O-I Experimental

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O-I Experimental

Japan | Heavy Tank | Tier V

Battle Tier

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Overview
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Well, the ones further down, of course.

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[Client Values; Actual values in

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Specifically, the mismatch in crew values caused by commander's 10% crew skill bonus. Outside of a crew of 1 commander only, 100% crew is a fiction. The client values, given for 100% crew, will normally be taken into battle with 110% crew skill members aside from specific functions, causing their actual performance to deviate from the expected client value. These differences are taken into account in tooltip boxes.

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445,000   Cost

920184 HP Hit Points

99.1/100.530/105.5 t Weight Limit

Crew

1. Commander
2. Gunner
3. Driver
4. Radio Operator
5. Radio Operator
6. Loader

Mobility

11001200 hp Engine Power

25/12 km/h Speed Limit

2022 deg/s Traverse

11.140 hp/t Power/Wt Ratio

NoNo Pivot

Armor

// mm Hull Armor

125/75/75125/75/75 mm Turret Armor

Armament

{{#ifeq:HOLLOW_CHARGE|ARMOR_PIERCING|| {{#ifeq:HIGH_EXPLOSIVE|ARMOR_PIERCING|| AP/HEAT/HE {{#ifeq:HOLLOW_CHARGE|ARMOR_PIERCING|| {{#ifeq:HIGH_EXPLOSIVE|ARMOR_PIERCING|| AP/HEAT/HE Shells

130/4800/240 130/4800/240 Shell Cost

360/360/440360/360/440 HP Damage

60/140/6060/140/60 mm Penetration

| |}} | |}} 5.71 r/m  ▲ Standard Gun Reload Times Nominal: 10.5 s 50% Crew: 13.01 s 75% Crew: 11.36 s 100% Crew: 10.07 s Rammer: 9.06 s Vents: 9.85 s Both: 8.86 s Both and BiA: 8.67 s Both and Max Crew %: 8.31 s See Crew, Consumables, or Equipment for more information. | |}} | |}} 5.71 r/m  ▲ Standard Gun Reload Times Nominal: 10.5 s 50% Crew: 13.01 s 75% Crew: 11.36 s 100% Crew: 10.07 s Rammer: 9.06 s Vents: 9.85 s Both: 8.86 s Both and BiA: 8.67 s Both and Max Crew %: 8.31 s See Crew, Consumables, or Equipment for more information. Rate of Fire

| |}} | |}} 2055.6 ▲ Standard Gun Using Shell Type 1 (360 Damage): Theoretical Damage Per Minute Nominal DPM: 2055.6 50% Crew: 1659.6 75% Crew: 1900.8 100% Crew: 2145.6 100% Crew Vents: 2192.4 Rammer: 2383.2 Both: 2437.2 Both and BiA: 2491.2 Both and Max Crew %: 2599.2 Advantageous Damage Per Minute First-shot DPM: 2415.6 50% Crew: 2019.6 75% Crew: 2260.8 100% Crew: 2505.6 100% Crew Rammer: 2743.2 Vents: 2552.4 Both: 2797.2 Both and BiA: 2851.2 Both and Max Crew %: 2959.2 See here, here, or here for more information. ▼ Standard Gun Using Shell Type 2 (360 Damage): Theoretical Damage Per Minute Nominal DPM: 2055.6 50% Crew: 1659.6 75% Crew: 1900.8 100% Crew: 2145.6 100% Crew Vents: 2192.4 Rammer: 2383.2 Both: 2437.2 Both and BiA: 2491.2 Both and Max Crew %: 2599.2 Advantageous Damage Per Minute First-shot DPM: 2415.6 50% Crew: 2019.6 75% Crew: 2260.8 100% Crew: 2505.6 100% Crew Rammer: 2743.2 Vents: 2552.4 Both: 2797.2 Both and BiA: 2851.2 Both and Max Crew %: 2959.2 See here, here, or here for more information. ▲ Standard Gun Using Shell Type 3 (440 Damage): With wholly penetrating hits Theoretical Damage Per Minute Nominal DPM: 2512.4 50% Crew: 2028.4 75% Crew: 2323.2 100% Crew: 2622.4 100% Crew Vents: 2679.6 Rammer: 2912.8 Both: 2978.8 Both and BiA: 3044.8 Both and Max Crew %: 3176.8 Advantageous Damage Per Minute First-shot DPM: 2952.4 50% Crew: 2468.4 75% Crew: 2763.2 100% Crew: 3062.4 100% Crew Rammer: 3352.8 Vents: 3119.6 Both: 3418.8 Both and BiA: 3484.8 Both and Max Crew %: 3616.8 See here, here, or here for more information. | |}} | |}} 2055.6 ▲ Standard Gun Using Shell Type 1 (360 Damage): Theoretical Damage Per Minute Nominal DPM: 2055.6 50% Crew: 1659.6 75% Crew: 1900.8 100% Crew: 2145.6 100% Crew Vents: 2192.4 Rammer: 2383.2 Both: 2437.2 Both and BiA: 2491.2 Both and Max Crew %: 2599.2 Advantageous Damage Per Minute First-shot DPM: 2415.6 50% Crew: 2019.6 75% Crew: 2260.8 100% Crew: 2505.6 100% Crew Rammer: 2743.2 Vents: 2552.4 Both: 2797.2 Both and BiA: 2851.2 Both and Max Crew %: 2959.2 See here, here, or here for more information. ▼ Standard Gun Using Shell Type 2 (360 Damage): Theoretical Damage Per Minute Nominal DPM: 2055.6 50% Crew: 1659.6 75% Crew: 1900.8 100% Crew: 2145.6 100% Crew Vents: 2192.4 Rammer: 2383.2 Both: 2437.2 Both and BiA: 2491.2 Both and Max Crew %: 2599.2 Advantageous Damage Per Minute First-shot DPM: 2415.6 50% Crew: 2019.6 75% Crew: 2260.8 100% Crew: 2505.6 100% Crew Rammer: 2743.2 Vents: 2552.4 Both: 2797.2 Both and BiA: 2851.2 Both and Max Crew %: 2959.2 See here, here, or here for more information. ▲ Standard Gun Using Shell Type 3 (440 Damage): With wholly penetrating hits Theoretical Damage Per Minute Nominal DPM: 2512.4 50% Crew: 2028.4 75% Crew: 2323.2 100% Crew: 2622.4 100% Crew Vents: 2679.6 Rammer: 2912.8 Both: 2978.8 Both and BiA: 3044.8 Both and Max Crew %: 3176.8 Advantageous Damage Per Minute First-shot DPM: 2952.4 50% Crew: 2468.4 75% Crew: 2763.2 100% Crew: 3062.4 100% Crew Rammer: 3352.8 Vents: 3119.6 Both: 3418.8 Both and BiA: 3484.8 Both and Max Crew %: 3616.8 See here, here, or here for more information. Damage Per Minute

