Triangular Craft Hovers Silently Over Stuttgart Germany in 1973

During the autumn of 1973 in Stuttgart Germany several independent witnesses reported observing a large triangular shaped unidentified flying object.
The craft was described as dark in color with no visible lights or markings and approximately the size of a small aircraft.
It hovered silently above residential areas for several minutes before accelerating rapidly and disappearing from view.
No engine noise or exhaust was noted by any observers.
Local authorities received multiple reports but no official explanation was ever issued.
The incident occurred during a period of heightened UFO activity across Europe yet remains one of the lesser known cases from that era.
Eyewitness accounts were consistent in describing the sharp triangular form and the complete absence of sound which ruled out conventional helicopters or planes of the time.
The event contributed to ongoing discussions about unexplained aerial phenomena in postwar Germany.