Subj : Re: Erg Fan Moment of Inertia
To   : rec.sport.rowing
From : A. Dumas
Date : Wed Sep 01 2021 04:32 pm

Bob <headaphid@gmail.com> wrote:
>  More to the point is your statement that a flywheel moving air is more
> complex than the relatively simple 
>  relationships I'd use to calculate the power curve from flywheel speed.
> I don't see how ergs can be
>  accurate enough for comparison purposes given all the variables like
> stoke rate, temperature, humidity,
>  air pressure etc. that influence flywheel speed. I know they measure the
> rate of slowdown of  the flywheel 
> order to compensate for the conditions but how accurate is that? 

They re-calibrate (calculate the drag factor) every stroke. See
http://eodg.atm.ox.ac.uk/user/dudhia/rowing/physics/ergometer.html#section7
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