Indeed it does, which is why two vehicle parameters are CdA x
Frontal area and Rolling Resistance.  If you know the mass, speed
and these two, you can calculate the power to overcome rolling
resistance and aerodynamic drag.  This is something I have never
seen on any other accelerometer based performance meter.

Martin

> Hi Martin,
>
> On your page, you say that the AC22 can measure power at the wheels. How
> can it do that by just measuring acceleration? I could see how it could get
> initial power, but once you are going at any non-negligible speed, won't
> some of the wheel torque will go into counteracting drag and fail to
> contribute to the acceleration?
>
> Sean
>
> At 02:39 PM 10/19/00 +0100, you wrote:
> >I have used them to measure vehicle performance, have a look at
> >the performance meter at www.ac22.com  What sort of resolution
> >are you looking for?  If you set the filter capacitors to give a slow
> >enough response you should be able to resolve to 5mg.
> >
> >Martin
>
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