Physics of Caterpillar Tracks

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Every time you see one of the CATs clearing the hill at university of the snow, you probably don't see anything amazing about it. However, caterpillar tracks used on it are just ingenious and its invention is comparable to the invention of the wheel.


First vehicles powered by the steam engine started to appear in the early 1800s. Various machines started slowly replace horses. It was especially true for the jobs that required a lot of power. Transportation, of course, was the first and the most beneficial adopter. Goods could be carried across large distances with relative ease. No wonder that farmers were also eager to adopt engines. By that time most of the work was done using horses and basic tools.

Steam powered harvesters and tractors were introduced by the end of 19th century. It started to gradually replace horses. However in some regions they created new problems as well. Vehicles proved to be too heavy for soft soils and often stuck and even sunk. Experiments with various sizes of wheels didn't produce good results. Increasing size of wheels just made vehicles heavier and more difficult to operate.

Benjamin Holt of Holt Manufacturing figured that using an old trick of pouting planks before the wheel would improve cross-country ability. By doing so, it provides solid plane for better traction and lower pressure on the ground since size of the plank is larger then of the wheel.


The main advantage of the track over the wheels is that it can distribute a very large force over a large area. That means that instead of applying all the force on little area where wheels touch the ground, it applies it over the whole area of the track.

In physics terms it can be expressed as P = F / A
where P is pressure, F is force and A is area.

Less force applied to every square meter means that it's harder for the heavy vehicle to sink into the ground. Another benefit of the tracks is that large area of contact allows to have a very good traction with the ground. That is why tracks are used for mission critical jobs, including military use and high cost operations, such as excavations and space rocket movements.

Even though caterpillar tracks provide very good cross-country ability, they have its drawbacks. Because of the weight and the construction of tracks speed of the vehicle is limited in comparison to the wheeled machines.

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"Physics of Caterpillar Tracks." 20 May 2018
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The fastest tanks can only go with the speed of 60-70 mph. Also extensive use of the tracked vehicle is hard on the engine and it needs to go through frequent maintenance.
Uses of the track

The main uses include various kinds of tractors and military tanks. Since everyone knows what tank is, it would be easy to illustrate how its track works.

In any tank there is a set of road wheels, most of them are covered in rubber and resemble ones of a car. Their basic purpose is to support the weight of the vehicle, same as in any other car. Even though it is not the case on most of the modern tanks, in the early days, tracks could be removed and tank would operate as a wheeled vehicle. However rubber tires are still used since they significantly reduces wear on the tracks.

A couple of driving wheels are usually the only ones that are powered and they set the tank in motion. They have a set of spikes which go into the track and move it, much like a bicycle chain. All other wheels simply roll on the caterpillar track. Idler located exactly on the opposite side of the driving wheel, but it is not powered.


Wik, Reynold M. Benjamin Holt and Caterpillar: Tracks and Combines. Amer Society of Agricultural, 1985.

Swinford, Norm. Allis-Chalmers Construction Machinery & Industrial Equipment (Crestline). Motorbooks International, 1998.

Wikipedia. The Free Encyclopedia. Caterpillar track. 18 Mar. 2005. 20 Mar. 2005 .

Wikipedia. The Free Encyclopedia. Christie suspension. 26 Feb. 2005. 20 Mar. 2005 .

Wikipedia. The Free Encyclopedia. Benjamin Holt. 17 Jan 2005. 20 Mar. 2005 .

Harris, Tom. How M1 Tanks Work. 20 Mar. 2005 .

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