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HOMEBREW Digest #3032
HOMEBREW Digest #3032 Mon 17 May 1999
FORUM ON BEER, HOMEBREWING, AND RELATED ISSUES
Digest Janitor: janitor@hbd.org
Many thanks to the Observer & Eccentric Newspapers of
Livonia, Michigan for sponsoring the Homebrew Digest.
URL: http://www.oeonline.com
Contents:
RE: magnetic stirrers (LaBorde, Ronald)
Champagne caps/AHA Nationals (Kim Thomson)
O2 caps some more... ("Nathaniel P. Lansing")
Reviving lost starters(Bob Fesmire) (DGofus)
Trouble with the kraeusen that won't go away ("Phil & Jill Yates")
stir plate (John_E_Schnupp)
catales (JPullum127)
Wyeast 3068 ("Fred L. Johnson")
Yeast culture in stirring flask ("Fred L. Johnson")
More eastern sounds that are beer related, and probably nobody cares about. ("Dr. Pivo")
Primetab (Bobpreed)
Titratable Acidity/Phosphate (AJ)
Is it just me....or (Joe Rolfe)
HERMS Piping (AKGOURMET)
diacetyl mouthfeel (AJ)
Label Fixing (Brad McMahon)
Ruddles Best Bitter and Stone's Best Bitter. ("Roy E. Dawson")
Yellowing leaves (ThomasM923)
Re: Yeast culture in stirring flask (Domenick Venezia)
Re: quick weiss question ("George De Piro")
Medicine Rock Keg (JYANDERS)
2000 AHA Home Brewers' Conference (Some Guy)
bacteria (JohanNico)" <JohanNico.Aikema@akzonobel.com>
Beer is our obsession and we're late for therapy!
2000 MCAB Qualifiers: Spirit of Free Beer! Competition 5/22/99
(http://burp.org/SoFB99); Oregon Homebrew Festival 5/22/99
(http://www.mtsw.com/hotv/fest.html); Buzz-Off! Competition 6/26/99
(http://www.voicenet.com/~rpmattie/buzzoff)
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----------------------------------------------------------------------
Date: Fri, 14 May 1999 15:34:00 -0500
From: rlabor@lsumc.edu (LaBorde, Ronald)
Subject: RE: magnetic stirrers
>From: Randy Ricchi <rricchi@ccisd.k12.mi.us>
>I've been thinking of getting a magnetic stir plate and was wondering what
>length/shape stir bar I should get. Would 1" be okay? There are X shaped
>ones and straight ones. Any advantage of one over the other? Also, what
>speed should they be operated at? They seem to have variable speed from 100
>to 1000 rpm's.
Get one for sure, you will be well pleased with the results. I was lucky
enough to have an old one given to me cuz it wasn't working. A little
liquid wrench on the bearing, then some oil and sandpaper (to get the
corrosion off of everything), and I had a stirrer.
Naturally, I opened it up because I just had to get a peek at the magnet.
In fact, that is how I got it in the first place. I was asking my lab
friend what the magnet looked like, and he said "Take this old one apart and
get the magnet".
I can tell you it would be real easy to make one. This is a rather small
one with a magnet about the size and shape of a pencil piece about two
inches long. It is mounted onto a flat round disk with a cable clamp. This
in turn is mounted onto the most chickenshit small and feeble motor I have
ever seen.
Point is - the motor gets loaded down and almost stalls when you get a good
thick yeast slurry going, so I am considering building one with a much
better motor and a somewhat larger magnet that will be up to the task.
I plan to put some distance or insulation between the motor and the top
plate to prevent heating up the flask too much. As far as the magnet that
goes inside the flask, you can purchase these very cheaply, $3, $4, or so,
and they are teflon coated and sealed. They are anailable in many sizes, I
have been using one 1/4 by 2 inches round bar shaped. You could not build
one as good without a lot of trouble.
I really would like to build a huge monger to put my carboy on top of and
slowly stir the fermenter (bye bye to CO2 poisoning), and see what happens.
As far as speed, the one I have uses a resistive potentiometer to vary the
motor speed. It works, but there is no way to measure speed. One could use
the speed control and motor from a drill and have power and variable speed.
