>
> My 30 size press measure exactly 11,5" inside diameter per 15" height
> but 13" is about the maximum usable height because you need to add the
> wood platen to press the grape. I don't know for the 25 but you can
> probably calculate it with the same pourcentage ratio than the 30.
>

Thanks Seb. Switching to metric and using pi x r**2 x h:

3.14 * 11.5/2 in * 11.5/2 in * 13 in or:
3.14 * (14.6 cm) * (14.6 cm) * (33.02 cm) = 22.1010256 liters

which doesn't quite jive with your saying, that you get 2 x 23l
carboys with one pressing.

Incidently, if you go to google and type this directly
into the search string:

3.14 * 14.6 cm * 14.6 cm * 33.02 cm in liters

you will get the above result.

It's pretty neat for the conversions, you can do something like:

11.5 inches in cm

or:

3.14 * 14.6 cm * 14.6 cm * 33.02 cm in teaspoons

For a result of 4,483.94748 US teaspoons

Don