Paper model of PT-SAU Su-122

The paper model of the Su-122 PT-SAUis the average Soviet-made self-propelled artillery unit (SAU) of assault weapons class (with some restrictions could be used as a self-propelled howitzer). This machine was one of the first SAU developed in the USSR, adopted in high-volume production. The impetus for creating the SU-122 was both the need to maximally simplify the design of the T-34 tank in difficult for the USSR military conditions of the middle of 1942, and the desire to give the tank and mechanized units a powerful and highly mobile means of fire support. November 30, 1942 at the Ural Heavy Machinery Plant (UZTM, Uralmash), the construction of the prototype SU-122 was completed and, due to the lack of self-propelled artillery, the SU-122 was already launched into serial production in December. In its process, the car was subjected to numerous modifications related to its hasty testing and adoption. The release of the SU-122 was discontinued in August 1943 due to the transition to the production of fighter jets of the SU-85 tanks created on the basis of the SU-122. In total, 638 (including experimental) self-propelled guns were built.

Materials and tools:

  1. scissors, paper knife, drawing ruler
  2. tweezers;
  3. glue brushes and paint;
  4. watercolors (or pencils), toothpicks;
  5. clear acrylic glue ("Moment", etc.);
  6. to print the model matte photo paper with a density of 170-180 g / m2; for small parts - 70-80 g / m2.

Build Tips:

  1. Before you assemble the part, read the drawings and instructions. Determine the place of each part and imagine its assembly;
  2. Make holes in details before cutting out the part;
  3. Cut only the part (s) you need right now. Unpacked items in a box, and unused sheets in a closed folder (as an option). Throwing out trash after work, carefully inspect the scrap paper;
  4. To better fold the part, it is necessary to hold the ruler along the fold line, pressing lightly with the blunt side of the knife or a toothpick so as not to damage the paper surface. Better to do it from the wrong side of the part;
  5. Keep your fingers clean and be sure to use wipes to wipe your hands, because hands may get dirty in the process;
  6. wind up cylindrical parts before gluing onto a round object of a suitable diameter, this will give them shape;
  7. Before gluing it is necessary to paint the ends of the part. White crop lines spoil the overall look of the model. To paint the ends, use watercolors or gouache paints. After selecting the desired color, apply them in a thin layer, then allow the paint to dry. About markers better to forget;
  8. Take your time with gluing. First, cut out the part, paint it from the end, wait for the paint to dry, assemble the part. Attach it to the place where it should be to make sure everything is done correctly. And only then stick. Do not forget to let the glue dry.

A bit of history

Middle Soviet PT-SAU Su-122

Self-propelled installation SU-122 was developed in November 1942 in the design bureau UZTM under the leadership of LI. Gorlitsky. The chief engineer of the machine was N.V. Kurin. The prototype of the plant (factory designation U-35) was manufactured on November 30, 1942. After factory tests, in the first half of December of the same year the self-propelled unit underwent state tests at the Gorokhovets Anolyte Research Institute. On arms was adopted on December 5, 1942 Serial production of the machine began in December 1942.and lasted until August 1943, a total of 638 self-propelled units were manufactured.

The self-propelled unit SU-122 was created on the basis of the medium tank T-34 and belonged to the type of fully armored self-propelled units. The machine was intended for the destruction of fortifications, destruction of firing points and enemy tanks. Armored cabin was in front of the hull. The crew consisted of five people. The landing of the crew was carried out through a rectangular hatch, closed with an armored lid on the hinges, located in the cabin roof. The driver's hatch in the frontal sheet to the left of the gun was intended only for review. A single periscope viewing instrument was installed in the manhole cover. On the roof of the car there was a fixed observation tower, in the sides of which special observation windows were made, closed by armored covers. The tower was set panorama Hertz. In addition, to observe the battlefield, we used mirror viewing instruments installed in the frontal, right, and stern sheets of the armored cabin and the commanding panorama of the PTK on the cabin roof. Removal of powder gases from the fighting compartment was carried out using an exhaust fan.During serial production, an additional fan was installed on the machines of the latest releases.

The main weapon was the 122-mm divisional howitzer M-30 of the 1938 model with a piston gate and a barrel length of 22.7 caliber. The gun was mounted on the cabinet, backed by a transverse beam. The firing range of direct fire was 3,600 m, the greatest - 8,000 m. The rate of fire - 2 shots / min. The ammunition of the howitzer consisted of 40 armor-piercing and high-explosive fragmentation shots with separate sleeve loading. The fragmentation projectile with a mass of 21.76 kg had an initial velocity of 515 m / s. In addition, two 7.62-mm PPSh submachine gun with 1491 ammunition rounds (21 disks) and 20 F-1 hand grenades were placed in the fighting compartment.

Armor armor protection. The hull and deck are welded, made of armor rolled sheets with a thickness of 15.20.40 and 45 mm, with different angles of inclination.

The bottom of the car was made of four armor plates, butt-joint welded seams and reinforced linings. In the bottom, three hatches with armored covers were made: the front manhole (in the combat compartment), the middle engine room (for access to the oil pump and the water pump) and the rear one for draining the oil from the gearbox.In addition, there were five holes with plugs for draining oil and fuel from the tanks, as well as eight rectangular cut-outs, four on each side, for mounting the suspension rollers of the road wheels.

The power plant and transmission were borrowed from the medium tank T-34. In the aft part of the car in the engine compartment was installed four-stroke twelve-cylinder V-shaped diesel V-2-34 with a capacity of 500 hp. (368 kW) The engine was started using the ST-700 starter with a power of 15 hp. (11 kW) or compressed air from two air cylinders. The capacity of the main fuel tanks was 500 liters, the spare - 360 liters. Cruising the car on the highway reached 600 km. In the course of mass production, the external feed reserve fuel tanks of rectangular shape were replaced by cylindrical ones, which were installed on the sides in the aft part of the hull.

The transmission compartment, located behind the engine compartment, housed a manual transmission, which consisted of: the main clutch, a five-speed gearbox, two side clutches and two side gearboxes. As the turning mechanism used side clutches.Mechanical control drives using servo springs. The chassis of the installation differed from the chassis of the T-34 tank reinforced front suspension nodes. The electrical equipment of the machine was made on a single-wire scheme (emergency lighting - two-wire). The on-board network voltage was 24 and 12 V. Four electric 6STE-128 batteries connected in series and in parallel with a total capacity of 256 Ah and a GT-4563-A generator with a 1 kW and RRA-24F relay regulator were used as power sources. voltage 24 V. For external radio communication, the machine installed a radio station 9P, for internal communication - a tank intercom system TTTU-PF.

Using a self-propelled unit to fight tanks was ineffective due to the small initial velocity of the projectile and the low level of its trajectory. The departure of the howitzer barrel was 700 mm, and the anti-recoil devices of the gun that protruded beyond the body of the machine worsened the driving conditions for the self-propelled unit.

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