| |}} 0.54 m  ▲ With 50% Crew: 0.669 m With 75% Crew: 0.584 m With 100% Crew: 0.518 m With BiA: 0.506 m With BiA and Vents: 0.495 m Maximum possible: 0.475 m For more details, see Crew | |}} 0.54 m  ▲ With 50% Crew: 0.669 m With 75% Crew: 0.584 m With 100% Crew: 0.518 m With BiA: 0.506 m With BiA and Vents: 0.495 m Maximum possible: 0.475 m For more details, see Crew Accuracy

| |}} 2.9 s  ▲ With 50% Crew: 3.592 s With 75% Crew: 3.137 s With 100% Crew: 2.781 s With GLD: 2.528 s With BiA: 2.719 s With BiA and Vents: 2.66 s With both and GLD: 2.418 s Maximum possible: 2.318 s For more details, see Crew or Equipment | |}} 2.9 s  ▲ With 50% Crew: 3.592 s With 75% Crew: 3.137 s With 100% Crew: 2.781 s With GLD: 2.528 s With BiA: 2.719 s With BiA and Vents: 2.66 s With both and GLD: 2.418 s Maximum possible: 2.318 s For more details, see Crew or Equipment Aim time

2020 deg/s Turret Traverse

360° Gun Arc

-10°/+20°-10°/+20° Elevation Arc

120120 rounds Ammo Capacity

General

2020 % Chance of Fire

360 m  ▲ With 50% Crew: 282.8 m With 75% Crew: 321.5 m With 100% Crew: 360 m With Recon and Situational Awareness: 378.2 m With Coated Optics: 396 m With Binocular Telescope: 450 m Maximum possible: 515.4 m For more details, see Skills or Equipment 360 m  ▲ With 50% Crew: 282.8 m With 75% Crew: 321.5 m With 100% Crew: 360 m With Recon and Situational Awareness: 378.2 m With Coated Optics: 396 m With Binocular Telescope: 450 m Maximum possible: 515.4 m For more details, see Skills or Equipment View Range

| |}} 300 m  ▲ With 50% Crew: 242.2 m With 75% Crew: 277.4 m With 100% Crew: 312.9 m With 100% Signal Boost: 360 m When affected by 100% Relaying: 330 m Maximum possible: 450.4 m For more details, see Skills or Equipment | |}} 425 m  ▲ With 50% Crew: 343.1 m With 75% Crew: 392.9 m With 100% Crew: 443.2 m With 100% Signal Boost: 510 m When affected by 100% Relaying: 467.5 m Maximum possible: 638 m For more details, see Skills or Equipment Signal Range

Values are Stock - click for TopValues are Top - click for Stock

O-I Experimental

V

445000

The O-I Experimental is a Japanese tier 5 heavy tank.

Development of this superheavy tank was initiated by Colonel Iwakuro from the Army Ministry of Japan. The project was carried out by the Mitsubishi company, therefore the vehicle became known as the Mi-To. In the army, the tank was designated the O-I. Details of the project are largely unknown.

The O-I Experimental marks the end of its Japanese heavy line.

