Saturday, 21 February 2015

Preferred Seating

Sure, you can fit a lot of riders on a tank, but surely some of those soldiers ride more comfortably than others? VIF2NE poster Ryadovoy-K shares his experience on the subject. The advice is specific to the BMP-2, but the theory can be applied to any vehicle.




"We had to ride the "two" often and many times, and most importantly, for long stretches of time. All soldiers knew what places are good and what places are bad. Riding in a bad place for half a day delivers no pleasure, only problems.

The best spot is marked in red, but only if the infantry commander's hatch is open. However the driver could forbid this. Old vehicles could have a bad rubber seal, and once you open that hatch, it will leak during rain. Drivers slept on their seat and the seat of the infantry commander, and nobody wants to get wet. Further down the list: orange and yellow. Riding atop the front of the turret is good. You can sit well and see well. Light green is good when the BMP is fully functional and the wind is not coming from the front or the right. A BMP that's acting up could spew oil from the exhaust collector, and when the wind is blowing, you end up breathing in the exhaust.

Red with a stripe is worse than riding on the front of the turret, but it will do. If nobody is sitting on orange, you can lean on the turret, and it's easy to hold onto the gun when the vehicle lurches. Others say that they would place a seat from a car here, and it would become the best spot.

Blue: sitting behind the turret is inconvenient, as you're sitting against the direction of motion, and during the summer dust gathers there like with a vacuum cleaner and causes you problems. Yellow with a stripe: you can lean on the turret and hold onto the gun, but the proximity of the exhaust times the direction of air makes a significant drawback.

Black with a stripe and blue with a stripe. People sat here when the BMP carried one to two squads at the same time. It's uncomfortable (there is nothing to lean on with your back) and you feel the vehicle lurching more strongly.

Black, purple, gray, white: we tried not to sit here at all. In the first two, sitting against the direction of motion is uncomfortable, and during the summer you will choke on dust. The gray and white spots can only be occupied when the rear hatches were open, but this is not allowed, as dust will collect inside the vehicle. On old vehicles, this also causes leaks (the rider compartment was also used for sleeping, and nobody needed water pouring in).

The worst option is green with a stripe. Sitting right next to the exhaust causes a torturous pain in your eyes and difficulty breathing.

The gunner sits in the green spot and the commander sits on the light blue spot."


Thursday, 19 February 2015

SU-76, Grabin Style

The factory #37 design was far from the only attempt to mount a 76 mm gun on a light tank chassis. Grabin, the man who invented the ZiS-3 in the first place, has his own idea about how to make it mobile.


"Attachment to the IS-10 SPG sketch

This is an attachment to the sketch of an IS-10 SPG, which consists of a 76.2 mm ZiS-3 divisional gun on a T-70 tank. The use of a ZiS-3 in a T-70 tank achieves a powerful self propelled gun with minimal changes to the gun or tank. In the event that higher penetration is needed, the barrel can be replaced with one from a 57 mm AT gun."

Wednesday, 18 February 2015

Valentine and Matilda Delivery Quality

"To the Deputy Chair of the Council of People's Commissars of the USSR, comrade A.I. Mikoyan

A series of defects was discovered at Gorkiy and during subsequent use in the army in MkII (Matilda heavy tank) and MkIII (Valentine medium tank) tanks that arrived from England.
  1. Out of 137 tanks that arrived at Gorkiy, 58 broke down due to frozen water in the engines. Additionally, 20 tank batteries (4 batteries per tank) broke due to freezing of the electrolyte, due to its reduced density.
    We must use imported parts to repair all 58 vehicles, but there are not enough engines and batteries, and we require additional supplies to repair 30 tanks. English representatives confirmed that a portion of the tanks arrived at Arkhangelsk with water in the engine cooling system.
  2. The MkII tank has a compressor for controls and the gearbox that works poorly in winter temperatures. It is necessary to ensure that the compressor works flawlessly in our winter on subsequent shipments.
  3. Many cases of track pin breakages were observed in battle conditions on both tank types, as well as breakages of idler ball bearings on MkIII tanks when moving across rough terrain.
  4. The track faces of both types of tanks are smooth, and the tanks slide around. It is necessary to weld grousers to these tracks.
  5. On MkII tanks, the front sloped (left and right) plates are torn out of the tank when towed. It is necessary to reinforce them.
  6. The MkIII tank has many small defects, such as:
    1. The water drainage valve does not allow for all water to be drained from the engine cooling system. It must be placed in the lowest point of the water pipes.
    2. The vertical position of the compensator coil of the water drainage pipe means that all water cannot be removed from it.
    3. The radiators overcool in winter conditions. It is necessary to install warming shutters.
    4. Rubber tires on the road wheels often slide off. It is necessary to attach them in a more reliable way.
Tanks are not evenly supplied with instruments. Some have more, some have less. It is necessary to equip them according to established norms.

