On Fri, Apr 15, 2011 at 1:27 PM, William "Chops" Westfield wrote: > > On Apr 15, 2011, at 7:28 AM, Sean Breheny wrote: > > > (which for a 100 kg person going up a 10 meter flight of stairs in 5 > > seconds is about 2kW or Horsepower) > > An average flight of stairs is closer to 3 meters... > 10 meters of stairs in 5 seconds would be pretty impressive. > > I dunno if I'd trust a "Watts output" from an exercise machine to be > technically accurate, or even consistent between different vendors... > > A human is supposed to be "about 100W" at normal (in)activity levels. > > BillW > > Professional cyclists use power meters integral to their rear hub for training. It measure torque from the chain and speed (angular velocity.) So it's not impossible to know what the body can really put out. 2kW seems pretty high, I've never seen that number thrown around. 1kW seems likely for very short amounts of time, and many people can sustain 500W for a short time. --=20 Martin K. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .