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Author Topic: Stir plate vortex  (Read 6910 times)

Offline dbarber

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Re: Stir plate vortex
« Reply #15 on: July 26, 2011, 01:19:42 pm »
Not to hijak this thread, but I have a related question.  When I first turn on my stirplate the vortex is 1/2 or so deep, but after 12 hrs there is often a layer of krausen on top. I am assuming that the stir-bar is not spinning fast enough and that allows the krausen to build up. Do others have the same experience?
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Offline dhacker

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Re: Stir plate vortex
« Reply #16 on: July 26, 2011, 02:26:48 pm »
The krausen is gonna build no matter the stir bar speed. Some yeasts will have more krausen than others . . particularly top croppers. I did twin starters of WY3787 last week and they climbed right out the top of the flasks. That's why some folks use the anti-foam additive.
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Offline blatz

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Re: Stir plate vortex
« Reply #17 on: July 26, 2011, 05:26:50 pm »
FWIW, I recently started using a starburst stir bar, which seems to create a greater vortex at lower RPMs. 
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Offline jeffy

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Re: Stir plate vortex
« Reply #18 on: July 26, 2011, 05:42:44 pm »
Quote from: blatz on July 26, 2011, 05:26:50 pm
FWIW, I recently started using a starburst stir bar, which seems to create a greater vortex at lower RPMs. 
What's a starburst stir bar and where did you get it?
I have had problems with my stir bar being thrown off even at the slowest speeds.  Do you think this would help?
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Offline dbeechum

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Re: Stir plate vortex
« Reply #19 on: July 26, 2011, 05:45:03 pm »
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Offline blatz

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Re: Stir plate vortex
« Reply #20 on: July 26, 2011, 07:02:54 pm »
yep - that's it - one of my brewing buddies gave one to me recently for my birthday.  In preparation for the IPA I brewed 1.5 weeks ago, I ran 2 flasks of 2L starter side by side and I was able to run the starburst bar at about a 1/8-1/4 turn slower than the straight hex ring bar and still got a visibly similar vortex.

I would think it may help your situation, Jeff - it does seems harder to throw.

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Offline Hokerer

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Re: Stir plate vortex
« Reply #21 on: July 27, 2011, 09:28:35 am »
Quote from: blatz on July 26, 2011, 07:02:54 pm
I would think it may help your situation, Jeff - it does seems harder to throw.

Bigger question for me, would it be quieter?  I can never seem to get my stir bars to shut up.
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Offline dhacker

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Re: Stir plate vortex
« Reply #22 on: July 27, 2011, 09:44:30 am »
In my case the generated noise has always been a result of the flask's position on the stir plate. I can move the flask slightly left or right, front or back and find a sweet spot that is quieter. However, I use the dumb bell stir bars when using a gallon jug and there seems to be no sweet spot . . they stay centered just fine, but rattle up a storm . . .
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