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jaa101 t1_ja6ej8o wrote

Reply to comment by InsidiousTechnique in ELI5: Why does farming equipment require such low horsepower compared to your average car? by thetravelingsong

As plowing speed increases, draft also goes up, but usually varies as the square of ground speed. In practical terms this means that by doubling the ground speed, say from two to four miles per hour, the draft increases four times.

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InsidiousTechnique t1_ja6gtqn wrote

https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.thescipub.com/pdf/ajabssp.2010.247.255.pdf&ved=2ahUKEwjLocOc8rT9AhWXlIkEHfzuBN4QFnoECBUQAQ&usg=AOvVaw3A1t4DfoJgCQDmG8Etdlju

So I read the paper, and saw it did assert that. But here's another paper (that looks more researched) that has draft force compared to speed, and there's definitely not a squared relation there although it does show an increase on draft force compared to speed it appears more linear.

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jaa101 t1_ja6iqeq wrote

Looks like you're right, in fact it shows closer to a power of 0.33 than 1, and far from 2. Neither document goes into the physics involved.

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