Tractor Drawbar Pull from Power
The inverse of the drawbar-power tile: the drawbar pull a tractor develops at a working speed for a given power, pull = 375 x drawbar_hp / speed (a PTO rating converts first with drawbar_hp = pto_hp x tractive efficiency). A 75 PTO-hp tractor at 4.5 mph on firm soil (efficiency 0.72) pulls about 4,500 lb; on sand (0.50) only 3,125 lb, because slip wastes power. Answers 'how much can it pull' instead of the power from a measured pull. Traction can limit the usable pull below this; ballast and tires govern.
Formula and source
pull_lb = 375 × drawbar_hp / speed_mph; a PTO rating converts first with drawbar_hp = pto_hp × tractive_efficiency. The inverse of drawbar_hp = (pull × speed) / 375.
ASABE D497 (Agricultural Machinery Management Data) by name; Nebraska Tractor Test Lab publications.
Audience
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Posture
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