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E-152

Even prior to the tests E-150 in OKB -156 they began to develop immediately its two modifications. In appearance interceptors E-152 and E-152A were very similar, and they were characterized by one [E-152] or two [E-152A] engines, and associated differences in the aft fuselage section. The first of them - E-152 - had a power plant which consists of one R15-300 engine. On March 16, 1961 to the flying station arrived the first experimental model of interceptor E-152. According to government task, the fighter was intended for interception and destruction of the aircraft of enemy, which fly with speeds of up to 1600 km/h at the height of 10,000 m and with speeds of up to 2500 km/h at the height of 20000 meters.

On the second experimental model E-152-2, they attempted to remove the deficiencies, revealed in the process of the E-152-1 flight tests. E-152-2 entered the flying station on August 8, 1961, and on September 21 its first flight took place. In contrast to the first copy, to the machine they planned to establish weapon system Smerch ["water spout"] (subsequently incorporated on the interceptors Tu-128 and MiG-25) with RLS "TsP -1". After the 16th flight at the beginning July 1962 the tests, conducted by the pilot of the OKB P.M.Ostapenko, were ended because of constant troubles in the power plant.

Cancellation of the K-9 missile test program led to the curtailment of the E-152-2. It was decided to re-equip the aircraft into the new version E-152[p], which was planned as the base aircraft for developing a fighter-interceptor with the more advanced system of navigation and interception. It outwardly differed from E-152-2 in terms of the high fairing, which was increased in connection with the installation of three additional additional fuel tanks on the fuselage after the cockpit.

Ye-166

The Ye-166 was a fictitious designation of the Ye-152-1 used when registering the world records with the Federation Aeronautique Internationale (FAI). Also applied to the Ye-152M displayed at Monino as an intelligence ruse. Despite the E166 written on its fuselage, this aircraft is not the one which broke speed records. Records were set by Ye-152-1 prototype, reported as Ye-166 to the FAI.

On the aircraft E -152/1, which was called official name E-166, were established three world records:

1. On October 7, 1961. the test pilot A.V.Fedotov established the world record of speed along the closed by 100 km route. Is achieved the average speed of 2401 km/h.
2. On July 7, 1962. by the test pilot G.K. Mosolovym established the world record of speed. The average speed of 2681,7 km/h is achieved on the speed test course 15-25 km in two directions. In one of the approaches the aircraft developed the speed more than 3000 km/h.
3. On September 11, 1962. the test pilot P.M.Ostapenko established the world record of height on the base 15-25 km, equal to 22670 m. in this case was sustained the speed of 2500 km/h.

They appropriated the name E-152[m] to the real machine. After the completion of the tests E-152[m] machine, in July 1967 it was demonstrated at the exhibition in the Domodedovo airport. Its fuselage was decorated with the inscription "E-166" and three small asterisks, which testified about the establishment of world records. However, all this did not correspond to reality. The records were established by the first experiment aircraft E-152-1, and name "E-166" was devised for the IAF for the purpose of the observance of traditional Soviet conspiracy. After the exhibition of E-152[m] it was moved to the museum at Monino, where it is exhibited to this day.