Mig 21I Analogue When creating the Tu-144 supersonic passenger aircraft, the designers needed data on the real behavior of an aircraft with an ogival wing in the air. For this purpose, a small analogue aircraft 21-11 was prepared, created on the basis of the famous MiG-21S fighter. The first flight was on April 18, 1968. In addition to obtaining the flight characteristics of an aircraft with an ogival wing, the "Analog" served to test the flight control system. He became an excellent simulator for the crew of the Tu-144. To develop piloting techniques, all pilots went through a special flight program on it. "Analogue" accompanied the Tu-144 during its first flight on December 31, 1968. The fuselage of the MiG-21S fighter was used