# What is the mass of an AT-TE?

The Wookieepedia Page about the AT-TE does apparently not contain info on its mass/weight (presuming a gravity like on Earth).

Is a canonical source on this available? If yes: Which?, if no: How much would the mass of (something like) an AT-TE propably be (approximately)?

• Strictly speaking it depends which world it's on at the time! Aug 20, 2014 at 14:29
• It weighs less than 12 parsecs.
– user8719
Aug 20, 2014 at 15:14
• @Liath actually the mass would not change depending on the planet, that is the nice thing about mass. 1 cc of water will still have a mass of 1g but the weight of it will change depending on the current planet. Aug 20, 2014 at 23:46
• Joke. Head. Over. Aug 21, 2014 at 0:44
• @SSumner Nothing goes over my head. My reflexes are too fast, I would catch it. Aug 21, 2014 at 14:10

For vehicles an important consideration is its ground pressure, how much force per area (psi or kPa) is being exerted on the ground. The ground can only support so much before the vehicle sinks into the mud. If we can calculate the area of the AT-TE's feet, this can be used to establish an upper limit on the vehicle's mass.

Ground pressure is weight over area. Normally this would be a problem for a space-fairing army as different planets would have different gravities producing different weights (and thus ground pressures) for the same vehicle. A vehicle that worked on the Moon would sink into the ground on the Earth. Fortunately for us, most inhabited bodies in Star Wars have Earth-like gravity. If there's evidence of the AT-TE performing well on high gravity worlds, the mass estimate would be lower.

The AT-TE's feet are a problem. Tracks greatly reduce ground pressure by having a large area relative to the size of the vehicle. An M1 tank has half the ground pressure of a family car despite being 40 times the mass. The AT-TE doesn't have tracks, it has feet. More area than wheels, not as much as tracks.

To make matters worse, the M1A1's ground pressure is fairly constant whether it's moving or standing still. The AT-TE walks (inefficiently) by moving three feet off the ground at a time. All its weight must be supported by its remaining three feet halving its ground area.

What's the area of those feet? Wooykipedia states an AT-TE is 13.2 meters long. To figure this out I scaled up a picture of an AT-TE so that the vehicle is 13 cm long giving a 1 cm = 1 m measurement. I then measured the feet to be 1.5 cm wide giving a diameter of 1.5 meters and a radius of 0.75 meters. I will assume they are circular. Area of a circle is `pi * radius * radius` which gives us `3.14 * 0.75 m * 0.75 m` and an area of 1.75 sq meters.

Each foot also has four duckbills to increase their effective area. They're a bit harder to measure because of the perspective, I will approximate them as a 0.5m x 0.25m rectangular area giving 0.125 sq meters per duckbill.

So each foot, plus four duckbills, has an approximate area of 2.25 sq meters. Three feet on the ground while walking us 6.75 sq meters of ground area while walking.

I'll use the simple formula for static ground pressure, weight / area. When walking the AT-TE would exert even more. An M1A1 tank has a ground pressure of 103 kPa, excellent off-road performance and a top speed comparable to the AT-TE's 60 kph. 103 kPa is 10,300 kg per sq meter. With 6.75 sq meters to work with we get about 70 metric tons or a bit more than an M1A1 tank.

An adult horse exerts 170 kPa. While this might seem a better analogy to an AT-TE than a tank, they both have legs, a horse and an AT-TE move very differently. But why not, let's use a horse as our upper bound. 170 kPa is about 17,000 kg per sq meter. Since we have 6.75 sq meters to work with, we get an upper bound weight for the AT-TE of 114,750 kg or about 114 metric tons.

Let's run Null's "scaled up M1A1" estimate through the formula. 284,489 kg / 6.75 sq meters is about 42,000 kg per sq meter or 420 kPa. This is roughly the ground pressure for a bicycle which have awful off road performance (ever ride a bike on a beach?). We can state with confidence this estimate is too high. For its volume, the AT-TE must be lighter than a modern tank.

I would say an AT-TE weighs at most 110 metric tons and probably 70 metric tons given its demonstrated off road performance.

PS Somebody check my math. :)

I'm not aware of a canonical source for the mass, but you can calculate an approximation.

One way would be to look up the dimensions and mass of a modern tank (such as the M1A1 Abrams) and scale it up to the size of the AT-TE. The M1A1 has dimensions 7.93 x 3.66 x 2.44 (not including the gun, which increases the length) for a total volume of 70.82 m^3 and weighs 63 tons. On Earth a ton equals 907.18474 kg so its mass is 57,152 kg.

Using the dimensions provided on the AT-TE's Wookieepedia page as 13.2 x 5.32 x 5.02 meters, its volume is 352.52 m^3, which is 4.98 times the volume of the M1A1. Assuming the M1A1 and AT-TE have comparable average density, the AT-TE's mass is 4.98 times the mass of the M1A1, or 284,489 kg.

• This brings it into the range of a fully loaded Haul Truck - en.wikipedia.org/wiki/Haul_truck. This seems like a reasonable estimation - much higher, and it wouldn't be effective for combat operations - it would simply claw up the environment and not be able to move. Aug 21, 2014 at 16:22
• I see a lot of unfounded assumptions here. The M1A1 is designed to protect soldiers from vastly different weapons than the AT-TE. Aug 21, 2014 at 16:43
• How do you know the humanoid's physical size in Star Wars is similar to (real) Humans? Maybe they're all a micro meter of our SI-unit meters (note that it is nowhere stated that an Imperial Standard Meter corresponds to a real-world meter). Consequently, we cannot approximate the weight of the tanks, nor can we infer the gravity constants of the planets they run around on. Aug 21, 2014 at 18:51
• @bitmask - assuming the laws of physics are the same, a rocky body must be at least approx 600km diameter to form a sphere under it's own gravity. Since the planets of Star Wars are spheres and since we can see in the movies that they have horizons, that puts something of a constraint on the size range (somebody else can calculate it...)
– user8719
Aug 21, 2014 at 19:59
• @null no way. Mike will send a hit squad after me! Jan 15, 2016 at 22:41