Author Topic: trouble with yeast calculations  (Read 4120 times)

Offline brewdiver

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trouble with yeast calculations
« on: March 05, 2012, 02:09:30 PM »
Hi ,

I'm new to beersmith and am having a problem with the yeast calculations

When I make a recipe everything looks to be good except when I add yeast then I go to the starter section and it tells me I need 91 pkgs of yeast without a starter 31 pkgs with starter.

What the heck could I be missing? this is for 10 gal batch

Offline Myk

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Re: trouble with yeast calculations
« Reply #1 on: March 05, 2012, 02:39:09 PM »
The manufacture date? If it's defaulted to a date so old the yeast would be dead it will put out numbers like that.

Offline brewdiver

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Re: trouble with yeast calculations
« Reply #2 on: March 05, 2012, 02:47:54 PM »
The yeast tab says package date 2-27-2011

last cultured date says 6-14-2003

Could one of these be it ?

Offline brewdiver

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Re: trouble with yeast calculations
« Reply #3 on: March 05, 2012, 02:53:45 PM »
Ok,

I changed the package date to 1-23-12 and it is much closer but it still says I need 7 packages with no starter and 3 pks with starter.

This is for 10 gal and still doesnt seem right ?

Offline Myk

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Re: trouble with yeast calculations
« Reply #4 on: March 05, 2012, 03:48:31 PM »
Remember, this is industry standard pitching rates not bare minimums.
Without knowing your gravity or anything it sounds right to me. It's just the way yeast grows. I'm actually amazed 3 packs in a starter without a stir plate is enough with yeast from January.

If you want to be pitching to 10 gallons of medium to high gravity and using proper pitching rates you should get a stir plate and probably a 5L flask. The growth rate differences will make it worth it.

Offline brewdiver

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Re: trouble with yeast calculations
« Reply #5 on: March 05, 2012, 04:05:17 PM »
For years I've been pitching 2 smack packs into 10 gallons for ales.  I guess this is the (minimum rate) you were talking about.

anyway I guess I will up that if these calculations seem correct

The SG. is 1.059 and the yeast is chico

I guess I will be buying a stir plate and beaker then,  thanks for the info

Offline tom_hampton

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Re: trouble with yeast calculations
« Reply #6 on: March 05, 2012, 04:52:35 PM »
www.yeastcalc.com

or

http://www.mrmalty.com/calc/calc.html

I like yeast calc because it calculates the growth for each step.  I culture my own yeasts at home, and therefore grow up from much smaller samples into my full starter. 

Stirplates can be made very easily with an old computer fan, a magnet, and a small plastic/wooden box.  I made two for about $12 total.  If you have old computer parts laying around, google "Homemade stirplate". 

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