It's fun to crank the speed up, talk about foam city, you can aerate easily
with high speed, I think a speed control would be nice. I slow mine down
after a few hours of aeration, then stir fairly well for one day, then feed
again and repeat.
I say, build it; be a real homebrewer!
Ron
Ronald La Borde - Metairie, Louisiana - rlabor@lsumc.edu
------------------------------
Date: Fri, 14 May 1999 12:36:18 -0500
From: Kim Thomson <alabrew@mindspring.com>
Subject: Champagne caps/AHA Nationals
1. Zemo askes about caps for european champagne bottles.
Homebrew Shops supplied by Crosby and Baker can order 29 mm caps that
might fit and some handcappers have reversable jaws that will fit the
champagne bottles.
2. Has anyone received their results from the AHA first round in Kansas
City? A few of us here sent in entries and haven't received a reply.
Must not have been the winning beers they were in our comp.?
- --
Kim Thomson
Birmingham, AL
------------------------------
Date: Fri, 14 May 1999 22:37:18 -0400
From: "Nathaniel P. Lansing" <delbrew@compuserve.com>
Subject: O2 caps some more...
Joe Rolfe says in #3030, "...and I doubt the o2 cap is going
to pull that much air out. "
The spec from one manufacturer is 2 mL. If you left 10 mL of atmosphere
in
the headspace
they figure this is just about the volume of oxygen you need to remove.
FWIW
------------------------------
Date: Sat, 15 May 1999 07:01:57 EDT
From: DGofus@aol.com
Subject: Reviving lost starters(Bob Fesmire)
I have two starters that i have abondoned. They both have been stepped up
once. The one has been in the fridge about 1 1/2 months the other has been at
room temps for about three weeks. Are they still good? My brewing schedule
has been shot to hell. Where has the last 3 months gone? I thought about
adding thier contents to some boiled and cooled malt and seeing if i can get
any activity. I was afraid of Autolysis, but I do not think that it is a
major factor here. Any help would be appreciated. Thanks.
Bob Fesmire
Madman Brewery ( somewhat defunct, but trying to get back into it.)
Pottstown, PA
Dgofus@aol.com
------------------------------
Date: Sat, 15 May 1999 21:28:20 +1000
From: "Phil & Jill Yates" <yates@flexgate.infoflex.com.au>
Subject: Trouble with the kraeusen that won't go away
I am going to try and be a little more circumspect with what I have to
say. I don't want to upset the classroom any more than I already have and I
certainly don't want to be frog marched out the door by " the bouncer "!
Hey, I like it here. Dave and I have resolved the matter between us so it is
now something of a dead issue, at least as far as we are concerned.
On the matter of wheat beers, I have just produced two using White Labs
WLP 300 Hefeweizen yeast and I must say the fermentation performance was
something to behold. I have never seen a kraeusen that just kept going like
this one. Out the top it came and marched around the brewhouse looking for
something else to eat! On the second one I dropped the temp. back to 17 C
(sorry I'm too lazy to do the conversion back for you_ why you guys didn't
go metric years ago is beyond me), suffice to say this is about 1C below
recommended minimum and the sulking little creatures almost stopped working.
In the secondary the kraeusen reappeared and simply didn't want to go. I
guess they liked it there! I was beginning to think I was going to have to
beat it down with a mallet but eventually it saw reason and departed of its
own accord (some ten days in the secondary). I was going to contact Chris at
White Labs, not that I had a problem with the resulting beers but just to
ask if this is the norm. Sorry I can't add much more, just interested to
hear of someone experiencing something similar. If I spent less time being
such a naughty recalcitrant I might have learnt something!
One more point, save me writing another post.
Fouchey mentions his mate Fred wants to re wire his pleasure toys to 415V
for use over here. Well Eric, they usually only give us 240V in the home so
unless he wants to play with the things while hanging on to the actives
outside, tell him he's going to find them a bit dull. And whilst I've got
your attention, would you please stop sending me these silly notes about
cutting out paper dolls, you're making me laugh when I'm trying to
concentrate on my lessons!
Phil Yates.
------------------------------
Date: Sat, 15 May 1999 05:25:34 -0700
From: John_E_Schnupp@amat.com
Subject: stir plate
Here's something to consider, it is very easy to build your
own stir plate. Use a fan or motor, attach a magnet and you
are on your way. You will need to build a case for it and will
need something for speed control.
