IS-5 (Object 730)
IS-5 (Object 730)
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[Client Values; Actual values in
10,800  Cost |
| 1550310 HP Hit Points |
| 49.05/54.924.49/54.9 t Weight Limit |
- Commander (Radio Operator)
- Gunner
- Driver
- Loader
| 700700 hp Engine Power |
| 42/14 km/h Speed Limit |
| 2626 deg/s Traverse |
| 14.2728.58 hp/t Power/Wt Ratio |
| NoNo Pivot |
| // mm Hull Armor |
| 201/129/90201/129/90 mm Turret Armor |
APCR/HEAT/HE
APCR/HEAT/HE Shells |
1180/5200/608
1180/5200/608 Shell Cost |
| 390/390/530390/390/530 HP Damage |
| 221/270/61221/270/61 mm Penetration |
|
4.76 r/m ▲
4.76 r/m Standard Gun ▲ Rate of Fire Standard Gun |
|
1856.4 ▲
Standard Gun
▼
Standard Gun
▲
1856.4 Standard Gun ▲
Standard Gun
▼
Standard Gun
▲ Damage Per Minute Standard Gun |
|
0.46 m ▲
0.46 m With 50% Crew: 0.57 m ▲ Accuracy With 50% Crew: 0.57 m |
| 3.2 s 3.2 s Aim time |
| 2424 deg/s Turret Traverse |
| 360° Gun Arc |
| -7°/+17°-7°/+17° Elevation Arc |
| 3030 rounds Ammo Capacity |
| 1515 % Chance of Fire |
| 360 m 360 m View Range |
| 730 m 730 m Signal Range |
VIII
10800
The IS-5 (Object 730) is a Soviet tier 8 premium heavy tank.
The development of the vehicle was started in 1949 by the Design Bureau of the Chelyabinsk Kirov Plant under the supervision of Joseph Kotin. In 1950 a preproduction batch of 10 vehicles was launched. After the vehicle underwent all trials and received upgrades, it was adopted for service in 1953 under the designation IS-8.
Modules / Available Equipment and Consumables
Modules
Guns
| Tier | Gun | Penetration (mm) |
Damage (HP) |
Rate of fire (rounds/minute) |
Dispersion (m/100m) |
Aiming time (s) |
Weight (kg) |
Price (  )
| |
|---|---|---|---|---|---|---|---|---|---|
| VIII | 122 mm D-25TA | 221/270/61 | 390/390/530 | 4.76 | 0.46 | 3.2 | 2590 | 125140 |
Engines
| Tier | Engine | Engine Power (hp) |
Chance of Fire on Impact (%) |
Weight (kg) |
Price ( )
| |
|---|---|---|---|---|---|---|
| IX | V-12-5 | 700 | 15 | 1024 | 84000 |
Suspensions
| Tier | Suspension | Load Limit (т) |
Traverse Speed (gr/sec) |
Rmin | Weight (kg) |
Price ( )
| |
|---|---|---|---|---|---|---|---|
| VIII | IS-5 (Object 730) | 54.9 | 26 | B/2 | 10000 | 30000 |
Radios
| Tier | Radio | Signal Range (m) |
Weight (kg) |
Price ( )
| |
|---|---|---|---|---|---|
| X | 10RKM | 730 | 100 | 52200 |
Compatible Equipment
Compatible Consumables
Player Opinion
Pros and Cons
Pros:
- Excellent shell velocity with standard (APCR) rounds, excellent penetration with premium (HEAT) rounds
- Very good turret armor, the hull is also well protected with its pike nose and spaced side armor
- Good gun depression for a Soviet heavy tank (-7 degrees)
- Very good top and reverse speed
- Crew slots match most high tier Soviet heavy tanks
Cons:
- Fairly low DPM
- Abysmal aim time and accuracy, the gun is very unwieldy
- Pike nose loses most of its effectiveness when improperly angled
- Very high terrain resistance, won't reach its listed top speed on unpaved terrain
- Very poor viewrange
Performance
One of the better tier 8 Russian premiums, as it still has much of the speed of the IS-3, while not having the penetration issues that the IS-6 and KV-5 have. The armor is very good in top tier games, as the pike nose is 120mm thick and very well sloped, but the lower plate is quite weak. The side armor is typical high tier IS line side armor, a black hole if anyone shoots the spaced side. Above that, the armor is 120mm still, so a little angling can still bounce shells. By far, the worst aspect of this tank is the abysmal aim time and accuracy. Other than that, a very good premium that doesn't need to spam HEAT at tanks its same tier.
