Hello guys! Sorry about my english.
I was searching about the IS-3 side armor. It's usually quoted as 90mm and 30mm spaced armor. Let's see a picture about the armor schema.
However, I was digging about that side armor and found some images with a different armor thickness. For example:
As you can see, those 30mm aren't real in that photo. I continued checking about that and found a discussion in a world of tanks forum: http://forum.wotlabs...-spaced-armour/
The conclusion is the first IS-3 had a 30mm side armor and after upgrading the tank, they converted the side armor in bins, so the IS-3 lost it's 30mm thinkness in favor of the extra espace for tools. I tried to research about it, but I had little success. I found pictures about IS-3M, the upgrade with the bins, but I found some IS-3 with bins also (called IS-3 instead of IS-3M - Bariatinsky).
I need a little help at this point. There are people with a lot of information in this forum, so does anyone know if the side thinckness of the IS-3 was 30mm anytime or if it was always less?