If you use a DC fan/motor, use a variable voltage DC power
supply. If you use an AC fan/motor, use a variac (variable
AC transformer). I found a dearly departed stir plate at work
and took it apart (just to see what made it stir, besides that's
my job, take broken things apart, fix the broken thing and put
it back together). It was a Corning(tm), it used an AC motor
and was controlled by a variac. The stir plate I built used
a DC fan and a recent upgrade uses a DC motor.
You can make stir bars from nails. Cut the head off the nail
seal it in some nylon/vinyl/teflon tubing. Be careful
when heating/melting the tubing to seal the nail, you don't
want it to catch on fire. Dave Burley gave me the nail
stir bar idea (and a good idea too, IMO).
You can build a stir plate yourself for almost nothing,
especially compared to the cost of a new one. Even if you
have to buy most of the stuff it will most likely be cheaper
than a commercially produced stir plate.
John Schnupp, N3CNL
Dirty Laundry Brewery
Colchester, VT
95 XLH 1200
------------------------------
Date: Sat, 15 May 1999 09:03:25 EDT
From: JPullum127@aol.com
Subject: catales
yes everyone knows cats are wonderfull, especially broiled with a little
garlic butter and accompanied by a catamount porter. sorry i just could't
resist,won't ever post anything like it again honest!
------------------------------
Date: Sat, 15 May 1999 09:11:51 -0400
From: "Fred L. Johnson" <FLJohnson@worldnet.att.net>
Subject: Wyeast 3068
Herb (Bresler?) describes the behaviour of a Weihenstephan Wheat yeast
(Wyeast 3068) ferment and asks why the mat on top isn't falling after the
ferment appears to be pretty much done:
Your discription sounds pretty typical from my own experience with this
yeast. The krauesen head on this fermentation is, indeed, impressive. I
have had a 5.2 gallon ferment crawl out of a 6.5 gallon bucket on numerous
occasions at 68 F. I think it is so vigorous that it is difficult to keep
the internal heat down. I now ferment this well below 65, but I suspect
the acual internal temp is considerably higher. I am working down in
temperature from batch to batch and have noticed that the ferments are, of
course, taking longer and longer but are becoming controllable at these
lower temperatures.
Regarding the mat of yeast that never falls. I have often racked after a
week in the primary when there is still a good head on it and a moderate
amount of activity. The activity continues for a while after racking (with
longer time required with the lower temps, of course, before the activity
gets REALLY slow.) The beer KEEPS its head in the secondary and at least
some of the yeast remain in suspension (and probably in the head) longer
than any I've ever worked with (limited experience, though). I finally
bottle it at this point even though the beer has not cleared. To
summarize,
I think that the head is SO stable that it simply holds onto the yeast
caught up in it, never really giving the yeast the opportunity to fall.
I have always bottled this beer when the activity is low (not stopped) AND
added plenty of priming sugar for HIGH carbonation--a characteristic of
wiezens. However, I wonder if the high carbonation level characteristic of
the style is historically the result of the typical behavior of this and,
perhaps, other weizen yeasts. I guess I'm wondering if bavarian weizen
brewers have historically not waited for all the fermentation to be
complete
with this style before bottling (because of the behavior of the yeast) and
as a result end up with high carbonation levels. (Any Weizen history
experts out there care to comment?)
Incidentally, you may have read the recent posts that describe how the
yeast
eventually DOES fall out after weeks in the bottle and the beer actually
becomes as clear as any other. Also, you may have read that many (or
perhaps even most) weizens in bavaria are clear.
- --
Fred L. Johnson
Apex, North Carolina
USA
------------------------------
Date: Sat, 15 May 1999 10:12:26 -0400
From: "Fred L. Johnson" <FLJohnson@worldnet.att.net>
Subject: Yeast culture in stirring flask
Domenick Venezia recently commented on stirrers for yeast culturing, etc. I
would like to ask Domenick and any others out there for some suggestion.
I am trying to improve my technique for culturing yeast starters. I have
been culturing in erlenmeyer flasks with a "long" foil cover over the mouth,
starting with relatively small volumes and stepping up to 2 liters. I have
had difficulty aerating the wort sanitarily. I have successfully used an
airstone and 45 micron filtered air from an aquarium pump in these flasks
but recently had my starter for the Big Brew '99 become sour. I am
confident that my problem is in unclean aeration and/or repeated entrance
into the flask(s).
