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applet-magic.com Thayer Watkins Silicon Valley & Tornado Alley USA |
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by Various Draft Animals and Humans |
Power depends upon speed as well as force. When this is taken into account the draft horse surpasses all other animal sources of motive power. It would take ten people to equal the power of one horse.
| Animal Power | ||||
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| Animal | Force Exerted (lbs.) |
Velocity (ft/sec) | Power (ft-lbs/sec) |
Standard Horsepower |
| draft horse | 120 | 3.6 | 432 | 0.864 |
| ox | 120 | 2.4 | 288 | 0.576 |
| mule | 60 | 3.6 | 216 | 0.432 |
| donkey | 30 | 3.6 | 108 | 0.216 |
| man | 18 | 2.5 | 45 | 0.090 |
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