[Diy_efi] Area under torque curve?

[Derek]

To use your words - you most definitely cannot say what you just said!
In fact you just argued against yourself.

First - I said "revs" are dimensionless - not "RPM".
"RPM" has a dimension of "time^-1" - "per unit of time"

Second - you say "you multiply RPM by radius of tire and get speed"

Let's analyse that - I say - 
RPM = 1/time
Radius = distance
RPM x Radius = distance/time = speed - AGREED
Therefore Revs (not RPM) are dimensionless.

You said -
RPM = distance(radians)/time
Radius = distance
RPM x Radius = distance x distance / time
 = "area covered per unit of time" - whatever that is!
Only if radians are dimensionless do you get speed.

QED - Derek


 
> You most defineately cannot say that revs are dimensionless, if you
> spelled
> out the entire acronyms for RPM you would understand what I mean...
> Revolutions Per Minute, hence the unit is probably related to an
> angular
> velocity in terms of radians per minute (that being x*2*PI radians
> per
> minute, or x*2/60*PI radians per second).  You would then multiply
> this by
> the radius of the tire (after gearing conversion) to get the distance
> travelled in terms of meters per second...
> 
> Dimensionless... very much not
> 
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