- In 1.13 the IS-5 was buffed:
Gun handling from 0.24/0.24/0.16 -> 0.20/0.20/0.10, an absolutely massive gun handling buff. Gun depression from -5 -> -7, granting it extreme gun depression for a Russian tank.
Early Research
Premium tank, comes elite in its stock configuration.
Suggested Equipment
Gallery
Historical Info
The development of this vehicle started in late 1948. The goal was nothing less than complete overhaul (modernization) of the IS-4 heavy tank in order to increase its performance. The designers of the vehicle (Chelyabinsk plant) proposed to replace a number of internal components and to make the entire vehicle weigh less (specifically, to lower the weight from IS-4′s 60 tons to 50 tons. This “slimming”, along with the use of modernized engine was to assure better combat characteristics.
The early variant of Object 730 was developed in Spring 1949 by the Chelyabinsk Tractor Plant (ChTZ) by a team led by Zh.J.Kotin. It was quite different from the original IS-4, especially the turret was reworked to implement the lessons learned during the IS-3 and IS-7 development. The transmission, suspension and loading mechanism were updated as well, the combat and engine compartments also underwent complete overhaul. The new modernized turret was cast with variable thickness and was fitted with the classic D-25T gun in a new mount, that was sturdier and also easier to fix and install. The gun was fitted with new electromechanical shell loading assistant for higher rate of fire.
In early April 1949, the full set of documents along with a wooden mock-up was sent to Moscow. There, the representatives of the army and the industry checked it out and made a list of required improvements to the design. The design was updated as a result and in May 1949, it was approved. After that, the designers started working on assembly documents for the most difficult to produce components first, as the production of a new tank took a significant effort to organize. The documents were ready in late June 1949.
The assembly of the prototypes was delayed however and it was decided to use modified IS-4 vehicles as prototypes instead. In order to meet the testing deadline (which was August 1949), the designers took two IS-4 tanks and reduced their weight to 50 tons by removing the turrets and using mockup weight blocks instead. The V-12 engine in the prototypes produced 700 horsepower, the stronger, modified V-12-5 appeared only later. A whole set of modules for the future Object 730 was also tested on the IS-7 prototypes, modified for this task. And so was the summer of 1949 filled with testing of various components of the vehicle in various ways.
The first real hull of the true Object 730 was ready on 30.7.1949, second hull arrived on 9.8.1949 in Chelyabinsk. At this point, the assembly of both tanks was further delayed, as some of the components were still not developed properly or were still being tested. Nevertheless, the first prototype was ready in mid-September 1949. The first prototypes still had an older engine cooling model and 6-gear planetary transmission.
Both vehicles were factory-trialed in September 1949, but these trials ended in failure, specifically the transmission proved to be problematic. As a result, it was decided to use a different, 8-gear planetary transmission. Both the 6-gear and the newly designed 8-gear one were tested against one another and the test showed the superiority of the new design. This change (along with several others) were implemented into the Object 730 project by the end of 1949. A new iteration of Object 730 documents appeared in January 1950 with this (and other changes) already implemented.
In March 1950, three more (already improved) prototypes were built and in mid-April 1950, the prototypes underwent series of difficult trials. The results were positive and all three prototypes fulfilled the requirements. The vehicles were judged to be more reliable than other contemporary medium tanks and there was room for modernization as well. More trials followed and in summer 1950, the project was polished and 10 vehicles were built. These were sent to various sites for military trials and despite some shortcomings of the suspension, they again passed them successfully.
Despite these successes however, the tank was not accepted in service, as by the end of 1950, a new list of requirements for the project was issued by the arty and the ministry of transportation. This new list required a significant overhaul, which would eventually take years to complete and by the end, the vehicle would recieve a new designation, the IS-8. It would eventually be accepted in service as the T-10 in 1953. Even though the Object 730 (IS-5) was not mass-produced, it allowed the development of various modern components, later used for the IS-8 tank.
