The farther the tractor pulls the sled, the more difficult it becomes to do so. The weight box can impose up to 36, pounds of additional drag on a tractor, which is more than most can handle before completing a full pull.
Those tractors that do not make a full pull still have their distance recorded, though. A small wheel D makes contact with the sled's tires and tracks the precise distance between the starting line and the point at which the tractor can no longer move forward.
Once the tractor stops, it and the sled are disconnected and an operator E brings the sled back to the starting line. The Superstock class is the most highly tuned of the tractor pulling stock classes. Based on a stock tractor, the machines can use up to 3 turbo pressure stages. The Superstock class again competes at 3. The smallest of the modified classes, and formally called the Mini Modified class, this tractor pulling class is a single engine machine weighing in at just kg complete with driver.
This class is competed at 2. ETPC limitations are set to limit which engine combinations can be used to obtain a fair horsepower limit for each weight class. The 4. Horsepowers over are not uncommon. The engine size of this class is limited depending on the type of cylinder heads fitted. This provides a class where the competition is very close.
That means that the technics ar pushed to the limit. It is this aspect that keeps both public and participants under the spell of tractorpulling. After all no ready-made machines from the factory are participants to join the track, but self-built machines.
Machines where many hours of work and tens of thousands of euros have been put into materials and components. What to think about diesel engines that deliver more than ten times their standard power, or gasoline engines, delivering over 1, hp blowers and use methanol injection. In addition, nowadays most tractors make the most use of aluminum V8 racing, or V12 aircraft engines, turbine engines are even used! Classes Participating tractors are grouped into different classes where they have to meet certain requirements in order to obtain fair competition: - Standard and vintage; These are natural plain vintage tractors which must have a minimum age of 30 years.
In this division, garden lawn mowers are given supercharged V8 engines and go roaring down the track. In , the National Tractor Pullers Association was established to standardize the rules and various classes. They also began worrying about safety rules. Spectators were moved back and concrete barriers were put up. Drivers were required to wear helmets and, later, fireproof suits.
Kill switches were added to the tractors and a neutral light was added to show when the tractor was actually out of gear and safe to hook up to the sled. Sled operators were given seat belts and a safer position on top. Scatter shields on flywheels, wheelie bars and a second draw bar help add to the margin of safety. A sport that started with 50 horsepower machines driven by farmers directly from their fields to the pull off has now become big business with Super Stock Open class machines putting out over 5, horsepower.
Thousands more flock to watch the events in person.
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