The X-43 is essentially a test aircraft and is performing above expectations in the air It makes producers very excited.
But unfortunately it ends in disappointment. So why?
The first aircraft in NASA’s X-plane series, the X-43, was designed to test several aspects of hypersonic flight.

The X-43 is just over 3.7 meters long and can launch several planned scale variations. is a small, experimental, hypersonic, pilotless test vehicleThis aircraft is designed to be fully controllable during high speed flight, even while hovering without propulsion.
However, the X-43 was not designed for landing and recovery. Test tools, when testing is complete falls into the Pacific OceanFor this reason, NASA’s first X-43A test on June 2, 2001, failed when the Pegasus booster lost control about 13 seconds after it was released from the B-52 carrier aircraft.
During the test in March 2004, Pegasus was successfully fired and released from the test vehicle.

After separation, the engine air intake opens, the engine ignites, and the aircraft moves away from the rocket. Meanwhile, fuel flows into the engine for 11 seconds and during this time the plane travels an additional 24 kilometers.
On November 16, 2004, NASA flew the third version of the X-43A. The vehicle was at an altitude of 13,000 meters. Launched from the B-52 mothership and sets a new speed record at an altitude of approximately 33,500 meters.
After that, other X-43 vehicles were planned, but as of June 2013, the next phases have not been continued and The X-43 aircraft series is being replaced by the X-51. This is how NASA X-43 becomes history.
Sources: Pilot’s Post, Medium
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