O-I Experimental
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O-I Experimental
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[Client Values; Actual values in
445,000  Cost |
| 920184 HP Hit Points |
| 99.1/100.530/105.5 t Weight Limit |
- Commander
- Gunner
- Driver
- Radio Operator
- Radio Operator
- Loader
| 11001200 hp Engine Power |
| 25/12 km/h Speed Limit |
| 2022 deg/s Traverse |
| 11.140 hp/t Power/Wt Ratio |
| NoNo Pivot |
| // mm Hull Armor |
| 125/75/75125/75/75 mm Turret Armor |
AP/HEAT/HE
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 ▲
5.71 r/m Standard Gun ▲ Rate of Fire Standard Gun |
|
2055.6 ▲
Standard Gun
▼
Standard Gun
▲
2055.6 Standard Gun ▲
Standard Gun
▼
Standard Gun
▲ Damage Per Minute Standard Gun |
|
0.54 m ▲
0.54 m With 50% Crew: 0.669 m ▲ Accuracy With 50% Crew: 0.669 m |
| 2.9 s 2.9 s Aim time |
| 2020 deg/s Turret Traverse |
| 360° Gun Arc |
| -10°/+20°-10°/+20° Elevation Arc |
| 120120 rounds Ammo Capacity |
| 2020 % Chance of Fire |
| 360 m 360 m View Range |
| 300 m 425 m Signal Range |
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.
Even after getting nerfed the O-I Experimental is an extremely powerful vehicle. Its 10cm gun with its whopping 300 alpha damage as well as the ability to pull of almost KV-5 levels of ram damage makes it a respectable opponent even for tier 7s. When top tier, it is a steamrolling killing machine, causing fear to any other tier 5 tank. Despite its gigantic size (not much smaller than the Maus!) and 100 ton mass (twice or even 3 times as heavy as other heavies of the same tier) the O-I Exp's armor is not very good. Instead, it trades that for absolutely unreal mobility for such mass, having the ability to keep up even with medium tanks!
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:
- Brutally high alpha damage rivalling heavies many tiers higher, best in class/tier
- Good reload time for its alpha damage, essentially providing good DPM with minimal exposure
- Good top speed that is easily reached on flat ground
- 100 ton tank that can deal extreme ramming damage when coupled with the aforementioned speed
- 10 degrees of gun depression
Cons:
- Largest tank ever at Tier 5, easy to hit, and camo is very poor
- While armor protects well against tier 3s and some tier 4s, even angled it struggles against same and higher tiers
- Poor premium ammo pen; being only 20mm higher than the regular AP shell
- 10cm gun has low shell velocity, accuracy and a long aim time
- Suffers from frequent ammorack damage
Performance
Being a very large replacement for the poorly armored Type 95 ,The O-I Experimental is a very strong tank. 300 alpha is unheard of for tier 5 heavies since the removal of 107mm on the KV tank, 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 extremely good at peek-a-boom and midrange snapshots. The O-I Exp is often a priority target because of its threatening gun, huge size and surprisingly weak armor, so taking hits is better suited for some other heavies like the KV-1, although when top tier the O-I Exp is still capable of bouncing some shots, especially from lower tiers. A relatively small turret and excellent -10 depression can somewhat negate massive size if you poke from ridge lines. Excellent mobility for such mass also allows the O-I Exp to play as massively overgrown medium with a 100mm gun. The O-I Experimental weighs twice as more as almost any other heavy from tier 5 to tier 7, so it can safely ram anything and do gigantic damage except to other Japanese heavies. When going downhill, the O-I Exp can destroy any same or lower tier tank, including heavies from full HP, and even some mediums and tank destroyers from a tier higher!
All in all, the O-I Exp has a very unique and unusual playstyle. It is still one of the strongest tier 5 tanks in the game. The O-I Exp is also one of the very best non-premium credit makers in the game, due to the ability to deal boatloads of damage and rarely needing to use premium shells because there aren't many tanks that normal AP cant penetrate. One last thing to note, despite similar looks, its bigger brother, the O-I, plays completely differently.
Early Research
Due to the fact that you can mount everything with the stock suspension, it is recommended that you start with getting the XP for the guns. try to get the 10 cm if you can. Top engine, suspension, and radio is secondary.
The two 7.5cm may already be unlocked from the tier 5 medium Chi-Nu. 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 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. Consider using the 120 mm Short barrel until you get enough Xp to get the 10 cm, as that should make the grind worth the effort. But, If you want to use the 75 or 76 mm gun first, you can, but, this course of action is not recommended. The upgraded engine is quite expensive in terms of XP, but this engine carries over right up the line of heavy tanks. It only adds 9% engine power so it's marginal if it is worth the investment. The radios also carry over up the line.
Gallery
Historical Info
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 partially complete prototype. The tank didnt have turrets or main armament mounted on and it weighted 97 tonnes. On full weight, the tank, known as "O-I", was supposed to weight up to 150 tons. The built prototype reached speed of 40kph on road, but with full weight it would have been much slower.
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.
Historical Gallery
Historical Accuracy Errata
While the incomplete prototype of the O-I was built, the tier 5 O-I "Experimental" itself more or less never existed.
- None of the armaments available in-game were ever considered on the O-I; the prototype itself didn't have armament mounted on. The main turret and 150mm gun were supposed to be mounted later.
- Tank is incorrectly smaller than O-I in all dimensions.
- Miniturret design on ingame O-I "Experimental" is incorrectly notably different than that of O-I.
- O-I "Experimental" is slightly heavier in-game than the real-life built prototype of O-I due to the aforementioned turret and gun.
Sources and External Links
| Light Tanks | IRenault Otsu • IIType 95 Ha-Go • IIType 97 Te-Ke • IIIType 97 Chi-Ha • IIIType 98 Ke-Ni • IVType 5 Ke-Ho |
| Medium Tanks | IIChi-Ni • IIType 89 I-Go/Chi-Ro • IVType 1 Chi-He • VType 3 Chi-Nu • VType 3 Chi-Nu Kai • VIType 4 Chi-To • VIIType 5 Chi-Ri • VIIISTA-1 • VIIISTA-2 • IXType 61 • XSTB-1 |
| Heavy Tanks | IIIType 91 Heavy • IVType 95 Heavy • VO-I Experimental • VIHeavy Tank No. VI • VIO-I • VIIO-Ni • VIIIO-Ho • IXType 4 Heavy • XType 5 Heavy |
| Tank Destroyers | |
| Self-Propelled Artillery |
