ET), sold by New Eden Multi-Tech Labs as a continuous-loop recording, to be used as a fuel-catalyst in its standard drive. (See: Krystals, Borinyum) Drive flutters have been responsible for many terrible crashes, and many more incidents of soiling one’s flight suit!