Original gravity

How to get most out of brewing with your Braumeister? Help others and share your tips/best practices.

Original gravity

Unread postby Maxbrewer » Tue Jan 29, 2019 8:13 am

I have a question. I’m really struggling to hit my original gravity. My pre boil gravity is never an issue. I’m normally within a couple of points. I even boiled for 90 minutes and still can’t hit my original gravity. I’m hoping someone might have some advice.
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Re: Original gravity

Unread postby Cristian » Tue Jan 29, 2019 10:18 am

Depending on your software, check the evaporation rate.
OG is dependent on this parameter. You may not have vigorous boil so the evaporation rate is lower than what is inserted in the brewing software. This way you will lose less water than planned and have lower OG vs planned.
Are you using a dome? This helps the boil a lot
note down your preboil volume, your final volume before chilling and insert this number (Preboil volume - final volume) in the evaporation rate section.
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Re: Original gravity

Unread postby Maxbrewer » Tue Jan 29, 2019 10:42 am

I’m using BeerSmith and I get a great rolling boil with the hood. I did an experiment with water, measuring volumes before and after and I only lost just over a litre
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Re: Original gravity

Unread postby Cristian » Tue Jan 29, 2019 10:51 am

approx 1L in 60 minutes is very low. not sure why. maybe somebody else expericence this
did you check in BeerSmith the "Boil off" parameter? is it correct?
Last edited by Cristian on Tue Jan 29, 2019 10:55 am, edited 1 time in total.
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Re: Original gravity

Unread postby Maxbrewer » Tue Jan 29, 2019 10:54 am

In BeerSmith you only have the option of plugging in an hourly boil off rate.
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Re: Original gravity

Unread postby Cristian » Tue Jan 29, 2019 10:57 am

and what is this number in your case?
this number should be the same with what you tested (better test with wort than water as it may differ slightly)
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Re: Original gravity

Unread postby Maxbrewer » Tue Jan 29, 2019 11:00 am

BeerSmith is telling me 1.89 litres per hour
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Re: Original gravity

Unread postby Maxbrewer » Tue Jan 29, 2019 11:04 am

With the recipe in question BeerSmith estimated 1.071 and I got 1.060
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Re: Original gravity

Unread postby Cristian » Tue Jan 29, 2019 11:50 am

In my opinion you should check again your profile. Your BM 20 profile in BeerSmith may differ a lot to another user using the same equipment. This is due to temperature, altitude, local ingredients, skills etc
BeersSmith and any other brewing software will use standard or average parameters for boil off, chiller loss and other. It is important to adjust the software according to your own numbers. (boil off, grain and hop absorption)
Brew 2 times the same recipe and measure all during first batch. Update you profile and brew the recipe again. you should be “calibrated” afterwards.
You may also try using more BM friendly software like Brewfather of Brewers Friend.
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Re: Original gravity

Unread postby f00b4r » Tue Jan 29, 2019 9:06 pm

Also make sure you give a really good stir before taking your pre boil and post boil gravity readings otherwise they can sometimes be misleading.
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Re: Original gravity

Unread postby Maxbrewer » Tue Jan 29, 2019 11:20 pm

I plugged the same recipe into brew father using the braumeister equipment profile and instead of suggesting 25 litres as the strike volume from BeerSmith, brew father suggested just over 23. I wonder how much 2 litres would change the OG
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Re: Original gravity

Unread postby johnrm » Wed Jan 30, 2019 12:10 am

You could be out by 8%.
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Re: Original gravity

Unread postby Maxbrewer » Wed Jan 30, 2019 12:17 am

I wonder who’s right then when it comes to calculating strike volume, BeerSmith or brew father
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Re: Original gravity

Unread postby IPA » Wed Jan 30, 2019 8:57 am

Maxbrewer wrote:I wonder who’s right then when it comes to calculating strike volume, BeerSmith or brew father


Are you achieving the correct final volume at the wrong,lower, gravity or are you ending up with a larger volume at a lower gravity?
For the record I have never used brewing programme and always end up spot on.
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Re: Original gravity

Unread postby Cristian » Wed Jan 30, 2019 1:46 pm

I doubt you matched the profile in BS with the one in Brew father 1:1. (you have much more options in BS as its specialized for 3v systems). So it’s normal to have 2 different results.
Why do you bother with strike water volumes? Ad 25L +sparge or mash full volume (30L) and adjust grains and hops to your desired OG/FG/IBU


Maxbrewer wrote:I wonder who’s right then when it comes to calculating strike volume, BeerSmith or brew father
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