I recently picked up like-new $450 (retail), 12"x12" hotplate/stirrer at a
flea market for 15 US dollars! (Boy, was I gloating!) I would like to
believe that I can initially aerate the culture medium by vigorous stirring
and also would like to believe that I can continue to aerate the medium (to
maximize yeast growth) by continuous gentle stirring to achieve continuous
gentle aeration. Is this reasonable? Or will the fermentation prevent
additional air from getting into the wort? Perhaps I can force air into the
flask during fermentation by putting the airstone ABOVE the medium, but I
fear that the airpump could be a source of contamination.
(Of course, with continuous aeration/yeast growth, the idea is to decant the
spent culture medium before pitching.)
- --
Fred L. Johnson
Apex, North Carolina
USA
------------------------------
Date: Sat, 15 May 1999 16:26:45 +0200
From: "Dr. Pivo" <irv@wireworks.se>
Subject: More eastern sounds that are beer related, and probably nobody cares about.
> the pinyin form is not widely used there
> as far as I know.
Actually it is the "most" used form of transcription, it's just that
"the most" used is still "not much". Even very educated people who can
"read" pinyin, have to try their way "through the tones" before they
understand what the hell is written. After all, they already have a
written language that works straight across the dialects (you should see
market places, where people with mutually non-intelligable dialects come
together... they "write" the symbols with their fingers on the palms of
their hands like crazy, and think you're pretty thick when you don't
understand that), why should they learn another one?
> Keyi geiwo yi bei pijiu ma?
xiexie ni. Bu yao y bei. Yao liang ge PIN! Dong bu dong?
> peeh tzee-oh' much like the 'eo' in Oreo
I like your "oreo" dipthong, but not your "tz". I'd put it more at "tj"
or "dj", a very explosive "j", much like the Indonesian one. The "tz"
sound is more near the "c" spelling, if I recall correctly. And
naturally, in Beijing, it never hurts to put a sort of "american"
swallowed "R" at the end.
But then again, does anyone really care?
>The "Zh" sound is very different from the "j"
You're right there. The "zh" is very "voiced", as in "Guanzhou" (or
"Canton" to Dave).
Speaking of more "cool spellings" and "sounds", did you know that in the
Greek alphabet, they don't have a "B", so that "borrowed words" with
"b"'s (like beer) are spelled "mp" instead. Try it, it almost "works".
I just love almost spitting in their faces when I ask for one.
"polykalo......mmmmmMMMMMMPPPIR!!!". Makes me almost wish I had a
stutter.
Speaking of Greek beer, they have a tonne of licensed brewed stuff
(Loewenbrau, Amstel, etc.) that all taste like "Hellas Fix" (no big
deal). But if on Cyprus ( Eng.sp?), it's well worth scooting over to
the Turkish side and loading up with "Effes". A lovely little hop "ring"
in that.
Dr. Pivo
------------------------------
Date: Sat, 15 May 1999 10:29:16 EDT
From: Bobpreed@aol.com
Subject: Primetab
I've been thinking about using the Primetab corn sugar tablets for bottle
conditioning, has anyone had any experience with Primetab, either good or bad?
Thanks.
------------------------------
Date: Sat, 15 May 1999 16:22:55 +0000
From: AJ <ajdel@mindspring.com>
Subject: Titratable Acidity/Phosphate
John Wilkinson asked about measurement of titratable acidity. The
specific question was over the end point of the titration. The smart
answer is that the end point is arbitrary - it can be any pH you like.
In titration of water for alkalinity it is acceptable (per APHA/AWWA
standards) to do this with the caveat that you note the pH you used.
This is a pretty sorry state of affairs, especially for a standards
organization and so there are other ways of approaching the problem. In
measuring titratable acidity the indicator is almost universally
phenolpthalein which is declared to change color at pH 8.4 and so that
is the pH to which one should titrate when using a meter to be
consistent. Most of the pK's for the acids being checked for in TA are
much lower than this so that there will be little error induced if one
used 8.3 or overshoots to 8.5 -- that's why you can get away with using
an indicator rather than a meter and still get a good result. Other
definitions are based on the "equivalence point" where the number of
milliequivalents of the titrant are equal to the number of the substance
being tested for. In measuring alkalinity one can compute the
equivalence pH (once the alkalinity us known or approximately known)
because the test substance in bicarbonate with known pK. In titratable
acidity one can't do this because you don't know how much tartartic, how
much succinic, how much malc.... are involved.
