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Br-5 – Mortar high power 280 mm sample 1939 of the year


		Br-5 - Mortar high power 280 mm sample 1939 of the year

Because, that in the late 30s, the Red Army was preparing to conduct a "defensive" war "on foreign soil a little blood", there was a need for artillery guns, capable of destroying the powerful fortifications on the borders and inside the territory of neighboring states. Such tool - 280 mm mortar Br-5 - developed design office "fence" plant in accordance with the tactical and technical requirements GAU RKKA.

Mortir 280 mm-Br-5 – video

Factory testing of the prototype mortars were carried out in December 1936 of the year. In April 1937 year modified for the factory test results of the prototype was taken to Research artillery range (NİAP) for ground tests. We carried out the landfill of mortars 104 shot in November of the same year made their verdict: "Br-5 field tests could not stand and can not be admitted to military trials without correcting the defects and re-ground tests".
Plant "Barricades", meanwhile, has been issued an order for a series of 8 mortars of this system. Due to the result of ground tests the order was reduced to 2 guns, which essentially had to be modified by the results of tests prototypes.


		Br-5 - Mortar high power 280 mm sample 1939 of the year

At the beginning 1939 g. 2 experienced mortar Br-5 once again brought to the NIAP and although some shortcomings were identified during the test, mortar in the same year have adopted and put into mass production. Mortar was designed by blending newly-designed 280-mm barrel on carriage 203 mm howitzer B-4, thus become common to 3 major Soviet artillery guns and a large specific power.
Mortar had a barrel length of bonded 17 calibres. It consisted of a tube, the casing and the breech. In the barrel was performed 88 rifling constant slope. rifled part of the barrel length was 14 calibres. The barrel is locked by means of two-stroke reciprocating shutter. Mass barrel with the shutter was 5950 kg. Barrel with a cradle and recoil device installed on the top machine gun carriage howitzer B-4. The lifting mechanism is allowed to direct mortar gun carriage in a vertical plane in the range of angles from 0 ° to + 60 °, but the firing was possible only at angles vertical lay more than + 15 °. Guidance in a horizontal plane as possible in the sector of ± 4 °.


		Br-5 - Mortar high power 280 mm sample 1939 of the year

For firing of mortar Br-5 were used and concrete-explosive shells of Soviet manufacture. as well as the French high-explosive shells, preserved in warehouses GAC since the First World War era. Firing tables provided for the use of 11 variable charges by weight 9,88 to 3,45 kg of powder. When firing the full charge explosive projectile F-674K had initial velocity 420 m / s. a firing range was 10 950 m.
Shells and charges were submitted to the gun on the truck, and their rise to the breech was made using a hand-operated crane. Rate mortar was 1 shot at 11 minutes. If the calculation did not go into hiding, the fire can be the tempo 1 shot at 8 minutes. mortar mass in the firing position was 18 400 kg.


		Br-5 - Mortar high power 280 mm sample 1939 of the year

Transportation of mortar was carried out as two carts - on the sledge-flitches from limber weight 13 800 kg receiver and carriage mass 11 300 kg. For towing carts used trucks such as "Stalinets-2" and "Voroshilovets". Permissible speed traffic on the highway was 8-15 km / h. A short distance mortar can be transported in the form of undismantled. As for the BR-2 systems, and B-4 time translation tools from traveling to combat, including passage trench for the opener and the breech, depending on the soil and the season is from 45 minutes before 2 hours.
Baptism of fire mortar Br-5 took place during the Soviet-Finnish War. Of 4 mortars fired 414 shots, no mortar was not lost. By the beginning of World War II 280-mm mortar Br-5 consisted armed with eight separate artillery battalions, a special power RGC. Each division consisted of three two-gun battery. Divisions were used in the fighting in the final stage of the war. Judging on a reported basis, no mortar was not lost.


		Br-5 - Mortar high power 280 mm sample 1939 of the year

Performance characteristics of mortar Br-5

Caliber, mm………………………………………………………………..279,4
barrel length, calibres………………………………………………..17
The highest elevation angle, city……………………………….60
angle of declination, city…………………………………………………..„…0
Horizontal angle of fire, city ………………………………….8
Weight in firing position, kg…………………………………..18 400
The mass in the stowed position, kg……………………………..19 700
explosive projectile Weight, kg……………………………………….286,7
The initial velocity of the projectile, m / s ……………………………………420
Most firing range, m …………………………..10 950

Photo mortirы Br-5


		Br-5 - Mortar high power 280 mm sample 1939 of the year

Calculation mortar Br-5 preparing to open fire


		Br-5 - Mortar high power 280 mm sample 1939 of the year

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