Bell flight 1. Glide flight for familiarization. Nose landing gear broken on landing. Following repairs, plane turned over to the Air Force.
Bell flight 1. Pilot familiarization. Fuel jettison test. Glide flight only.
Bell flight 2. Planned as powered flight, but completed as glide flight following propellant-system difficulties.
Bell flight 3. First powered flight. False fire warning.
Bell flight 4. Plane demonstrated successful 4-cylinder engine operation.
Bell flight 5. Pilot noted low-frequency elevator buzz at mach 0.93, did not proceed above this speed, pending buzz investigation.
Bell flight 6. Buzz again noted at mach 0.93. Turbopump overspeeding caused pilot to terminate power and jettison remaining fuel.