I ask you to report the above to English representatives that supply us with tanks so that the aforementioned defects can be resolved.

GABTU Chief, Lieutenant-General of the Tank Forces, Fedorenko
GABTU Military Commissar, Army Commissar 2nd Grade, Biryukov"

Tuesday, 17 February 2015

T-29 Torsion Bars

The T-29 is a fairly well known successor to the T-28, largely being the same tank but on a Christie suspension. It is also fairly well known that T-28 has a prototype with torsion bars. However, here's a rare combination of the two, a T-29 with torsion bars (Object 115).


"Torsion bar suspension (designed by personal initiative)
  1. Design of the "torzion" bar suspension on the T-29 tank.
  2. A proof of concept of the "torzion" bar suspension (1937-1938)"
And yes, it is written "torzion" in the original, including quotation marks.

Monday, 16 February 2015

Valentine MkIX Trials

The Red Army has been a fan of the Valentine tank for many years, so when a new modification with a 57 mm gun that solved both the problem of an ineffective AP shell, one was naturally ordered for trials.

Valentine MkIX tank at Kubinka, March 1943

Valentine MkIX observation range (driver).

Valentine MkIX observation range (turret).

"Firing in place and on the move

Gunnery trials were performed at ranges of 500 and 1000 yards (457 and 914 meters) at targets 4x6 meters in size. Each group had 10 shots. There was no time limit on firing. Aiming was done using the telescopic sight. The weather was clear, visibility was 2000-2500 meters.

Results are given in table #4.



Range (yards) # of shots # of hits Mean vertical deviation, cm Mean horizontal deviation, cm
In place 500 10 10 11 8
In place 1000 10 10 18 16
Moving at 10 kph 400-500 10 10 95 75

Comparing the data in table #4, one can see that:
  1. Mean vertical deviation is higher than mean horizontal deviation in all cases. This is explained by a wobble in the elevation mechanism and a turning of the flywheel when the firing lever placed on the flywheel is pulled.
  2. Mean deviation when firing from the move is 11 times greater than when shooting from a standstill from the same distance. This happens due to the stiffness of the suspension and the insufficient traction of the tracks on the ground, which leads to the tank slipping and the turret wobbling, which makes it difficult to aim the gun.
Maximum rate of fire in place and on the move

The maximum aimed rate of fire was measured at a range of 700-1000 yards (640-914 meters). Aiming was performed using the telescopic sight using the mechanical aiming mechanisms. Each group consisted of 5 shots. The weather was clear, visibility was 2000-2500 meters.
Results of trials and hits on target are given in table #5.

Condition # shots


Result Time


RPM % hit
Hit Close miss Overshot Undershot Deviation in direction
In place. Range= 1000 yards 5 3 2 - - - 30 sec 10 60%
Moving at 9-10 kph, at 0 degrees, at one target 5 2 2 - 1 - 1 min. 51 sec. 2.7 40%
Ditto, at two targets 5 1 1 1 2 - 1 min. 47 sec. 2.8 20%
Ditto, at three targets 5 - - 2 3 - 2 min. 4 sec. 2.5 0%
Average













2.7 20%
Moving at 15 kph, at 0 degrees, at one target 5 - - 3 2 - 2 min. 24 sec. 2.0 0%

Summary
  1. The English Valentine IX tank differs little from the Valentine III tank. The main difference is the use of a 6-pdr gun in the Valentine IX, a lack of coaxial machinegun, and thinner side armour.
  2. The speed and maneuverability of the two tanks are nearly identical, with the exception of range, which increased in the Valentine IX by 90% due to external gas tanks.
  3. The 57 mm gun on the Valentine IX has an unreliable recoil brake.
  4. Unsatisfactory results when firing from the move, 20% hits, are achieved due to significant wobble in the aiming mechanisms.
  5. A lack of HE grenade for the 57 mm gun limits the usefulness of the gun.
  6. A lack of coaxial machinegun limits the usefulness of the tank when fighting enemy infantry.
Conclusions
  1. Valentine IX and Valentine III tanks are equivalent technically.
  2. The armament of the tank makes it only useful against enemy tanks.
  3. The lack of an HE grenade and a coaxial machinegun makes the tank unable to fight enemy infantry and fortifications.
  4. The reliability of the 57 mm gun needs to be tested on a series of samples."
CAMD RF 38-11355-1540

Sunday, 15 February 2015

Replaceable Tires

"USSR NKTP
All-Union State Special Machine-building Trust
April 4th, 1935
#37-372-1232s
To the director of the Voroshilov factory, comrade Dufur
Copy: director of the Kirov factory, director of factory #185, RKKA ABTU

Despite the quite obvious necessity of switching to T-26 tanks with removable road wheel tires in 1935, the issue is still not resolved. The necessity of using removable tires is confirmed by both trials (in a 3000 km run, only two road wheels broke for reasons not connected to their tires) and the unsatisfactory robustness of the enlarged road wheels on that same vehicle, SU-5, and other vehicles on the T-26 chassis.

