IL-6 was developed under the leadership of SV Ilyushin and is an experienced bomber torpedo. He had to be replaced IL-4, Which was used in naval aviation. His appearance it strongly resembles an increased IL-4.
History of the IL-6
SV Ilyushin, given the experience of combat use of IL-4, proposed to create a long-range bomber with exactly the same as its predecessor, the size of the bomb load and flight range, but with a significantly higher (almost 100 meters per hour) cruising speed during the flight to the maximum range, with better armor protection jobs crew onboard advanced defensive weapons. It was possible to increase the combat effectiveness of the bomber and through the introduction of co-pilot in the crew, equipment, machines icing systems used for heating the heat exhaust radial engine two leading edges of the wing. Takeoff power - 2 thousand. hp (1470 kW). Use this plan and bomber aircraft in the Navy, and the role of low- and high-altitude torpedo torpedo with external suspension of two torpedoes.
Air Force Ilyushin approved the project created a new long-range bomber and torpedo bomber, the designation Il-6. But in the process of designing them came the desire to replace gasoline engines and increase range.
The feasibility of the installation of diesel engines to IL-6 is primarily determined by their good economy: their fuel consumption by almost 40% less than petrol is the same power. Moreover, the diesel engine is not prone to detonation, could be used instead of high-octane gasoline cheaper kerosene, which is due to less volatility provided for fires and explosions in combat. Also high density of kerosene can reduce the size of the tank, thereby reducing the weight of the aircraft structure. Because of the high compression of fuel cylinders and a large temperature characteristic of the thermodynamic cycle of the engine, it is characterized by greater than a gasoline engine power.
But whatever it was, design calculations have shown that the high saving diesel engine makes it profitable to install, especially if you consider the fact that the flight range increased by more than five hours. Bombers IL-6, carried out a raid on Berlin, with a diesel engine, it might cause twice as much damage as compared to gasoline.
Experience in a limited operation EF-2, equipped with diesel engines, revealed their shortcomings (in the field difficult start). Along with the design of the IL-6 engineers improved the engine, trying to make it a more powerful version.
At the heart of the IL-6 scheme used with a simple twin-engine nizkoplan odnokilevym vertical tail surfaces. Its main dimensions such as the length of the fuselage and the wing area, were almost identical to the size of the aircraft DB-4. But the aerodynamic wing element and such relative performance of the wing as narrowing and elongation were on this other machine.
The designers sought to ensure high safety, which is dependent on the development of the stall, passes through the upper surface of the wing. And they found the optimal choice of the wing, which had a constant throughout the scale aerodynamic profile, characterized by a positive sweep of the leading edge and a large contraction.
Return to single-fin system on the aircraft is entirely based on the experience of flight testing and design of DB-4, which demonstrated that the benefits of diversity vertical stabilizer more scarce compared to its disadvantages. Recent were mainly associated with the difficulty of providing a desired directional stability of the machine on different flight conditions, especially in case of breakage of one of the engines.
The crew consisted of 6 persons: two pilots are in the cockpit of a single close to each other, the navigator, who was sitting in the bow cabin, based on DB-used cabin 3F, two gunners and radio operator-gunner. Their jobs were located in the upper part of the fuselage. It is worth noting that the entire crew had a reliable armor protection, the weight of which is 400 kg.
Protect the aircraft from enemy aircraft was quite powerful and carried out with the help of 5 mobile gun systems: the turret top, bottom, bow, two side mounted on the left and right sides of the fuselage. All units are equipped with a defensive gun, 20 mm. Moreover, total stock units had 850 shells.
Creation of the first aircraft was carried out under the engine ACh-30B, whose power was clearly insufficient for the design weight of the aircraft. IL-6 in this regard was submitted to the flight test without side cannon systems, and the crew was reduced to 5 people.
In August, 1943 years built the first airplane with an engine ACh-30B running VK Kokkinaki (test pilot). We can not say that the trial runs smoothly. Diesel engine was unreliable and have been some difficulties in piloting the machine, especially during landing. Engineers could not manage to identify the cause of this. As a result of IL-6 was transferred to the Flight Research Institute, where further tests were carried out fliers NS Fish and AN Grinchik.
In IL-6 1944 summer, the high-revving engine models installed ACh-40BF that, in addition to the nominal regime were still military, which managed to develop the capacity of the motor 1500 hp (1130 kW) at an altitude of 6 thousand. м. At the military and takeoff to improve the reliability of the engine ACh-30BF conducted a two-phase process of mixing. Installing such an engine will perform additional equipment on-board air Machine gun mount, improved armor protection of the crew, which was in the middle of the cabin. Following the flight research controllability and stability of the area of the elevator has been reduced over the back of the plane was the alignment, and reduce the size of the elevator.
IL-6 became the last team OKB built bomber that has a piston engine. Then he created several piston bombers had good performance characteristics, which had many original features.
|Wing area, m2||84.80|
|engine's type||2 DD ACh-30F|
|Power, hp||X 2 1900|
|Maximum speed km / h|
|near the ground||400|
|Practical range, km||5450|
|Rate of climb, m / min||174|
|Practical ceiling, m||7000|
|Armament:||Three 7.62-mm machine gun ShKAS|
|bomb load -up 4500 2 kg or torpedoes|
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