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Large Mecha Issues

Journal Entry: Mon Apr 28, 2008, 11:45 AM
I like most of what i see, but just one point that gets overlooked in the large mecha categaory; Ground pressure. Large armoured Biped has an immense amount of ground pressure. any soft terrain will bog it down unless the feet are large enough to reduce the ground pressure. In Urban terrain it would just fall through the street into the sewer. Tanks have the large tracks to reduce the ground pressure for the 70 ton metel monster rolling around. Mecha still have to face the ground pressure problem in whatever environmet they are going to travel.

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*Bzzzt:iconBzzzt: May 5, 2008, 1:56:53 PM
Why did I never think of that ... the spiderborgs would just pierce with their legs through everything like needles through fabric ... all thou there is a solution - counter thrusters or just support devices like hover engines reducing the t/cm2 ratio - I know that would require insane amount of fuel/energy ... but hell who said borgs are real :D

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I'm so good at being bad ... but I'll try to be better.
*plugz:iconplugz: May 5, 2008, 8:21:55 PM
Brilliance. I too have noticed that people dont take in to account the physics of such in mechanical pieces. These things weigh tons. I mean come on people.

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I type in Comic Sans to make people angry.
~loki223:iconloki223: May 8, 2008, 9:51:19 AM
Some rules can be bent, others can be broken.
You think that is air your breathing?

It's all made up but how made up is the question?
*DonSimpson:iconDonSimpson: May 8, 2008, 11:21:10 AM
Yes, ground pressure. Heavy stuff can't go anywhere with soft ground or wood floors, etc. There's an article I ran across once on the amount of damage caused anually by high-heeled shoes (which concentrate the force, like a nail), and that's just at people weight. And inertia. Heavy things don't start or stop easily. And the more weight there is at the end of an arm or leg, the more time and energy it takes to get it moving and to stop it moving, and the more it displaces the center of gravity, which requires more energy to compensate for (which is why most animal legs taper down to the feet, with most of the muscles near the body) and makes the body wobble about to keep the COG inside the weight bearing points, because if they go outside that area, the body falls over (biped walking is just continually falling over and then catching by moving the feet). Someone pointed out that if someone is in a mecha and it falls over, they get the same impact as if they fell from the same height (which is why some mecha designers give their pilots gel impact suits). When that Imperial Walker fell over, the crew basically fell several stories. And fuel. Probably a lot of mecha have supercompact fusion power plants, or matter/antimatter systems, because they are using all that energy. Though there's a funny scene in the anime Madox where the hero has to refuel at a gas station. And where do the ones not using energy weapons keep all that ammo, anyway?
~loki223:iconloki223: May 8, 2008, 3:38:06 PM
Take a look at any Battletech design. they take into account for all the weapons and ammo and nearly everything you can imagine, but not ground pressure. Its sorta funny.

When I was in the Army (i was both Marines and Army) I rode as a gunner on an M1A2 SEP variant Abrams tank. Its like 70-75 tons. and just driving on dry dirt in Texas it would sink about 2-3 inches into the ground. The Tracks have big rubber pads on them so they don't tear apart the pavement roads when they drive down them.

Imagine the depth of the foot print of a 70 Ton Biped war machine walking or on the run. At the minimum your looking at doubling or more that impression in the ground, and pavement, without some type of rubberized protection on the feet, every road they crossed would be shredded.

Don't get me wrong, I love anime mecha like robotech and macross and such, but that one tidbit is just a pet peeve of mine.

Please don't stop drawing it, please, for me, someone draw just one, with the appopriate sized feet. ;-)
*DonSimpson:iconDonSimpson: May 9, 2008, 2:22:07 AM
There's a lot of mecha being pictured, with engineering running the full spectrum from bogus to very well thought out. I'd like to see that drawing, myself.
~loki223:iconloki223: May 9, 2008, 8:53:58 AM
It's probable that once the physics were applied, it really wouldn't be that cool looking.

Even with advanced polymers, High speed metals, and micro fusion reactors. ;)