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
Don't get scared, I'm not going to discuss any of the phosphate issues
here any further. I have replied to Matt Brooks privately and suggested
that further discussions be carried out off line. I'll be happy to copy
anyone who is interested in staying with this thread.
I will note that a simple experiment with an equimolar phosphate buffer
(pH 6.8) to which calcium chloride solution was added gave a dense
precipitate and immediate pH drop. (Someone else posted about getting
the ppt. but no change in pH. ???). The interesting thing here is that
when the ppt. was washed and centrifuged two distinct solid phases were
seen in the tube. Thus more than one form of phosphate precipitated. One
phase was gelatinous and the other just wet powder.
- --
A. J. deLange
Numquam in dubio, saepe in errore.
------------------------------
Date: Sat, 15 May 1999 13:44:45 -0400 (EDT)
From: Joe Rolfe <onbc@shore.net>
Subject: Is it just me....or
is Jethros "reports" always unreadibly formatted....?
------------------------------
Date: Sat, 15 May 1999 17:52:56 EDT
From: AKGOURMET@aol.com
Subject: HERMS Piping
My project this past winter was building a heat-exchange RIMS and I finally
got it fired up for a 10 gallon batch last month. It's a 2-tier set up with
a 48 qt. cooler for the mash tun, a magnetic drive pump, a 1/2"x10' copper
coil in the sparge kettle and a combination of rigid 1/2" copper pipe and
1/2" high temp. flexible tubing (from Moving Brews). It's a tight fit, but
if you heat up the end of the tubing in boiling water it will slide over the
1/2" copper pipe. I use the flexible tubing between the mash tun and the
pump (~1 foot), between the pump and the sparge kettle coil (~6') and between
the coil and the return manifold (~2') in the mash tun. I decided to use
flexible tubing for 3 reasons:
1. flexibility in design. I don't know about you, but when I build
something for the first time I almost immediately start redesigning it after
the first use. About the 3rd. generation of something is when it really
starts to gel. What I found out on this run was that I should have used a 15
foot coil in the sparge tank instead of 10. It takes longer than I want to
ramp the temperature up.
2. flexibility in the joints. Especially around the pump. If the pump is
tied in with rigid pipe, I could see vibration or a couple of accidental
bumps causing a leak or a broken pump housing. It is also easier to take
apart and clean with the soft tubing.
3. you can see thru the flex. tubing and watch the liquid turn from cloudy
to clear. Not functionally necessary, but cool.
As for the pump pulling a vacuum and collapsing the hose, I don't think
that's a big concern. The tubing I have is pretty thick walled and
reinforced with kind of a fabric weave. You'd have to pull a pretty good
vacuum. I also wired my pump thru a ceiling fan dimmer switch so I can
throttle back the flow (at half speed for about an hour the motor was barely
warm to the touch). I was more worried about setting the grain bed instead
of collapsing the tubing, so I soldered in a vertical piece of pipe in the
mash tun manifold (slotted copper) so if the bed started to set, the vertical
tube would suck air causing the pump to cavitate which would warn the
operator to back off on the recirculating.
Here's a question for the collective: what's the formula for figuring the
volume of a cylinder in fluid ounces ? or to be more specific, how many
ounces of liquid are in 19 feet of 1/2" tubing?
Bill Wright
Juneau, Alaska
------------------------------
Date: Sun, 16 May 1999 01:07:29 +0000
From: AJ <ajdel@mindspring.com>
Subject: diacetyl mouthfeel
Dave Kerr asks if diacetyl could be responsible for an oily mouthfeel in
a pFramboise. Diacetyl is often described as having a "slick" mouthfeel
but I have never experienced that even with the high levels I've
experimented with. How about other people? Since high levels of
diacetyl usually come from "sarcina sickness" I've sometimes wondered if
this slickness isn't from slime from the diacetyl producing bacteria (of
which pediococcus is one) rather than the diacetyl itself.
