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| Re: HP is not important? |
Subject: Re: HP is not important?
by Mildman on 2009/12/10 8:01:32
What breaks stuff is force, the unit of force in twisting is torque. Horsepower indicates how far up the engines rpm range that torque is made - gives you a good indications of a cars top speed, but not a accurate indication of how much drivetrain breaking force is available.
"The resulting torque fed to the differential is a multiple of the rpm at the motor." - I disagree, the torque value is not multiplied by RPM - it can be constant across the entire RPM range of a vehicle in some cars. Torque is independant of RPM
Have a think about how big diffs are in trucks, these things have very low horsepower motors with phenomenal torque figures...
Smaller scale any diesel engine really, poor HP, good torque.
In F=ma the F is torque the m is mass - so to determine how fast a car accelerates you use torque, then derive the abstract concept of horsepower.
...I think i've forgotten what my original point is... but in summary force breaks stuff and torque is a force.
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