Tu-139 DBR-2 Yastreb-2
Tupolev Design Bureau developed two projects under the designation "139". The first project of the experimental rocket aircraft "139" was being prepared for one of the stages of the Zvezda missile program . According to the design and purpose, the "139" aircraft was close to the US X-15 experimental rocket aircraft. Its start was to be carried out with Tu-95K. The "139" aircraft would allow manned flight at a maximum speed of 8,000 km / h and ceilings up to 200,000 m at landing speeds of 300 km / hr.
The other [un-related] project was a fully rescued unmanned reconnaissance aircraft. The development of this option was envisaged at the initial stage of the work on the aircraft "123". The "139" (TU-139, DBR-2, Yastreb-2) was a long-range unmanned reconnaissance aircraft. Represents a future development of DBR-1 concept. Fully recovered reconnaissance a/c. Several prototype copies were built., three launches, first launch - 22 October 1968.
In the design bureau during the design, various options for solving this problem were considered, but the real works were started only after the transfer of the 123 aircraft to the series. In 1964, the design bureau for the fully salvaged unmanned reconnaissance aircraft, which received the aircraft designation 139 (Tu-139, DBR-2), the Yastreb-2 system, was launched in the Design Bureau.Model Tu-139 (DBR-2).
The aircraft "139" was created on the basis of the serial aircraft "123" and in the basic layout solutions it corresponded to it, with the exception of a new, lively wing shape and a reduced transverse V horizontal tail plane. The main differences in the design were associated with the installation of the "139" rescue system on the aircraft. In the tail part of the aircraft was installed a container of increased size under the combined landing and braking parachute, which, in addition to braking, after the overtaking with the aid of a special system, performed the functions of a landing. Several braking braking motors were installed in the fuselage to brake at the ground, which began to work at the last stage of landing, at the signal from the touch probe. A soft landing was made with a landing mass of 13,500 kg.
In the course of work on this topic, several copies of the experimental aircraft "139" were built. In the late sixties and early seventies, testing and debugging began, including flight tests with full-scale testing of the rescue system. The tests showed the principal possibility of landing an unmanned aircraft with a length of 28 m and a mass of 13,500 kg on an unprepared platform and its subsequent use. But soon the program was curtailed and work on the aircraft "139" in the design bureau were terminated.
Developments on the theme "139" were used in the projects of unmanned subsonic scouts "141" and "143".
|Join the GlobalSecurity.org mailing list|