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Old 01-30-2007, 07:24 PM   #21
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Awesome work! I can't wait to see the SG readings!

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Old 01-30-2007, 07:27 PM   #22
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Yeah, so I was ambitious in the naming of the experiment. It'll only be definitive in my own level of acceptance of the results. To others it's probably has a slight edge over otherwise unsubstantiated rumors going around.

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Old 01-30-2007, 07:31 PM   #23
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Excellent work. Please post the final gravities when you can. It would also be interesting to know how long each takes to finish.

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Old 01-30-2007, 07:53 PM   #24
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So is it better to aerate and then pitch or pitch and then aerate?

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Old 01-30-2007, 08:04 PM   #25
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Quote:
Originally Posted by bnutting
So is it better to aerate and then pitch or pitch and then aerate?
There's likely no difference at all except aerating after pitching will likely mix the yeast in just a bit more. Net effect, nothing except maybe a ferment that starts minutes sooner?
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Old 01-30-2007, 08:43 PM   #26
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I always aerate (by shaking) first, then I take my gravity reading, then I pitch. That way I know it's well mixed and I'm getting as accurate a reading as possible. I'd hate to take a reading after pitching and lose some of the precious yeast. Also, I did shake it up a bit after pitching some dry yeast directly, and some got stuck on the sides of the carboy. That really bothered me a LOT.

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Old 01-30-2007, 10:18 PM   #27
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Quote:
Originally Posted by clayof2day
You should ALWAYS rehydrate dry yeast in boiled/cooled tap water. Rehydrating in wort, which contains high levels of sugars, sends the yeast into osmotic shock and you only recover about 30% of the viable yeast you would if you rehydrate in water before pitching.
The only thing about that is that I personally have found when pitching dry, I get a shorter lag time and my attenuation still don't suffer. I know this flys in the face of conventual(sp) wisdom but it works for me.
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Old 01-30-2007, 10:23 PM   #28
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That video was nice to watch. Which did you aerate first, #2 or #3 ?

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Old 01-30-2007, 10:54 PM   #29
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Default Some intermediate results.

To answer that last question, I pitched then aerated #2 and #3. Remember, I didn't do anything to disturb #1 except for the initial pour through the straining funnel.

Here are the SG readings (temp corrected) at 45 hours after pitching (remember the OG was 1.050):

#1 = 1.018 (64% attenuation)
#2 = 1.019 (62% attenuation)
#3 = 1.016 (68% attenuation)

Safale S-04 is claimed to attenuate in the low 70's so the O2 injected batch is nearly done. I think I'll wait until 72 hours to take the next reading. This does confirm that an oxygen rich wort, though adding somewhat to the lag time (an hour) will eventually explode into action. This is kinda like amassing a large army and attacking together rather than sending in stragglers to be slaughtered one at a time.

I'm a little surprised that #2 is the slowest. To be honest, there's a good chance they were less than a full point apart but I'm quite certain #1 was ahead by at least a noticeable margin. However, if I'm figuring correctly, #2 should catch up at some point and finish drier than #1 which should have the least attenuation at the end.

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Last edited by Bobby_M; 01-30-2007 at 11:05 PM.
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Old 01-30-2007, 11:07 PM   #30
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Well dry yeast is supposed to have the reserves built in, including o2 to start fermentation, but it is still surprising that #1 is gone further than #2

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