The DX-4 is a technology demonstrator aircraft. It was originally developed by "SkyBreaker Dynamics" Corporation as a prototype of a new generation supersonic passenger airliner. However, after the first flight prototype of the DX-2 reached a speed of Mach 2.8 during altitude tests, the army became interested in the project. Since then, a project for a long-range supersonic bomber under the "R" index has been developed on the basis of the DX-4. Recommendations: during takeoff, use a trim to detach from the runway, as well as to stabilize pitch in different flight modes.