In the fall of 1944, simultaneously with the work on the bomber aircraft "64" in the design bureau of A. Tupolev, the passenger version was worked out - the plane "66" . The transition from a bomber version to a passenger version required the following modifications to the design of the original aircraft: a central fuselage compartment 2 m long was replaced at the wing center wing section; the center wing fell 0.5 m down, the plane became low-level; inside the fuselage above the wing was created a free passage and a place for two toilet rooms; The unsealed bomb compartments were sealed, creating a common hermetic cabin from the fuselage toe to the rear hermetic compartment of the rifle cabin. The need for such alterations was provided for in the design of the combat version, which enabled simultaneous serial production of both variants or rapid conversion of one into another.
The "66" had two passenger cabins in the front compartment between the cockpit and the wing and three passenger cabins in the rear compartment. Each cabin was designed for eight passengers. Behind the cabins was a salon for another 12 passengers. The first four cabins could be converted into sleeping cabins, four in each. The total number of seats was 52 (50) in the daytime version, 36 (34) in the night version, 16 of them sleeping. The luggage compartments were located between the crew cabin and the passenger cabins opposite the front entrance and the HCP.
There was a buffet between the cabins and the salon opposite the rear entrance. The crew of the plane consisted of six people: the first pilot - the commander of the ship, the second pilot, the navigator, the flight engineer, the radio operator and the stewardess. The entire crew, except for the stewardess, was located in the front cabin. Materials on "66" in the form of a draft design were presented to the customer - the Main Directorate of the GVF. In turn, the customer prepared technical requirements for the construction of a prototype of a four-engine passenger aircraft intended for the transport of passengers, baggage and mail on all domestic and international long-haul lines.
At some re-equipment the plane was supposed to be used for cargo transportation. Under wartime conditions, the aircraft was to be used in military transport, landing and sanitary variants and have a device for towing cargo gliders. luggage and mail on all domestic and international long lines.
The engines would have a power of at least 1500-2000 hp, the cruising speed should be at least 400 km / h, the flight range with a normal flight mass of 2500 km, with the overload weight of the aircraft - 5000 km, the commercial load should have been make up at least 6 tons, the number of passenger seats - 50. The crew was to consist of 7 people (two pilots, flight mechanic, navigator, radio operator and two stewardesses).
When using an airplane in a military transport variant, it was envisaged to transport concentrated cargo with a specific pressure of 650 kg / m2, a military unit with armament, suspended parachute cargoes of 200 kg in the amount of 16-18 hangers, suspended non-oversized oversized cargoes weighing 200 kg with fastening on knots parachute cargo, as well as light tanks, aircraft planes, etc. To facilitate the loading, removable boom-cranes should be provided. In the power scheme of the construction of the fuselage, a loading door with dimensions of 2.4 x 2 m was provided, as well as places of cargo fastening units in the floor and along the sides.
When using the airplane in the parachute variant, transportation of 60 paratroopers in winter uniforms, with combat equipment (the weight of a fighter about 100 kg) was envisaged. The fuselage of the aircraft had two doors opening inwards with dimensions of 0.75 x 1.5 m. The doors were located in different parts of the fuselage, so that the landing party could leave the aircraft in the shortest possible time.
When using the airplane in the sanitary version, 50 wounded were transported in a lying position, accompanied by two medical workers. The design of the fuselage had to have nodes for fastening standard troopers and cylinders with medical oxygen. For this option, a heating and ventilation system was provided, taken from the passenger version of the aircraft.
When using an airplane in military variants, it provided for the installation of three defensive shooting points: for the firing of the upper hemisphere, a turret mechanized turret for two twin cannon with a caliber of 20 mm with a ammunition capacity of 300 cartridges per barrel; for firing at the rear hemisphere - a mechanized turret for two twin cannon with a caliber of 20 mm with ammunition of 400 cartridges per barrel; for firing the front hemisphere - a mechanized mobile rifle unit for two machine guns caliber 12.7 mm with ammunition of 200 cartridges per barrel.
The crew of the aircraft in military versions consisted of 7 people (two pilots, navigator, flight mechanic, radio operator and two riflemen). Provided armored protection crew.
Work on the aircraft "66" and its variants did not leave the stage of preliminary design and coordination with the customer TTT. However, the experience gained in the design bureau was later used in the design and construction of the Tu-70 passenger aircraft, the Tu-75 military transport aircraft, transport and airborne modifications of the Tu-4 airplane, as well as in the design of transport-sanitary versions of serial passenger postwar aircraft.
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