madd0ct0r wrote:I've frequently seen the argument that power armour and mechs only make sense at the smallest scale - basically human sized or close to make use of the infrastructure.
The basic issue is we need infantry to go places armored vehicles cannot, you need them to build certain things like mineplanting, and as a secondary function of being a less lethal option for dealing with non combattants and enemy prisoners. Anything which can improve the performance of infantry is useful, but it cannot come at the expense of infantry being able to perform those functions. The first one is key, the other functions could be met by not having all infantry in armor.
Thus the power armor needs to be small, and a mecha with the pilot inside the torso is just already going to be too big, unless we have a midget for a pilot. That might actually be an option for someone like the USSR with conscription from a large population base and a limited mecha fleet, but in more reasonable terms it is not. You could be as big as a huge human, maybe bigger then any human and still more or less get the job done, but if your taller then any ceiling? Pointless.
Imagine trying to clear a trench line when the power armor is wider then the trench is for example, built by humans without armor. Wouldn't work very well and if you have to stay in the open, well, tanks were invented for that!
What if we were fighting on the aliens planet and they were kajui sized? So everything, from elevators to kerbstones are built at kajiu scale. Worth bringing out the robots then?
Ah that would be the 'giant stair world' concept of SDN past, I forgot who coined the term but it was silly and flawed. The problem is if you make the environment bigger then you don't need bigger infantry, you need LESS infantry! If no nooks and crannies exist in which you need infantry to exterminate enemy anti tank teams inside of, then why not just field more tanks? And self propelled guns, and multiple rocket launchers and trucks with mach 3 anti ship missiles and helicopter and aircraft ect..
You could perhaps negate the aircraft issue if the kaiju world had no air, or at least not enough air for planes of useful wing loading to fly in, but did have gravity, and I see no reason why kaiju must be oxygen dependent, one could surmise some chemosynthesis processes by which they might be powered instead, but that wouldn't resolve the ground vehicle issue. Even with no atmosphere at all we can power an AFV with bottled oxygen and conventional fuel, it'd be an explosive hazard but very workable. Cooling the engine would be a problem, but this is all a massive problem for giant robot design in all contexts anyway, not to mention the kaiju biology.
Also no atmosphere will also make rockets and guns much more effective since they face no drag losses, though missiles will have to become more complicated to use reaction jet control alone. On the other hand SPRINT was already completely controlled by reaction jets... and built in the 1960s. Lack of air will also make unguided weapons a lot more accurate, since no wind induced errors.
Now maybe if the battle was
inside the kaiju with a a kaiju so giant we deploy attack submarines into the blood stream, which deploy giant robots to hack at specific parts of the brain with a goal of damaging it to make the kaiju passive so we can train it like a dog... well yeah maybe we can come up with scenarios on these lines in which they make sense or at least are not overtly a really bad option. This sort of absurdity is also why I suggested maybe have giant robots originally designed for a non combat sort of purpose, but adapted to one. A super giant robot might be inferior to a giant tank made with the same technology, but if we already built the robot to play fetch with the kaiju to help domesticate, and the tank is 18 months from field trials... do what you have to do?
I also have had a pet idea on and off, which I have seen random internet art of so, I know its not a super original concept, of having giant robots which are actually giant monsters IN POWER ARMOR. But people usually want the main characters to be human, and not giant monsters in power armor crewing even more gigantic tanks. People are lame.
"This cult of special forces is as sensible as to form a Royal Corps of Tree Climbers and say that no soldier who does not wear its green hat with a bunch of oak leaves stuck in it should be expected to climb a tree"
— Field Marshal William Slim 1956