Tractor Drawbar Power

Drawbar HP = (pull * speed) / 375; PTO HP estimate from public benchmark.

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Formula and source

Drawbar HP = (pull_lb × speed_mph) / 375. PTO HP estimate = drawbar_HP / tractive_efficiency (typical 0.65 firm soil / 0.55 tilled / 0.45 soft).

ASABE D497 (Agricultural Machinery Management Data) by name; Nebraska Tractor Test Lab publications.

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