The damage that a tank takes from flamethrowers, even at point blank range, varies wildly depending on the positioning and angle of the attacker. This is the result of a combination of three factors:
The direct damage of a flame particle decays over time
The direct fire damage a target takes is based on the oldest flame particle currently in contact with their hitbox
tanks have massive hitboxes, allowing flame particles to potentially linger inside them for almost the entirety of their lifespan
This can cause as much as a 50% damage reduction between "optimal" (standing in front of the tank and firing directly up) and "worst case" (standing behind the tank and firing straight) positioning
The damage that a tank takes from flamethrowers, even at point blank range, varies wildly depending on the positioning and angle of the attacker. This is the result of a combination of three factors:
This can cause as much as a 50% damage reduction between "optimal" (standing in front of the tank and firing directly up) and "worst case" (standing behind the tank and firing straight) positioning