Tupolev Tu-8
| Industry | Aerospace and defense |
|---|---|
| Founded | 1922 |
| Headquarters | Moscow , Soviet Union |
The Tupolev Tu-8—internally designated as 69 by the design bureau—was a long-range bomber derivative of the Soviet Tupolev Tu-2 medium bomber, which took its maiden flight shortly after the conclusion of World War II. The program was ultimately terminated due to issues including instability, structural weaknesses, and insufficient electrical power to operate its defensive gun turrets effectively. With the emergence of jet-powered bombers, Soviet military authorities opted not to allocate resources toward rectifying the Tu-8’s significant shortcomings.
Development
Following the conclusion of World War II, the Tupolev design bureau resumed efforts on extended-range adaptations of the Tu-2, building upon earlier work such as the wartime but unsuccessful Tu-2D. Known internally as ANT-69, the aircraft was initially intended to be equipped with new Shvetsov M-93 radial engines; however, delays in engine availability led to the substitution with Shvetsov ASh-82M powerplants. Armament plans included 20 millimetres (0.79 in) Berezin B-20 autocannons mounted on existing platforms.
In response to feedback from the Soviet Air Forces (VVS) regarding the original Tu-2 design, the fuselage nose underwent a comprehensive redesign. The navigator was provided with a dedicated seat and benefited from an extensively glazed nose section to enhance visibility. The cockpit layout was altered to position pilots side-by-side instead of tandem seating arrangements, and a seat was added for the ventral gunner. These modifications necessitated enlarging the twin vertical stabilizers to counterbalance the increased forward fuselage area affecting the aircraft’s center of gravity.
The defensive armaments featured electrically powered turrets, including a remotely operated ventral turret controlled by the gunner through prominent rear fuselage blisters. Additionally, the copilot had a swivel seat capable of rotating 180° to operate a B-20 cannon located behind the pilot’s compartment. The Tu-8 incorporated an OPB-4S Norden-type bombsight and offered an increased maximum bombload capacity of 4,500 kilograms (9,900 lb). It was also designed to carry naval mines or torpedoes for deployment by Soviet Naval Aviation.
Official approval for this concept came from the Council of Ministers on 11 March 1947. The prototype was derived from a modified ANT-62T torpedo bomber airframe, retaining its ASh-82FN engines rather than adopting the initially planned ASh-83M units. The first flight occurred on 24 May 1947, followed by extended manufacturer trials lasting until 20 April 1948, during which numerous challenges—particularly with defensive weapon systems—were encountered. State testing commenced on 23 August 1948 and continued until 30 November 1948. The evaluation report from NII VVS (Air Force Scientific Test Institute) was critical:
The aircraft’s performance failed to meet the requirements outlined in the governmental development directive. It exhibited instability across all standard center of gravity positions; both wings and landing gear lacked sufficient strength; its defensive armament effectiveness was compromised due to inadequate generator power for gun mounts; and deicing and lighting systems were insufficient, limiting operational capability in adverse weather conditions.
Tupolev proposed several unsolicited variants such as the Tu-8B equipped with Mikulin AM-42 engines and the Tu-8S powered by Charomski ACh-30BF diesel engines; however, none received approval. With jet bombers like the Tupolev '73' already in flight tests and demonstrating superior potential compared to piston-engine designs, Soviet military planners chose to prioritize jet-powered bomber development over further investment in piston-driven models like the Tu-8.
Variants
- Tu-8
- The original model equipped with radial piston engines.
- Tu-8B
- A variant featuring Mikulin AM-42 inline piston engines.
- Tu-8S
- This version utilized Charomskiy ACh-30BF diesel powerplants.
- '72'
- A jet-powered adaptation driven by Rolls-Royce Nene I turbojet engines, officially designated as Tu-18 2 x Nene I.
Specifications
References
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