Could modern roads withstand the weight of MS?

The future is now. This is the place for mecha and science.
Post Reply
False Prophet
Posts: 956
Joined: Thu Dec 31, 2015 7:40 am

Could modern roads withstand the weight of MS?

Your average Zaku II is 56.2 tons in dry weight (its max gross weight is 74.5 tons, according to MAHQ). I wonder if the modern highway systems in Western countries could withstand it? The basic Abrams is around 60 tons without weapons and men, and it could run on highways just fine. But then tanks use treads, which spread out the force instead of focusing just on the feet, right? And that is not to mention some MS have heels instead of flat feet, too.
User avatar
Seto Kaiba
Posts: 2235
Joined: Mon Feb 06, 2012 7:18 pm
Contact:

Re: Could modern roads withstand the weight of MS?

Wrong metric... it's not a question of weight, but rather of ground pressure.

Specifically, how much surface area you're spreading that weight across. Your average adult male exerts about 8psi on the ground while walking. Despite the M1 Abrams tank weighing upwards of 67t its ground pressure is only 15psi because that weight is spread across the large surface area of the tracks in contact with the ground. Your average Sport Utility Vehicle exerts around 25psi ground pressure, about the same as an adult horse.

To figure out the ground pressure of a Mobile Suit you'd need to know the surface area of the bottom of its foot and its weight.

The Mobile Suit's going to be at a major disadvantage since it walks, meaning its ground pressure for maneuvering is doubled (or more).
The Macross Mecha Manual
Yes, we're working on updates...
User avatar
MythSearcher
Posts: 1847
Joined: Sun Jan 20, 2013 4:36 pm

Re: Could modern roads withstand the weight of MS?

If you take the current design of MSs, you will find that most of them should have a pretty low ground pressure.

I made a sample image in scale before:
https://truth.bahamut.com.tw/s01/201705 ... 6d7363.JPG
PMX-003 The-O, M1A2 Abrams and RX-78-2 Gundam.
Look at the right foot of The-O(not the one in front that is enlarged)
and the MG model picture taken from Dalong:
https://truth.bahamut.com.tw/s01/201705 ... 9a8e7a.JPG

You can see that both MS, even with only one foot supporting all of their mass, should have more contact area than the Abrams tracks.
Granted, some parts of the bottom of a MS's foot may not be contacting the ground(like the thrusters commonly seen) but is still significantly more than the tracks.
The M1A2C(heaviest variant listed in Wikipedia) is 66.8t, while the max weight of RX-78-2 is 60t and 86.3t for The-O.
Zaku has a larger foot than RX-78-2 in most images.
https://truth.bahamut.com.tw/s01/201302 ... fa281d.JPG
I know this is the GM, but it should be the same or at least very close to Gundam.
Gelgoog obviously also isn't a problem.

https://truth.bahamut.com.tw/s01/201610 ... e821a7.JPG
RX-78-2 vs the F-22, the foot surely get more contact area than the landing gears, the most of the MS aren't more than 3 times in mass of the F-22.

If we take things to the extreme, say, assuming the MS is a direct scale up of a human with the same density(most MS has less density than a human because of their physique being bulkier) the height is 10 times and the mass is 1000 times. The foot contact area should be about 100 times of a human, thus the pressure should be around 10 times(1000mass/100area) of a human.
"Most pavement PCC has a compressive strength between 20.68 and 34.47 MPa (3000 and 5000 psi) (ACPA, 2001)."
https://pavementinteractive.org/referen ... -strength/
According to wikipedia,(I am lazy and don't want to find a better source or do the calculations) taking the human walking pressure to be around 70kPA(which is sourced and linked in wikipedia's article ref [3]), you get about 700kPA for the MS, which is still lower than the standing pressure 3250kPA of the stiletto heel.(Spike heels walking can be up to 13MPa)
Post Reply