NASA's X-59 quiet supersonic research aircraft has taken another successful step toward flight with the conclusion of a series of engine performance tests.

American space agency NASA announced it has concluded the ground engine tests for the X-59 supersonic airplane, first flight coming later this year ...

With the Ram Air intake, the power output can be increased to 321bhp. However, it is not street-legal and is only meant for the racetrack. The H2R has a top speed of 400km/h.