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Message: <blockquote data-quote="dave2008" data-source="post: 7703928" data-attributes="member: 83242">I didn't suggest that, that was someone else.That is not how it works (of course plate armor is not close to 1/4" thick, but I get your point).  If you have two 1/4" sheets of steel, one that is 2' x 2' and another that is 6' x 6' they do not have the same design load capabilities.  Armor is more complex, but it is conceptually similar to a floor diaphragm which I work with in building design all the time.  The more spread out the diaphragm the thicker it needs to be.  I rule of thumb in construction is 1" per foot of span.  So it you have a floor span of 24', you roughly need 24" of floor structure (usually steel and concrete).  If you decrease that to 8' you would only need 8" with similar materials by the rule (in reality you could span 8' with only 4" of concrete and steel but you get the idea). I agree, but in 5e I don't think that is the way to handle it.  I think large size armor should have higher AC, just like large size weapons do more damage.That was not a claim I made.  I posted the math for proportionally scaled armor that indicated even if the armor is 3x as thick (which I agree it would not need to be) it would still be feasible for a fire giant to wear it. I did claim that I like some bit of fantastic engineering in my fantasy creatures, equipment and castles.</blockquote>