"Ray" > wrote:
<Snip!>
> The calculation I use is that published by Duncan and Acton in Progressive
> Winemaking.
> PA = (G begining - G ending) / F
> Where
> G = 1000 * (SG - 1) = gravity
> and
> F = 7.75 - 3*(G begining - 7) / 800
<Snip!>

Hello Ray, et al.,

I ran my numbers for a Chardonnay in long-term aging to see what PA
the formula above reports. I must be doing something wrong because
the answer I'm getting is an impossible PA. Can someone run-through
how they're determining the answer based on my SG? Either the formula
is wrong or I'm wrong. Considering what I do for a living, I lean on
the latter; I'm NOT a mathematician! Rather, I was a Liberal Arts
major. :-)

Beginning SG: 1.098
Ending SG: .998

The final alcohol rating I calculated with a hydrometer after
fermentation completed was 13.75%.

Much appreciated, gentleman!

-Paul