The claim that the production will be too costly is countered by the necessity to restore the old casting molds, which will be more expensive than making new casting molds for the simpler removable tires.

Finally, the cost of use will not increase if one considers the significant gain in reliability and decrease in rejections of manufactured components. The tire will be molded on a separate simple mold, as opposed to a complicated combination mold.

Considering the aforementioned points, I consider it necessary to immediately switch to removable tires for the T-26, for which:
  1. The director of the Voroshilov factory, comrade Dufur, in cooperation with the Kirov factory, must develop a plan to produce production together with the aim of switching to production of removable tires in the fourth quarter of 1935.
  2. The directory of factory #185 comrade Barykov must sign a contract with the Kirov factory to supply road wheels for the production of the SU-5 and other experimental vehicles on the T-26 chassis.
The full plan of shifting production to road wheels with removable tires and the cost of this transition should be given to me for approval no later than April 15th of 1935.
Director of the Special Machine-building Trust, Neimann"

Saturday, 14 February 2015

Valentines for Victory

The plucky little Valentine tank was in the very first catalog of tanks offered to the Soviet Union by the British. The first Valentines went into battle in November of 1941, and despite orders ceasing due to the Valentine's obsolescence, Valentine tanks remained in the Red Army until the end of the war, not just fancy Mark XIs but regular old MkIII*s as well.

"To the commander of the 6th Guards Cavalry Grodno Division
Battle report #0113, HQ of the 198th Allenstein Tank Regiment, Rheinsberg, 10:30, April 30th, 1945. Map 100.000, dated 1935
  1. The regiment, in cooperation with the 28th Cavalry Regiment, travelled 40 km with battles on April 29th, 1945, capturing the following settlements: Barsdorf, Blumenow, Zootzen, Tramzov, Buchholz, Burow, Menz, Rheinsberg.
  2. The following damage was done to the enemy:
    1. Destroyed:
      1. 11 large caliber guns
      2. 19 automatic guns
      3. 1 SPG
      4. 14 AA machineguns
      5. 20 hand machineguns
      6. 8 mortars
      7. 9 APCs
      8. 7 tractors
      9. 123 cars
      10. 23 motorcycles
      11. 100 bicycles
      12. 80 trailers
      13. 134 soldiers and officers killed
    2. 60 enemy soldiers and officers were taken prisoner
    3. 725 Soviet prisoners of war were liberated
  3. No materiel or personnel losses were taken on April 29th, 1945
  4. The regiment has:
    1. 5 T-34 tanks, 5 combat ready
    2. 10 Valentine MkIX tanks, 8 combat ready
    3. 3 Valentine MkIII tanks, 3 combat ready
    4. 7 SU-100, 7 combat ready
    5. 5 S-76, 5 combat ready
      Two MkIX tanks need medium repairs, and one SU-100 needs light repairs.
  5. Supplies:
    1. Fuel and lubricant
      1. Gasoline: 0.5 refills
      2. Gasoil: 1.3 refills
      3. Aircraft lubricant: 1.3 refills
    2. Ammunition:
      1. 100 mm shells: 2 refills
      2. 85 mm shells: 2 refills
      3. 57 mm shells: 1.3 refills
      4. 40 mm shells: 0.5 refills
      5. BESA ammunition: 1.8 refills
      6. Bren ammunition: 1.8 refills
      7. DT ammunition: 1.8 refills
    3. Food: 3 days
  6. Communication with HQ is done through a communications officer."

Friday, 13 February 2015

World of Tanks History Section: How Tanks Learned to Fight

European strategists planned on finishing up the war that erupted in August of 1914 in only a few weeks. Many young officers were afraid that they would not have time to prove their bravery on the battlefield. Sadly, both groups were mistaken. Not that much time elapsed before the war ended up in a positional dead end. All offensives ended up the same: hundreds, sometimes tens of meters of progress at a horrible cost in human lives.

Both sides of the conflict looked for a solution, inventing more and more new types of weapons until one September morning in 1916, the sound of tracks and tank engines filled the air.

