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Home Brew Forums > Home Brewing Beer > Fermentation & Yeast > Is my stir plate going too fast, please respond
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Old 04-03-2013, 07:53 PM   #1
jflongo
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Default Is my stir plate going too fast, please respond

I just made a 2 cup water -> 1/2 cup dme starter, pitch the yeast in my 2L flask and put it on my stir plate i just built.

Is this too fast, or ok? If it's too fast should I run it for 30 min, then turn it off, then back on again?

http://www.youtube.com/watch?v=thQor...ature=youtu.be


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Old 04-03-2013, 08:00 PM   #2
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As long as your stir bar isn't flying off and jumping all over you're fine. No need to turn it off and back on. You just want to keep the yeast in suspension.

Now that you've got a nice large flask you should look in to harvesting yeast from your starters. Build a small bank of popular yeasts and you'll never have to buy yeast again (unless it's one you don't have yet).


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Old 04-03-2013, 08:01 PM   #3
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That's not much liquid. Why so small a starter? Most starters I see are in the 1L to 2L range.

Generally, though, my understanding is that so long as you're not throwing the stir bar to the sides of the flask you're not going too fast.

But super-fast, mega-vortex movement isn't necessary. Just keeping a small divot in the surface of the starter liquid is usually enough.

Does the stir plate not have a slower speed, or a speed-control knob?

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Old 04-03-2013, 08:08 PM   #4
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My stir bar is staying in place just fine. Now as far as harvesting yeast, I do that. However, I'm doing a large worldwide beer experient with a bunch of youtube folks, and we are all using the california or american ale yeast, which I don't currently have. I will definitely harvest that after this batch.

Now as far as the size, I'm doing a 5 gallon batch, so figured I didn't need a huge starter. So I just did a 1/2L starter. This will go for about 18 - 24 hrs before it gets pitched. I always do a 1L with harvest yeast. Even going forward I may do 1L just to have a little more liquid in here.
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Old 04-03-2013, 08:10 PM   #5
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Quote:
Originally Posted by Echoloc8 View Post
Does the stir plate not have a slower speed, or a speed-control knob?

-Rich
Yes but this is at it's slowest speed. I may need to add another resistor in.
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Old 04-03-2013, 08:15 PM   #6
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Quote:
Originally Posted by jflongo View Post
My stir bar is staying in place just fine. Now as far as harvesting yeast, I do that. However, I'm doing a large worldwide beer experient with a bunch of youtube folks, and we are all using the california or american ale yeast, which I don't currently have. I will definitely harvest that after this batch.

Now as far as the size, I'm doing a 5 gallon batch, so figured I didn't need a huge starter. So I just did a 1/2L starter. This will go for about 18 - 24 hrs before it gets pitched. I always do a 1L with harvest yeast. Even going forward I may do 1L just to have a little more liquid in here.

The type of yeast harvesting I'm talking about is harvesting from your starter, not from the yeast cake left over after fermentation.

See here: http://www.homebrewtalk.com/entries/...-approach.html


I always do a 2l starter, save half a liter, and pitch 1.5l.
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Old 04-03-2013, 08:21 PM   #7
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Ahh gotcha.

Here's another quick video, I added 2 more 8 ohm resistors in, it's going a little slower now.

http://www.youtube.com/watch?v=sp5eo...ature=youtu.be
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Old 04-03-2013, 08:24 PM   #8
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That's still moving pretty quick. But once you start making bigger starters the extra liquid in there will help slow it down.
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Old 04-03-2013, 08:25 PM   #9
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Your first one was fine - aside from keeping yeast in suspension, a stirplate can also increase O2 and decrease CO2 levels through a mixture of agitation (helps knock CO2 out of solution) and introducing air bubbles into the wort (increases the area for gas exchange many-fold). As other said, unless your bar is flying off the stirplate, or spraying wort everywhere, its fine.

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Old 04-03-2013, 08:27 PM   #10
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Ok thanks all. I'll let it go over night, and then pitch it tomorrow and see how it goes. This is the first time using a stir plate, 2nd time making a starter. And like I said, next time will definitely be doing a 1L starter minimum.


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