In the early days of steam/internal combustion machinery inventors and salesmen struggled to explain the difference in power output of their devices, and so the industry developed the “horsepower” unit.
It is based on the average power output of a draft horse working at a sustainable pace – not a horse’s peak, or even a human’s peak.
That means that a 1hp engine is the towing equivalent to what you’re used to reasonably expecting from the kind of lazy old horse most people had experience with.
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