page_title: Tractor pulling
section_title: Drag (sled) pulling
hierarchical_section_title: Tractor pulling / Drag (sled) pulling
caption_attribution_description: A "Full Pull" marker at the Mackville Nationals tractor pull in Mackville, Wisconsin. The market indicates normally 300 feet, the distance that the class needs to reach to compete in a second round "pulloff".
context_page_description: Truck and tractor pulling, also known as power pulling, is a motorsport competition, popular in the United States, Canada, Europe, Australia, Brazil and New Zealand, which requires antique or modified tractors to pull a heavy drag along an 11-metre wide, 100-metre long track, with the winner being the tractor that pulls the drag the farthest. The sport is known as the world's most powerful motorsport, due to the multi-engined modified tractor pullers.
  All tractors in their respective classes pull a set weight in the drag. When a tractor gets to the end of the 100 metre track, this is known as a "full pull". When more than one tractor completes the course, more weight is added to the drag, and those competitors that moved past 91 metres will compete in a pull-off; the winner is the one who can pull the drag the farthest.
  The drag is known as a weight transfer drag. This means that, as it is pulled down the track, the weight is transferred from over the rear axles and towards the front of the drag. In front of the rear wheels, instead of front wheels, there is a "pan".
context_section_description: In the early days two main techniques were used. Either a dead weight of fixed mass was dragged, or the step-on method was used, where people stood at fixed positions and stepped aboard as the drag passed. Another rule which has now been dropped was that a speed limit should be observed because of injuries resulting from the increased speed at which they boarded. Today's tractors can achieve theoretical speeds over 200 km/h (125 mph).
  Today's drags (sled) use a complex system of gears to move weights up to 29,000 kilograms (65,000 lb). Upon starting, all the weights are over the drag's (sled) rear axles, to give an effective weight of the drag plus zero. As the tractor travels the course, the weights are pushed forward off the drag's axles, pushing the front of the drag (sled) into the ground, synthetically creating a gain in weight until the tractor is no longer able to overcome the force of friction. Most drags (sled) have grouser bars that act like teeth and dig into the soil to stop the sled.
caption: Full Pull marker
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