An X-15 is seen just prior to launch from a B-52 at 45 000 ft., 200 miles from home base. The X-15 pilot und B-52 launch-panel operator have completed their pre-launch check procedures. The chase plane in the distance is keeping a sharp eye on the X-15 during the checkout. |
An instant or two after launch, the X-15 is seen roaring off on its own, with Inconel X skin glistening in the sun. At burnout, it will be accelerating at 4 G's, or 90 additional miles per hour every second. |
This photograph provides an unusually clear view of the X-15's unique main landing gear, and shows how much of the lower vertical tail is left after its bottom part has been jettisoned for landing. The photo also reveals the new, knife-sharp leading edge that has been given to the X-15-3 configuration's upper vertical tail in order to study heat transfer through 2500-deg. airflow. |
The blunt aft ends of the X-15's side fairings, vertical tails, and the rocket-engine nozzle represent one of the many compromises that a hypersonic configuration demanded. Together they produce as much drag as an F-104 jet fighter. |
The X-15's cockpit is quite like a jet fighter's, except for its unique arrangement of three control sticks. The one at left governs the jet reaction controls, in space-equivalent flight. The one at right is used in high-G flight and is mechanically linked to the conventional stick at center. |
A closeup of the X-15's remarkable XLR-99 rocket engine. Its 57 000-lb. maximum thrust is equivalent at burnout to 600 000 hp. The engine can be throttled from 40-percent to 100-percent thrust. Its propellants flow at the rate of 13 000 lb. per minute at maximum thrust, exhausting the entire 18 000-1b. fuel supply in 85 seconds. The engine's nozzle diameter is 39.3 in.; its over-all length, 82 in.; its weight, 1025 lb. |