Author Topic: Erlenmeyer flask alternatives  (Read 3249 times)

Offline zorch

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Re: Erlenmeyer flask alternatives
« Reply #15 on: March 30, 2011, 01:05:48 PM »
  I put some water in it last night and it works but the stir bar looses it place at higher speeds.  I'm just gonna order a flask. 

I have a 2L and a 5L flask, and both of these will throw the stir bar if I get the speed up high enough.    It's important to remember that a high spin rate is totally unnecessary.   Barely turning around is actually fine.  All you are trying to do is keep the liquid circulating.


Offline glastctbrew

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Re: Erlenmeyer flask alternatives
« Reply #16 on: March 30, 2011, 01:36:28 PM »
  I put some water in it last night and it works but the stir bar looses it place at higher speeds.  I'm just gonna order a flask. 

I have a 2L and a 5L flask, and both of these will throw the stir bar if I get the speed up high enough.    It's important to remember that a high spin rate is totally unnecessary.   Barely turning around is actually fine.  All you are trying to do is keep the liquid circulating.



I thought the goal was to get a vortex started, not a top to bottom one, but one that is at least an inch deep or so.  Does a much lower rate of mixing create enough turnover to really boost the oxygen transfer to the starter wort?
Scott
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Offline denny

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Re: Erlenmeyer flask alternatives
« Reply #17 on: March 30, 2011, 02:58:54 PM »
I thought the goal was to get a vortex started, not a top to bottom one, but one that is at least an inch deep or so.  Does a much lower rate of mixing create enough turnover to really boost the oxygen transfer to the starter wort?

Based on my experience, that's plenty.  I get a vortex maybe 1/4-1/2 in. deep and get great yeast growth.
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Offline narcout

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Re: Erlenmeyer flask alternatives
« Reply #18 on: April 02, 2011, 08:51:43 AM »
I was thinking I could just use my 1 gal jugs but they are not flat enough on the bottom.

Maybe it depends on the type of stir plate and/or stir bar that you use, but I use a one gallon glass jug on my stirplate no problem.

Offline denny

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Re: Erlenmeyer flask alternatives
« Reply #19 on: April 02, 2011, 09:39:39 AM »
I was thinking I could just use my 1 gal jugs but they are not flat enough on the bottom.

Maybe it depends on the type of stir plate and/or stir bar that you use, but I use a one gallon glass jug on my stirplate no problem.
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Same here.  Although, with a previous plate and bar the same jug didn't work.  I don't know for a fact, but I think it's because the stir bar I use no is longer than the previous one.
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