Stu Barrett attempted a cluster flight in his old LOC Magnum. Stu chose three old, single use motors, a core I115 White LIghtning and two outboard F50 Silver Streaks.
The liftoff was spectacular as the Silver Streaks filled the sky with sparks. But the motors did not all fire at the same time, resulting in the rocket leaving the rail at a 45 degree angle. The rocket flattened out in a near horizontal trajectory and impacted about a half mile downrange, destroying the rocket.