How Engineer's RPG/Smaw damages tank

My choice for engineer is always RPG/Smaw. I don't use Javelin because I need to get a lock on target, it takes time to travel and is relatively easy to evade completely using smoke. It also has very little ammo even with the explosive perk. Javelin would be a killer with effective laser targeting, but that never happens on public games which I play mostly. Igla and Stinger on the other hand are pretty much a joke against any experienced jet or chopper pilot.

This post demonstrates how the damage system works against battle tanks. If shot correctly RPG/Smaw can disable a tank in one hit. There are two variables affecting the damage: angle and direction.

Tank has four sides: front, two sides and rear. Every tank has the strongest armor in front to have best armor confronting enemies. Sides are a bit weaker and rear being the weakest. As you can see from the image on the right a direct hit from the front makes 21% damage to the tank while shooting from the rear it makes up to 55%, hence, disabling the tank in one hit.

The other variable is angle. You make the most damage to a tank when you shoot it in a 90 degree angle. Any angled shot has highly reduced damage compared to a direct hit from 90 degrees. As the image shows, angled shots to the front and sides only make 18% damage and are the worst possible numbers from a single rocket. If shooting in angle it takes up to 3 rockets to disable a tank which is way too many to stay alive on foot and if there is an engineer fixing the tank it's impossible. Even the damage to the rear is greatly reduced (down to 31%) when shot in an angle. Now when you are hiding in the jungle and waiting to shoot down a tank, think of these numbers.

Note that the numbers in the picture are not a 100% guaranteed. Sometimes there are small changes.

It's pretty much obvious you should always try to get behind the tank or at least get a clean hit from the side. The first impact should count for disabled/nearly disabled tank. When on a disabled state a tank will leak health quickly and it will be easy to finish it off. Even the 36% chunk off tank's health makes the tank's screen go fuzzy and makes it harder to identify you from your hiding position. Most likely when tank takes heavy damage enemy soldiers exit the tank either to repair or run away and makes them an easy target for your main gun.

Below is a pretty thorough YouTube video of testing these mechanics. This video was published on April 22nd. The damage numbers have changed in new patches so the numbers you see in the video are different than my numbers here. Credits to Joshuanelsn for the upload.

There are also numbers in the video description for Javelin and C4 hits. Those actual numbers might be different today, but they should give you general idea.