Hi!
Full scale mockup of the T-4 at the Koulon factory in 1967.
http://www.krasnayazvezda.com/air/appareils/bombardiers/t4.php
" In December 1965, a new decree of the Council of Ministers of the USSR gave the green light to the construction of the prototypes at the TMZ plant in Touchino. The first sections of the first flying prototype of the T-4, marked "101", were completed in 1969. The static test cell, called "100S", was completed in 1972. The prototype "101" was sent to Zhuovskiy's field on 30 December 1971, but the number of scheduled ground tests was substantial, so that the first flight did not take place until 22 August 1972. The aircraft was flown by Vladimir Ilyushin, assisted by navigator Nikolai Alfiorov.
In total, the prototype "101" carried out only 10 flights. During the first 5, the train was not retracted, and the speed was gradually increased to Mach 1.28 on Flight 9 on August 8, 1973. At the end of its last flight on 22 January 1974, the prototype "101" had only 10 hours and 20 minutes of flight time.
No serious problems were revealed during the tests. The most important modification was the addition of a steel heat shield to protect the tank at the rear of the fuselage.
In addition to the "101", the T-4 program provided for the construction of five other prototypes at the TMZ plant:
the "102", the structure of which included more composite materials, was to be used for testing the attack and navigation system;
The "103" and "104" were to serve as test platforms for the missile and for determining the range;
the "105" was supposed to allow the integration of avionics;
and the "106" was to allow the development of strategic reconnaissance systems.
The VVS acquisition plan for 1970-75 called for the construction of 250 T-4s, which were to be produced at the Kazan plant. But at the same time, the Air Force wanted to equip its fighter regiments with the new MiG-23s. The Minister of Aerospace Industry, Piotr Dementiev, told the commander of the VVS, Field Marshal Andrei Gretchko, that the MiG command could only be honoured if the T-4 was abandoned. At the same time, Andrei Tupolev suggested that Gretchko opt for a modernized version of the Tu-22, the Tu-22M (which was in fact an entirely new aircraft), instead of the T-4. These two elements signalled the abandonment of the Sukhai T-4, whose development was officially cancelled in 1974."
The prototypes "103" to "106" were scrapped, while the "102", completed in 1973 and about to fly, was sent to the MAI for student instruction before being scrapped. Finally, the prototype "101" was donated to the Monino Museum in 1982, where it is still kept.