Actually, horsepower is derived directly from torque. That's why on a dyno chart the HP and Torque curves cross at the exact same point every time. I can dig up a HP vs Torque article if you want, it's sort of a tricky subject and even though I've read a lot about it I don't feel like I know enough to explain it.
you got me all wrong, i just gave out the definition for the unit horsepower. i mentioned that those trap-speed calculators probably assumes that there is a 15% parasitic loss (through drivetrain) and that all the crank is hooked up to wheels at axles at 1:1 ratio.
