Track days at Mission Raceway Park

Believe it or not, you've just proved my point. Where do you think 1/5252 comes from?

In metric: P=T*w where T is torque in Nm, w is frequency in radians per second and P is power in watts.

1/5252 is to the ratio to convert it so the variables can be in imperial. Imagine needing to remember an extra constant for each calculation, that's no fun.

Cheese wrote: Believe it or not, you've just proved my point. Where do you think 1/5252 comes from? In metric: P=T*w where T is torque in Nm, w is frequency in radians per second and P is power in watts. 1/5252 is to the ratio to convert it so the variables can be in imperial. Imagine needing to remember an extra constant for each calculation, that's no fun.

...No it's not.

The 1/5252 is simply an abbreviation of the angular speed. Yes, it does take in to account the torque's distance (The "foot" part of "pounds-foot") but that's always a static measurement. Something else to consider is that Imperial and Metric are just as complex - one couldn't be more complex for the other for the calculation to make sense.

Ibs-ft = How many pounds of force are being applied in a foot of work.

Nm = How many Newtons of force are being applied in a metre of work.

 

It should also be noted, that technically speaking, when dealing with metric, you don't have the nice easy "Torque X RPM / 5252" formula. If you follow metric to the most stringent of definitions, you'll find they calculate in radians per second. Good luck getting that off your tach.

Romeo wrote: ...No it's not. The 1/5252 is simply an abbreviation of the angular speed. Yes, it does take in to account the torque's distance (The "foot" part of "pounds-foot") but that's always a static measurement. Something else to consider is that Imperial and Metric are just as complex - one couldn't be more complex for the other for the calculation to make sense. Ibs-ft = How many pounds of force are being applied in a foot of work. Nm = How many Newtons of force are being applied in a metre of work.   It should also be noted, that technically speaking, when dealing with metric, you don't have the nice easy "Torque X RPM / 5252" formula. If you follow metric to the most stringent of definitions, you'll find they calculate in radians per second. Good luck getting that off your tach.

Yes it is, I even worked it out to verify. I got 0.000189 putting in some rough conversion factors and putting them all on one side. Compare that to 1/5252 = 0.0001904. You can call it "an abbreviation of the angular speed" if you want, but it's there because of the issues with imperial.

Metric was designed to make calculations simpler. Units are defined in terms of other units, rather than on an arbitrary measurement, ie. watts = newtons x meters compared to horse power which is some arbitrary unit so people could roughly compare the power output to that of a horse. Because of this, yes, sometimes it's awkward to measure with, but that's no reason to hate it.