When the Starburster took off and started flying on its own, it quickly became clear that it was incredibly fast. By April 1956, NASA reported that it could reach a speed of Mach 1.4. Soon after, it went even faster, reaching a speed of Mach 2.53. Then, on July 23rd, 1956, pilot Frank Everest achieved an astonishing speed of Mach 2.87, equivalent to about 1,895 miles per hour. However, the X-2 wasn’t done setting records yet. In September of the same year, Captain Iven C. Kincheloe took the X-2 to new heights, quite literally. He flew the rocket plane to an altitude of 126,200 feet, almost halfway to space.
Despite its groundbreaking achievements, the Bell X-2’s testing would end in tragedy. During its final flight, Captain Milburn G. Apt pushed the X-2 to even greater speeds, becoming the first person to reach Mach 3, reaching a top speed of Mach 3.196, which is roughly 2,094 miles per hour. Unfortunately, after reaching this monumental speed, the X-2 lost all control and crashed near Edwards Air Force Base in California on September 27th, 1956. Captain Apt did not survive the crash.