Post #15 made 11 years ago
by Rick
Okay, since the VAW figure is not obvious we have to do what we can to figure it out. Otherwise you will not be able to properly scale the recipe.
The only thing I can go on is what I know to be true. 16.7 IBU in this case, I know beersmith uses Tinseth. This is a great start for me. Granted, it's still a speculation, I mean how do I know Brad Smith didn't have a typo here? The best we can do is make the right assumptions, and hope more things in the recipe start to make sense once things come together.
So in investigating further, I enter 16.7 IBU into Section. D's "please set my desired IBU's to ____".
Once you do this, go straight to your desired VIF in section B. Play with this number until your hop totals are an exact match on both sides of Section D. Be sure to remove any substitutions you have on the right side, as this will interfere. Once we get the base recipe figured out, we can enter your new AA%, but for purposes of investigation it cannot be there. With that in mind, I also temporarily set the boil time to 60m, just to be working from as much information from the original recipe possible. Even though the volume we are searching for is post boil, and the extra water is boiled off by then ... boil time does have an effect on the efficiency numbers which are linked with grain totals. (do not read further until you find the proper VIF).
Yesterday, we came up with 19.7 for Sec. B's "Desired VIF". This is because I entered the hop information as 28.0g on the left side of Sec. D in the file you got from me.
Today, you have a more precise 28.4g entered there. I like this, as it's more precise. So, today ... our desired VIF ends up being 20L. At this volume 16.7 IBU's is a perfect match for the original hop bill. This is what we can work from. .4g difference in hop bill caused us to come up with .3L difference of volume. Trivial, but it is in fact more accurate than we were yesterday.
With all of these considerations made and now entered into the BIABacus, now we look to the BIABacus sec. K for what the VAW estimate is.
I get 22.2L, this is now what is entered into Sec D. for "The original recipe's VAW was:__" (now you can delete the 16.7 we used for investigation).
Boom, there we have it. Remember what I said earlier about hoping things start to make sense as you investigate?
Well, if you notice ... VIP is almost a perfect 5G. the 20L we had to stumble upon in desired VIF is 5.28G (which is close to listed "batch size" from the original recipe).
Things are starting to make sense, and we can now say ... "Dammit BS users, why do you mean something different every time you say batch size?"
That's just the world we live in, and luckily Pat has equipped us with a tool to figure stuff out.
I hope this makes sense. The procedure of investigating is not always the same, and not every recipe will be able to be entered into the BIABacus with confidence. You just work with what is most likely, and toy around a bit until things make enough sense!
I'll attach my file, which is going to be the final result of my investigation. At this point the file needs to be suited to your needs. With that 22.2L in for "original recipe VAW", you can now scale it up and trust the numbers to be handled properly.
The boil time also should be changed to 90m, and anything else you want to do like add your hop sub back in with the new alpha %.
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