I have driven and worked around tanks for almost ten years now, and I'm not even kidding when I think there is real merit to the idea.
There are areas like wadis, ditches, ravines etc where treads or wheels don't work. I've seen several flipped or rolled vehicles as a result.
Anything which could step over or around obstacles would be valuable. Especially in less developed countries.
Something with arms or similar could maybe recover itself very quickly. This is a process that right now requires a heavy wrecker/recovery vehicle and at a minimum half an hour.
The potential to hit a mine or pressure plate for an IED is also way lower if you aren't rolling everywhere (at least in theory).
Nothing fifty feet tall, on the scale of Mechwarrior or anime or whatever. But it's not a totally crazy idea since we already operate 20-ton 8 wheeled vehicles with high ground pressures already.
Current technology definitely isn't there yet though. So my preference is of course still with the real deal. EDIT: Yup I realized the fictional setting bit, my bias still stands
I think for a tank you would want a quad leg system, more support when they gun fires. I think the first thing you would see would look like an 'up sized' version of the BostonDynamics LS3 - Legged Squad Support Systems or their BigDog.
One of the biggest advances we need to make in any sort of vehicles weaponry (boats, planes, tanks, trucks, etc) is to make them quieter. We are no longer doing large pitch battles with hundred of vehicles, so now being quiet as possible as we roll-up is important. Instead of a screeching/whining turbine engine running all the time, you might want a very quite electric motor to bring you the last mile or creeping/dashing on the battle field. That the issue with the current BigDog you have a squad of solider walking quietly through the woods and then this thing that sounds like a lawn mower following them...a mule would do the same thing and make far less noise.
TANGENT:
Eventually we might reach the fuel efficiency of a biological animal with a mechanical device that is faster, smarter, and senses more; but until we do I think there will be trade offs. And, my guess is what we make will make people uneasy because it will probably be 90% grown, with a computer augmented brain - a mule with a CPU in its head.
Yet, we can all see the ethics will be touchy. If its grown in a vat, if it is engineered in every system, is it still a mule? The ethics of things we MAKE that have brains, senses and feedback mechanisms of pain is huge even if we are making them from teh ground up using biological instead of mechanical processes. Is a grown machine a machine?
Are we willing to admit we are machines too? Do we dare admit we are merely biological machines when the final conclusion of such a thought is we are mere cogs in a society? Or, do we play the game of pretending humanity is special knowing it is a lie just so we don't enslave ourselves or view ourselves as cheaply as it would be logical to do? Seven billion people on earth and there have been 107,602,707,791 who have ever lived...are we REALLY special? Or, are we only as special as ants, single celled Paramecium, or rats? Why is a 'draft mule' ethical use, but a 'draft person' not? Wouldn't the logical argument be a draft person is repugnant, thus a draft mule is repugnant.
And, in that case is it 'more' ethical to make 'biological warriors' and 'biological mules' for war. Or, is it ALL unethical because humans are biological machines, AND the biological warriors & mules are biological machines so using anything in a way that puts it into harm or gives it no freedom is unethical? And, if a biological machine is not ethical...is a mechanical machine ethical?
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