Hi Jerry

PP refers to the US version of the calculator in post #20 above. Here's the link again http://www.biabrewer.info/viewtopic.php ... 985#p12862

Download this and open the file. On the Volumes sheet at the top in cells H1,I1 you can select either Metric units or US Imperial. If it says Metric just click on the cells and a little tab will appear click on this and a drop down menu will allow you to choose between the Metric or Imperial option

I'll Look up your recipe you posted later and see what I get.

Yeasty

Hi Jerry

What copy of the calculator are you using? If its the one in the The Master Guide of BIAB Brewing it doesn't have the facility to change units. The one I used for your recipe has the added feature.
I've included a screen dump to show the area to be looking at. Open the WW recipe or the one in the link in post #26 above and have a look.

When you change between metric and imperial the units change in column "C". You then have to change your brew length and pot diameter figures.The rest will auto fill. I think this is were your going wrong



Yeasty

Go for it Jerry it should be a cracking brew.. .

Yeasty

HI there jerry,

I think you'd need to upload your recipe in 'The Calculator' format for us to help you on the volumes side as there are a few simple errors that may have been made.

As for efficiency, this would need to have been decreased for such a high gravity brew. The default 'mash efficiency' in the calculator is 81.6%. I would lower this to say 72% for a brew with such a high gravity. (Do not use this number in BeerSmith2 as it works on an entirely different efficiency system - see the BIABrewer Beersmith2 guide for more info on this. Once you read that, you'll realise how much easier the calculator is to use .)

Here is a link to common causes of low efficiency readings. I have added this 'high gravity' problem as cause number 8 thanks to your post .

Things will be less complicated when the new calculator becomes available so hang in there

PP

Hi Jerry
Sorry to see your brew didn't go exactly to plan, but hey you still did ok. Your gravities are a bit out but 1.066 is still ok just rename it an Autumn warmer Did you record any other values such as pre boil volume and pre boil gravity ? it would be good to see these numbers as well as the ones you've already given.

Thinking about it I think one of the main problems was that we were trying to fit a HBS recipe kit into the calculator, this had a set grain bill and hop schedule for a set brew length into FV, leaving the efficiency at 83% was a mistake as per PP's wise words (me not you PP) but I think this came from the recipe supplier and the numbers seemed to add up in the calculator so we went with it.

I don't know what your plans are for your next brew (I hope you're not quitting) but I'd find another recipe I fancy, put it into the calculator, post it for review and then purchase your Grain bill and hops. This was only your second brew and it will take a while to dial in your volumes/efficiency the next one will be better again just keep at it.

Yeasty

Hi Jerry

I think the thing to do with your Bock is to input it into the calculator, set the efficiency to 72% and your OG to what you want. Then manipulate the Brewlength until the grain bill matchs that supplied in the kit. This should give you volumes you need. If you get better than 72% you'll have a higher pre boil gravity which you can reduce by adding more water either pre or post boil.

Yeasty

Edit: There's a new thread been started Here that discusses AG Kits and the calculator. One to watch..

BIAB achieves a very high mash conversion efficiency, in fact it can be 100%

The more water in the mash the more efficient.

The limiting factor is the absorbtion, the more water you absorb and the higher the gravity, the more sugars you lose

The trick is thus to have as much evaporation as you can so that you can have a higher preboil volume

Which leads to a potential higher mash volume which leads to a higher liquor to grain ratio

I've had 97% into boiler efficiency, but a more normal is about 83%

Biab is not as efficient most of the time as fly sparging but is generally more efficient than batch sparging, except for very big beers

Higher gravity (lower liquor to grain ratios) lose more extract to absorption, so it can be worthwhile to dunk sparge

A good way to increase evaporation is to boil for 90 minutes

JerryMan wrote:Hi Yeasty,
Why not just adjust the grain to achieve the correct OG at 72%? I think 2 row barley is the base grain for most brews as I recall. I would just make sure I have some on hand before my next BIAB brew session. Jerry

Hi Jerry

You can do that of course, I was thinking that all the grain you had was what came with the kit. If you have some 2 row by all means use it.

Yeasty