The tier 7 Japanese heavy tank O-Ni is a slow heavily armored tank. For a tier 7 heavy tank it is massive not only in size but also with its armor. This guide will outline all World of Tanks O-Ni weak spots. It also breaks down the armor to provide effective armor values. Green areas are the weakest armor found in a specific area on the O-Ni. Yellow and orange are moderately armored areas. Finally red areas are the toughest armor to penetrate. Purple areas have no hull armor to cause HP damage.
World of Tanks O-Ni Weak Spots | Frontal
Located frontally on the O-Ni is most of its impressive armor It has several sections above 235mm effective armor that protects it from most tanks. Starting on the lower hull you have the lower glacis having only 193mm effective armor. The upper glacis armor above it has 202mm effective armor. This is weak against tier 8-9 tanks. However tier 5-7 tanks will struggle to penetrate it reliably. The Driver Plate located beneath the mini-turrets has an impressive 247mm effective armor value.
Further up the O-Ni’s frontal armor you have two small turrets that are viable weak spots. Focus on hitting the flat areas on the mini turrets since it is 175mm effective. The angled armor plate located behind the small turrets has the same armor as the drivers plate(175mm at 45°) giving it 247mm effective armor.
The turret of the O-Ni is a tough nut to crack for tier 5-7 tanks. Tier 8 and 9 tanks will be able to penetrate the turret with some ease. This armor guide uses the 10cm experimental gun which has a stronger mantlet, with a minimal 250mm effective armor rating on the sloped sections around the gun. The flat sections located further back on the turret(still on the mantlet) only has a 200mm-205mm effective armor rating and is semi-weak.
If the O-Ni uses the 15cm most of the mantlet is 200mm effective armor. Just below the gun actually only has 35mm(eek) effective armor. Outside of the mantlet you have a small red strip of 220mm armor and then the orange area drops down to 200mm thick. Avoid shooting the turret sides since they are angled very well.
Finally the commander’s hatch on top of the O-Ni is fairly easy to deal with. The center mass of the hatch has 150mm effective armor. As you move out towards the edges the armor drastically increases. Therefore, you should stick to aiming at the center of the commander’s hatch.
World of Tanks O-Ni Weak Spots | Side
The O-Ni’s side is very poorly armored. Surprisingly it is actually weaker than the rear armor. There is a 35mm spaced armor plate covering the lower side hull and also 40mm tracks but it doesn’t make up for the very thin side hull armor. The upper side hull is only 70mm thick above the spaced armor/tracks. If you have a shot on the side hull simply avoid using HEAT on the spaced armor section. If you aim higher up the small turrets and side turret armor has a minimal of 152mm effective armor.
World of Tanks O-Ni Weak Spots | Rear
The rear armor of the O-Ni is a pinch stronger than the side armor. The rear hull, rear turret, and commander’s hatch all have 150mm thick armor. There are a few small areas on the engine deck that are only 30mm and are able to be overmatched by a 91mm+ round. If you approach the rear of the O-Ni with the “keep it simple” mindset and just aim at the large flat areas you will have no problems.