GilaMinumBeer said:Yes. Should be a volume per hour instead of percentage per hour. And, if anyone is smart enough to integrate a RH with Surface area algorithm based on equipment profile and with selections for wind (fan) and no wind for estimated boil off that would be swell.
I was thinking the same thing too earlier this week.
One thing I was doing with Beersmith (the 1.4 trial, as I knew 2.0 was coming soon) was setting up a recipe for a lambic, and immediately it was clear that setting up the mash schedule for a turbid mash is impossible. That would be a neat feature, even if one that most people might never use. I am probably doing a 4-hour boil with the lambic, and wanted to see what kind of volumes I needed - in particular, if my kettle is large enough to hold the amount of wort necessary to produce a 5gal batch after such a long boil.
It didn't matter though, because I realized that using any mash schedule to work out the pre-boil volume. But the problem with measuring boil-off as a percentage quickly presented a serious flaw - it implies that boiling 10gal down to 5gal takes just as long as boiling a tablespoon down to 0.5tbsp, which is just absurd. I know that it's an extreme example, but if the total boil-off volume seems to be pretty accurate for your standard 60- or 90-minute boil-length and whatever batch size, then the more you change one of those variables, the further off the calculation will be from reality.
For instance, I brewed a Berliner Weisse a few months ago, and the boil volume of 15min represented a difference of 4-fold from a standard 60min boil - same as with my lambic, just in the opposite direction. The main difference is that with the Berliner Weisse, it should end up choosing TOO LOW a starting volume, but that can easily be fixed with a post-boil top-up. The 4-hour boil calculates out to over a gallon more than is actually needed, which can be fixed, I suppose, by boiling it longer, which isn't too serious since lambic only gets a bittering charge (with aged, virtually 0%AA hops at that), but that's a waste of time. Two more beers I have planned though with long boils, a Bière de Garde (3 hours) and a Saison (2 hours), with both also having very time-sensitive hop charges in addition to the bittering (30min, as well as 15 min+ 5min charges, respectively). Obviously if I were to just lengthen boil times to reach the correct volumes, they'd all become useless bittering additions.
So it's a pretty substantial flaw. Sure, more-accurate measures can be done in a manual fashion, but just about everything in Beersmith can, so that's a bit besides the point! Especially when you consider those that might not realize the ridiculousness of measuring boil-off by %.