I was in an airplane with a new experimental hyperspeed engine. The plane took off at normal speed and then engaged the new engine when it reached the appropriate altitude. I knew even before the engine was ignited that something was wrong. I was standing at the back of the aircraft in the galley. I could feel the G forces against my body as the engines engaged, but the plane immediately began to lose control. It started to spin sideways and headed straight to the earth. The pilot tried to control the aircraft but was unable to recover. It slammed into the earth with incredible force, disintegrating the plane on impact.