The 57mm Ch-26 anti-tank gun was designed under the leadership of Charnko in OKBL-46 in 46-47.
The barrel is a monoblock with a screwed breech. The muzzle brake of high power on a length of 1150 millimeters had 34 windows. The brake, which is screwed onto the barrel, is a continuation of its rifled part. The vertical wedge gate is mechanically semiautomatic.
When creating the gun carriage, the German 75/55 mm anti-tank gun RAK.41 was taken as a sample. The bearing shield played the role of the lower gun carriage, on which all the gun assemblies were mounted. The upper lathe is a hemispherical mass reinforced in the middle of the shield. The role of recoil devices was played by a spring recoil and a hydraulic recoil brake. Rotary and lifting screw mechanisms. Sliding frame, box section, welded, attached to the shield.
The shielded bearing shield consisted of a pair of 3 and 4 mm sheets.
The suspension had coil springs. Several lightweight standard wheels from GAZ-A, GK tires.
For direct fire, the OP1-2 sight is used.
The prototype Ch-26 in July - September 1947 passed field tests together with the 57-mm M16-2 cannon at the main artillery range. Based on the test results, the commission gave preference to the Ch-26 cannon and recommended it after the elimination of design flaws for military tests.
Plant No. 235 in August 1948 handed over 5 Ch-26s for military trials, two swinging parts and one cannon for OKBL-46. These guns were made according to the drawings corrected after field tests. The mass of the gun increased to 825 kg.
Plant No. 235 in April 1950 produced 20 Ch-26 cannons intended for military trials. These guns were sent to the Belomorsky, Belorussky, Turkestan, Trans-Baikal and Transcaucasian military districts, and two guns from the first series were sent to the airborne army. In all VOs, military trials were carried out from May 25 to September 1, 1950, except for the Trans-Baikal where they ended on February 1, 51. During military tests, the shortcomings of the barrel were revealed, as well as the fragility of the M-20 wheels. The commission considered that the Ch-26 cannon withstood military tests and was recommended for adoption.
Plant No. 106 in 1951 made a series of 100 Ch-26 anti-tank guns.
Technical data of the prototype of the 57 mm Ch-26 anti-tank gun:
Caliber - 57 mm;
Barrel length including muzzle brake - 4584 mm / 80, 4 clb;
The length of the threaded part - 3244 mm;
The number of grooves - 24;
Depth of grooves - 0.9 mm;
Rifling width - 4, 65 mm;
Width of fields - 2, 8 mm;
Angle of vertical guidance - from -8 ° to + 18 °;
Horizontal guidance angle - 57 °;
The height of the line of fire - 733 mm;
Length in the stowed position - 6620 mm;
Width in the stowed position - 1775 mm;
Height in the stowed position - 1145 mm;
Stroke width - 1520 mm;
System weight in combat position - 799 kg;
Rate of fire - 25-30 rounds per minute;
Transportation speed on the highway is 50-60 km / h.
