The "horse power" thing got my curiosity up, did some looking around.
Found this on Wikipedia:
In 1993, R. D. Stevenson and R. J. Wassersug published correspondence in Nature summarizing measurements and calculations of peak and sustained work rates of a horse.[13] Citing measurements made at the 1926 Iowa State Fair, they reported that the peak power over a few seconds has been measured to be as high as 14.9 hp (11.1 kW)[14] and also observed that for sustained activity, a work rate of about 1 hp (0.75 kW) per horse is consistent with agricultural advice from both the 19th and 20th centuries and also consistent with a work rate of about 4 times the basal rate expended by other vertebrates for sustained activity.
That said, I would challenge any engineer to design a machine with a 1 HP motor that weighed 1200 lbs, that could accelerate, spin, buck, bite, kick, run, and stop as fast as a spooked horse! LOL
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