Perfect Theory and Flawed Practice

The British military theorist Ernest Swinton and French Jean-Baptiste Etienne proved the need for tanks on the battlefield and described in detail how they should be used. They wrote that tanks should be used suddenly, in large numbers, and only on appropriate terrain. Here, Swinton immediately made the note that there is often a gap between theory and practice.

That was exactly what happened in first tank battles. The army, exhausted by battles at the Somme, needed hope for a victory. Not in a year or two, but now. There was no time to save up tanks, train crews, and practise cooperation with infantry. Any delay could mean loss of initiative to the Germans. This is why instead of armoured armadas, only 32 tanks went into battle on September 15th, 1916. Five got stuck in mud or craters, and nine had their engines break down, but the rest reached their battlefield.

Of course, the first tank attack shocked the Germans. However, the miserly amount of tanks failed to influence the entire front, and the Germans quickly regained their courage and no longer fled from the "devils" that appeared on the battlefield. They fought against tanks, and with some success. Grandiose claims of overwhelming success in Entente press had little in common with the truth.

Swinton's cautions were confirmed in the first battle, and the situation repeated itself with some regularity. Tanks attacked through a pock-marked landscape, got stuck in it without the aid of engineers, and were destroyed by enemy fire. Infantry followed tanks clumsily, German machineguns mowed down anyone who was visible between the tanks, and many soldiers died from fragments of shells that exploded on the tanks' armour. Tanks without infantry were easy prey for the enemy. Tanks were supposed to be a wonder weapon, but resulted in little more than disappointment and criticism.

Infantry's Low Priority Escort

Despite all that, tanks were seen as a useful invention. By the end of the war in 1918, armoured forces began to take shape. Due to technical limitations, their vehicles could not perform any tasks independently. Tanks worked tightly with infantry, and there were rigid rules about how it was done.

A tank attack was to start at dawn, so drivers could see. Excess noise was to be avoided. Tanks travelled in groups of three: while the front tank suppressed the enemy, the other two cut a path through the wire for infantry. Each tank had no more than a platoon of infantry (25-30 men) accompanying it. Tanks made very narrow openings in barbed wire, so too many soldiers would create a crowd that was vulnerable to enemy fire.

Infantry split up into three groups. The first group destroyed the enemies in trenches with the aid of tanks. The third group marked openings on the wire and guarded them from enemy counterattacks. The last group assisted the first two and other attacking infantry.

The most important thing for infantry was to not lose contact with tanks. Armoured vehicles could cover it, force the enemy to withdraw, or just distract advancing enemies. When attacking a village or a forest, some tanks would attempt to get into the enemy flank or rear. Maneuvers were concealed with a smoke screen. Some tanks were left behind to protect flanks.

If there was a delay, the tanks were supposed to take cover. After that, tank commanders and gunners were to leave the tank, meet up with infantry commanders, and discuss further action.

Definitive Success: Battle of Hamel

A classic example of a competent tank attack was the battle at Hamel on July 4th, 1918. Before its start, cooperation between tanks and infantry was drilled thoroughly. In order to "befriend" the soldiers and these fairly esoteric vehicles, a proper name was painted on each one. This simplified communications and improved morale. During training, tanks crossed real trenches and barbed wire. Soldiers not only rode on and in tanks, but were given a chance to drive them.

The Entente carefully examined enemy positions. Aircraft were constantly flying over the front lines. In the morning, the artillery and machineguns started firing suddenly. The Germans didn't know if it would be an offensive or just another day of a positional war.

When the real attack started, the noise of tank engines were drowned out by aircraft. This trick was used several times, such as when attacking Amiens in August of 1918 or by the Red Army during Operation Bagration in 1944.

60 new MkV tanks participated in the offensive. Vehicles followed the creeping artillery barrage closely. Every 3-4 minutes, the barrage shifted forward by 100 meters. Tanks proved very helpful when fighting machinegunners. As a result, the Entente captured about 1500 prisoners and many weapons, including brand new anti-tank rifles.

Support in battle was also carefully practised. Each tank carried two crates of ammunition, magazines for Lewis guns, and drinking water. They were in turn supported by tanks converted to armoured carriers. Four of these vehicles delivered over 20 tons of supplies only half an hour after enemy positions were captured: ammunition, grenades, water, barbed wire, and stakes. For the first time in history, aircraft didn't just perform reconnaissance from the air, but dropped supplies for infantry with parachutes.

The commander of the operation, Australian General John Monash, later wrote: "everything was decided within 93 minutes".

