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Old 10-27-2012, 02:36 AM   #1
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Default Stir plate vortex?

So I've been working all day on a computer fan stir plate. I harvested a few magnets and fans and finally got something put together that's actually spinning.

It's a very low vortex though, I'm only testing it on 400ml of water with a shelf pin as the stir bar(one of those metal bars that you use on adjustable bookcase shelving) and the vortex is only about an 3/4 to an inch deep. Is it pulling in enough oxygen to be worth while on a starter? I'm running on high @ 6.8volts. Its all my current supply puts out.

any help would be appreciated.


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Old 10-27-2012, 02:42 AM   #2
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All you have to do is turn the liquid over. Get yourself a good Teflon coated stir bar and you will be pleased with the results.


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Old 10-27-2012, 12:09 PM   #3
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Agree. A quarter-sized dimple in the top of the liquid is all you need. An actual vortex is completely overkill, and honestly I think may have negative effects on growth. That last part is speculation only, YMMV.
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Old 10-27-2012, 01:41 PM   #4
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I think you need to test it on the actual amount of liquid you are going to build your starter with because obviously the more water you have, the more work its going to take to move it around. A 1000 or 1500 ml. of liquid is a big difference than 400 ml. Also, once you have yeast in there, which increases the thickness, it slows down the swirling. Lastly, as krausen builds on top, you won't even see a vortex. The only way to know the bar is spinning, is to listen for the stir bar or to closely watch for particle movement through the glass.
The power you currently have might be enough but these other factors are going to reduce the effects you are currently seeing.
I have one of the stir plates from bigbeavk and I had to run it at 700 rpm to get good movement in a 1600 ml. starter I made last week. With 2" of krausen on top, it seemed it wasn't moving enough at lower speeds.
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Old 10-27-2012, 03:21 PM   #5
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I'll see if I can throw a different wall wort on up the voltage a bit. I have a 9 volt and 12 volt.. I have a pot on it as well.. that thing seems to take a lot of heat.. anyone heatsink there pot to help dissipate the heat??
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Old 10-27-2012, 07:03 PM   #6
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Quote:
Originally Posted by cscade View Post
Agree. A quarter-sized dimple in the top of the liquid is all you need. An actual vortex is completely overkill.
there is no reason to beat your yeast. just need enough to keep it in suspension.
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Old 10-27-2012, 11:23 PM   #7
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Okay, I got a working result. It spins two liters but hardly makes a vortex; It's maybe 12mm wide and the depth is 8-10mm. The "liquid" was highly concentrated sugar water, was trying to represent a start substance with higher SG. Will this work?

I had troubles with the pot getting extremely hot (around 120) after about 20 mins of running. So instead of having the the middle termial as the feed I wired the 1st terminal as + in the second terminal is piggy backed to 3rd terminal, third terminal is + out to fan. The fan - is wired directly to the source -. Using a 25ohm 3watt pot with a 6v source I'm getting very little variance. I'm not very happy with that, I'd like to be a wider range of speed, so I could increase the voltage up to around 9volts. Any suggestions? A different pot?
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Old 10-28-2012, 02:11 AM   #8
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Check out Mr.Malty.com, it has great info on yeast and starters.
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Old 10-28-2012, 02:18 AM   #9
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The fan is 12v 200ma if that helps with anyone sharing some insight!
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Old 10-28-2012, 04:59 AM   #10
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Problem Solved, Thanks for all the input! I broke open another hardrive and doubled up the magnet stack i was using and upped the voltage to 12 volts. I'm now pulling a vortex on 2Liters to about the stir bar! Now I just need a legit stir bar, and Erlenmeyer flask! Very excited to do my first starter on my 60min IPA clone.


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