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 ()
IV	7.5 cm Tank Gun Type 3	90/112/38	115/115/175	16.67	0.4	2.1		1400	30500
V	7.5 cm Tank Gun Type 5	124/155/38	125/125/175	16.22	0.39	2.3		1489	42500
V	12 cm Short Barrel Gun	60/140/60	360/360/440	5.71	0.54	2.9		634	44000

Engines

Tier	Engine	Engine Power (hp)	Chance of Fire on Impact (%)		Weight (kg)	Price ()
VII	2x Kawasaki Type 98 V-12 (550)	1100	20		1020	51000
VIII	2x Kawasaki Type 98 V-12 (600)	1200	20		1020	77500

Suspensions

Tier	Suspension	Load Limit (т)	Traverse Speed (gr/sec)	Rmin		Weight (kg)	Price ()
IV	O-I Experimental	100.5	20	B/2		20000	4000
V	O-I Experimental Kai	105.5	22	B/2		20000	11400

Radios

Tier	Radio	Signal Range (m)		Weight (kg)	Price ()
II	Type 94 Mk. 4 Otsu	300		40	0
IV	Type 94 Mk. 4 Hei	350		90	2350
VI	Type 96 Mk. 4 Bo	425		50	14000

Compatible Equipment

                   

Compatible Consumables

                      

Player Opinion

Pros and Cons

Pros:

- 300Alpha damage, best in class - Good Fire control - Good reload time, essentially providing good DPM with minimal exposure - Good top speed that is easily reached on flat ground - 100 ton tank that can deal serious ramming damage - Decent frontal armor with no real weakspot - 10 degrees of gun depression - High module and crew HP, module damage and crew death are rare

Cons:

- Largest tank ever at Tier5, easy to hit - Poor Camouflage value - Armor isn't great - Poor Premium round pen - Slow acceleration, although given the weight and size it is still unreasonably good - Armour is very flat, turret seems very weak

Performance

Fully upgraded, the Mighty Bentobox is a very strong tank. 300 alpha is unheard of for tier 5 heavies since the removal of 107mm on the KV tank way back then, and the only other tank to have 300 alpha at tier 5 is the French S-35CA with the 105mm gun. Coupled with surprisingly good mobility and extremely good gun handling, it is very very good at peek-a-boom and midrange snapshots. Another important feature to be noted is the -10 degrees of gun depression: You can hulldown peek-a-boom very easily and without a giant cupola on the turret, exposure while doing so is minimal. Last but not least, the armor is decent, there is no frontal "weakspot" to speak of, with some angling it will bounce same tier 75mm~76mm rounds with reliability.

Early Research

Suspension does not have to be researched to mount other modules; therefore players can straight up research the 10cm first and then do the engine/suspension in the order they please.

The two 7.5cm may already be unlocked if you have played the medium line. Otherwise, you have the stock 12cm derp gun to use. The stock derp gun is similar to the Russian U-11 122mm derp gun in performance, but has noticeably slower shell velocity; therefore players should try to get close to the enemy to have a decent chance of hitting the enemy. The stock 12cm leads to both the 75mm guns and the main feature of this Bento box of a tank: the 10cm. The 10cm cannon is required to unlock the O-I and is well worth the upgrade as it is the only heavy tank that does 300 damage per shot in tier 5, and does it with good precision, fire control, and good reload rate to boot. The only drawback of this gun is that the premium AP round does not offer significant penetration advantage over the standard AP, and may run into trouble facing heavily armored tanks in higher tiers, so be sure to read the teamlist for expected enemies at each map location and plan ahead.

Stock suspension is good enough to handle every module, but upgraded one can make the tank noticeably more nimble.

The upgraded engine is quite expensive in terms of XP, but this engine carries over right up the line of heavy tanks, so it's well worth the investment. The radios also carry over up the line.

Gallery

Historical Info

After the Battles of Khalkhin Gol with Soviet Union in 1939, Japan tried to improve its tank design using lessons learnt from this battle. Many Japanese tanks such as Type 95 Ha-Go light tank and Type 97 Chi-Ha medium tanks were proven to be insufficient to encounter Soviet armored forces. Larger tank design was urgently needed. A super heavy tank project was proposed along with new medium tank designs.

In 1940, Hideo Iwakuro Colonel from the Army Ministry of Japan (陸軍省 Rikugun-shō) ordered the Army Engineering Division to develop a new super heavy tank. Iwakuro Colonel also indicated that the new tank should be at least two times larger than the current Type 95 Heavy Tank(26 tonnes).

The fifth Army Engineering Division carried out the project secretly and completed a prototype by the end of 1940. The 100 tonne prototype was equipped with a 105mm cannon and could carry over one hundred shells for its main gun. Its secondary armament consisted of a 75 mm cannon and a 7.7 mm machine gun.

The frontal hull of the tank was protected by a 75 mm thick armor and another 75 mm steel plate could be attached to provide additional protection. The side armor of the tank was only 35 mm but it could also attach 35 mm steel plate if needed.

During test trials, engineers realized that it would be highly challenging to deploy this tank. The weight of O-I tank added too much pressure on its suspension system and made it impossible to pass through uneven terrain. The prototype was therefore left in the factory and was scrapped in 1944 and its blueprint was later lost in the war.

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