And so, within two years, tanks made their journey from questionable novelties to a fully fledged type of forces. Here, the evolution of offensive tank tactics stopped. Europe was tired of war. Although there were many conflicts between 1918 and 1939, they were mostly local. Experience gained from them was limited and specialized. When a new large war started, tank tactics had to be learned anew from almost nothing.

Original article available here.

Author: Evgeniy Belash

Evgeniy Belash is a historian, an author of books and articles on the First and Second World Wars. His best known work is "Myths of the First World War". He is the author of a book "Tanks of the Interbellum" on the participation of armoured vehicles in military conflicts in the 1920s and 1930s.

Sources:
  • Fletcher David. Tanks and Trenches: first hand accounts of tank warfare in the First World War. History Press, 2009. P. 116–120.
  • Infantry and tank co-operation and training. War department, 1918.
  • List, Single, Major. The battle of Booby's Bluffs. United States Infantry Association, 1922.
  • Monash, John. The Australian victories in France in 1918. London Hutchinson, 1920. P. 48–60.
  • Mitchell F. Tanks at War. History of development of tanks in the 1914-1918 World War. Moscow. Gosvoyenizdat, 1935

Thursday, 12 February 2015

Rebarrelling

German tanks weren't the only things to be converted to be compatible with Soviet supplies. A plan to use German artillery was in place as well.

"To: TsAKB Chief, Lieutenant-General of Technical Forces, comrade V.G. Grabin
Copy: Artkom chair, Lieutenant-General of Artillery, comrade V.I. Hohlov

On the issue of converting captured guns

I reply to letter #109s sent on November 16th, 1943, to report that your proposed ideas and analysis of conversion of German heavy artillery deserves the attention of NKV and GAU KA. According to this analysis, I propose the following conversion projects:
  1. 211 mm mod. 1918 heavy mortar to the ballistics of a 203 mm B-4 howitzer.
  2. 150 mm mod. 1918 and mod. 1939 guns to the ballistics of a 152 mm Br-2 gun.
  3. 150 mm mod. 1918 howitzers to the reduced ballistics (first charge) of the 152 mm ML-20 gun-howitzer and 122 mm A-19.
Report on acceptable timeframes for TsAKB as soon as you receive this message.

Chair of the NKV Technical Council, Satel."

Wednesday, 11 February 2015

Swedish Intel

Today's article is brought to you by Something Awful forums poster TheFluff who works with Swedish archive documents. He dug up a rather interesting instruction to the Swedish army attache in Moscow, which reveals that the Swedes had a rather high opinion of Soviet armour:


"Armored fighting vehicle development in the Soviet Union

Briefing for the army attache in Moscow, 1962-09-03, 13:00-13:50.

(Handwritten: head of the vehicle department, head of the intelligence section [both of the army ordnance administration] and Sundin [engineer at the intelligence section at the time])
  1. The Russians started committing a great deal of resources to the AFV sector as early as in the 1920's. It is a very telling fact that during the 1931-1939 period, when other great powers held trials with maybe 5-10 different tank types and took 3-4 types to series production, the Russians trialed 32 different tank designs, both foreign and domestic, and took 10 different types to significant series production runs. The Russian tanks have heavily influenced the tank and anti-tank technology of other countries ever since the late summer of 1941, when the Russians surprised the Germans with the T-34 tank. For a long time - since 1944 - our best reference manuals on armored fighting vehicle technology have been Russian works. 
  2. Our current knowledge regarding Russian AFV's is documented on a number of datasheets, which are kept at the army attache office. The general characteristics of these vehicles will be shown on the following slides:
    1. T-34-85, IS-3 (both 1945)
    2. T-54, T-10, PT-76, ASU-57 (four different chassis types)
    3. APC (8 wheels) 
    4. SU-100 - T-54 chassis
    5. ZSU-57-2 - T-54 chassis
    6. ISU-152 - T-10 (IS-3) chassis 
    7. "SU400"- T-10 (IS-3) chassis 
    8. BTR-50 - PT-76 chassis
    9. "SU-85/62" - PT-76 chassis
    10. Rocket launcher vehicle - PT-76 chassis
    11. Artillery tractor - ASU-57 chassis
  3. Regarding new AFV's, the following intelligence is of primary interest:
    1. Photos or drawings
    2. Designation 
    3. Type of armament and armament characteristics (gun bore, guided missiles, any electronics, turret or fixed casemate) (Handwritten note next to point 3) Card with this text provided to the army attache. The attache said he would request that a tank expert be sent over to be present at parades and other such events in the future.")
    4. Weight (chassis class, number of road wheels)
    5. Amphibious capability or lack of such capability
    6. Presence of external armor screens or such things (on heavier tanks and other well armored vehicles)
    7. Night fighting equipment"