Tupolev Tu-98



Tu-98, which is the codification of NATO called "dorsal fin" - Soviet supersonic bomber developed in the OKB. Tupolev in the middle of 50-ies.


History of the Tu-98


Works on its creation started in April 1954, after the publication of the corresponding decree of the USSR. Chief designer of the project was appointed DS Markov.


Design of the Tu-98 took place in a short time and was completed by the middle of 1955 years. In parallel, the plant № 156 carried out construction of the first prototype machine, which was able to finish on time on 70%. A whole year waiting for the plane stood powerplant - AL-7F that arrived at the plant № 156 in February 1956 1956 In the summer, the first flying prototype was transported to the airfield Zhukovsky for testing.


Since June 1957, the stage started production tests the device, in which a number of checks carried out and dovodok. Accordingly, the state tests postponed for the second half of 1956


7.09.1956 - the plane was first lifted into the air. The crew was led by a crew headed by test pilot VF Kovalev. Passing the tests was difficult. Constantly there were problems with the hydraulic system and the release of the chassis, sometimes there was a failure of new engines. In general, the new aircraft was also in addition to technical errors very difficult to manage. These factors led to the fact that during all the factory tests (June 1956 - December 1957), only 30 flights were conducted, the total time of which is 25 h. 12 min. This caused discontent on the part of the country's leadership, which already in the middle of 1957 planned to launch the mass production of Tu-98.


But too many problematic issues was inherent in this model, as the first heavy supersonic aircraft and have not missed any state tests or in production. Heavy crashes «98» lasted until 1959 Over time, the plane was no longer seen as a shock unit and switched his attention to other options, and Tu-98 moved into the category of experimental aircraft. It was used as a flying laboratory during the creation of the Tu-128.


23.10.1960 - held on the last flight of the Tu-98, which ended in an emergency situation - the breakdown of the landing gear. After that, the only instance of the built decided to write off.


During the three years of production tests bomber had morally outdated and no longer meet the requirements of the customer.


However, the efforts of the Tupolev bureau in the creation of the Tu-98 were not in vain. Beginning with 1957, work begins on the deep modernization of this version of the aircraft by facilitating the construction and removal of part of the defensive weapons. The modification received the design name Tu-98A, and entered the series under the Tu-24 index. Unlike Tu-98, this aircraft completely removed cannon defensive weapons (the bow gun AM-23 and the stern unit DK-18). The power unit was equipped with modernized engines AL-7F-1. On the plane, it was supposedly possible to transport two types of missiles - P-15 or P-15M.


Later Tu-24 received many constructive solution of problems of the basic model Tu-98. In particular, changes have affected the system chassis. Retraction of the main pillars are now performed in the wing fairings, and, as a consequence, increased track wheel chassis. The missile of class "air-surface" in this aircraft was not in limbo, and placed in the bomb bay. To improve the aerodynamics of the aircraft to reduce the diameter of the fuselage, change the location of the air intakes, tail section, cockpit, reduced radar radome.


Design Tu-98


The Tu-98 is a mid-wing with a swept wing (swept along the leading edge - 55 degrees). The power plant included two AL-7F engines, which were placed in the stern of the fuselage. The air intakes were shifted slightly upwards. The main chassis supports were retracted into the fuselage, this caused a lot of trouble during landing on the runway with concrete covering. Crew - 3 man: pilot-commander of the ship, navigator-navigator and navigator-operator. The crew seats were equipped with ejection seats. The front of the plane was occupied by a single hermetic cabin. It was followed by a technical compartment with photographic equipment (AFA-33 / 75). The structure of the fuel system as reservoirs included 4 main and one centering tank, which were located in the fuselage.


Wing caisson dvuhlonzheronnoe.


Armament Tu-98


Conventional aircraft control system, a fixed stabilizer. The designer has made emphasis on the application of irreversible servo control channels.


The front landing gear ended with two wheels, the main pillars had two pairs of wheels.


Tu-98 became the first Soviet bombers equipped with stern Rifle installation DC-18 and two guns AM-23. Aiming weapons facilities carried out by the sight of the radar signals CP-1 «Argon" antenna on which are placed at the top of the keel. The right side of the forward fuselage housed the gun AM-23, firing which could regulate the pilot.


The structure of the rocket and bomb armament of the aircraft could enter the following options:

  • suspension of high-explosive bombs (FAB-500, FAB-250, FAB-100) in various combinations;

  • Suspension rockets - up to 18-212 TRS or TRS-61 132 300 or NAR ARS-85;

  • for the purpose of Naval Aviation - mines AMD and AMD-100-500, torpedoes TAN-53, MAV, MAN PAT-52.


From the sighting equipment Tu-98 was equipped with a red-dot sight OPB-16 and radar "Initiative".

Tupolev Tu-98 characteristics:

Modification   Tu-98
Wingspan, m   17.27
Length m   32.06
Height, m   8.06
Wing area, m2   87.50
Weight, kg  
  maximum take-off   39000
engine's type   2 TRD AL-7F
Thrust, kgf  
  unforced   X 2 6500
  forced   X 2 9500
Maximum speed km / h   1365
Flight distance, km   2440
Practical ceiling, m   12750
Takeoff, m   1160
Mileage, m   865
Crew   3
Armament:  three 23 mm guns AM-23
 Maximum bomb load - 10 bombs FAB-500