On another note, I've now measured Budweiser (Budvar) and found its
diacetyl level to be 0.21 mg/L, just about the same as PU's (0.20 mg/L).
In the Budvar I find the diacetyl harder to taste - the beer is not,
IMO, as nutty or caramelly as PU. It's major quality seems to be sulfur.
While not as pronounced as in PU, the caramel component is,
nevertheless, present, especially as the sample warms at which time one
can smell the diacetyl though it is hardly overwhelming.
- --
A. J. deLange
Numquam in dubio, saepe in errore.
------------------------------
Date: Sun, 16 May 1999 14:46:18 +0930
From: Brad McMahon <brad@sa.apana.org.au>
Subject: Label Fixing
Brett Spivey, in his post appearing in HBD#3030
talks about using milk as a glue.
He said:
<<
Milk! Yep, good old milk. Whole, 2%,
1%, Skim, whatever. nobody knows why but it sticks
tight as a drum while dry and then floats off in a
ten minute soak of warm water
(one said he mixed 100 ppm chlorine bleach and sanitized while
de-labeling). "Don't soak the thing, just wet the back and
stick it on - works like a charm."
was the most convincing comment.
I really like the idea of this method and if it works, will go this
direction.
>>
Nobody knows why?? OK, I'm a nobody, and I know why.
Milk contains casein, which is a natural adhesive.
Caseinate glues are available on the market, used a lot
in the arts. Check the labels on some of your glues, you
may see it on there.
Brad McMahon,
An Australian who has never swung a cat by the tail.
(You grab them by the neck, snake style, so they can't
turn and bite.)
------------------------------
Date: Sun, 16 May 1999 08:57:49 -0400
From: "Roy E. Dawson" <dawsonandassociates@on.aibn.com>
Subject: Ruddles Best Bitter and Stone's Best Bitter.
I am trying to brew facsimilies of Ruddles Best Bitter, and Stone's Best
Bitter. Can anyone advise me: 1) what causes the uniqueness of their
flavour, as compared to other English bitters; 2) what types of malt,
hops, and yeast do they use.
If anyone has a recipe, it would be greatly appreciated.
Roy Dawson.
------------------------------
Date: Sun, 16 May 1999 09:58:38 EDT
From: ThomasM923@aol.com
Subject: Yellowing leaves
In HBD #3028 Paul Shick wrote:
"Last year, my bines had a bit of yellowing in the leaves, especially
in the late summer..."
Where were these leaves located? On the lower portion of the vine or all
over? Sometimes you will see the lower leaves of a plant turn yellow and even
drop off. This can be due the change in the level (intensity) of sun light
over the growing season. The lower leaves were created earlier in the season
and were adapted to a certain level of light. They cannot adapt later on to
some other light level (more or less) so the plant allows them to die back
and grows new leaves adapted to the new light level somewhere else on the
plant.
I would like to point out that I am making a generalization; I am sure there
are plenty of exceptions to the phenomenon I just pointed out. I have never
grown hops, but I don't think that they are that different from most garden
plants.
Thomas Murray
Maplewood, NJ
------------------------------
Date: Sun, 16 May 1999 07:54:58 -0700
From: Domenick Venezia <demonick@zgi.com>
Subject: Re: Yeast culture in stirring flask
On Sat, 15 May 1999, Fred L. Johnson wrote:
> I recently picked up like-new $450 (retail), 12"x12" hotplate/stirrer at a
> flea market for 15 US dollars! (Boy, was I gloating!) I would like to
> believe that I can initially aerate the culture medium by vigorous stirring
> and also would like to believe that I can continue to aerate the medium (to
> maximize yeast growth) by continuous gentle stirring to achieve continuous
> gentle aeration. Is this reasonable? Or will the fermentation prevent
> additional air from getting into the wort? Perhaps I can force air into the
> flask during fermentation by putting the airstone ABOVE the medium, but I
> fear that the airpump could be a source of contamination.
Fred,
The flask mouth covers that I have seen are inverted stainless steel cups
with pressed ridges to keep the bottom and sides of the cup from sealing
against the flask neck. Anything that mimics this function should work. A
drinking glass with foil rolls in an 'X' to keep the glass from sealing
the flask mouth come immediately to mind. The farther down the neck the
cover extends the better. You want free atmospheric diffusion up and into
the flask but not violent enough airflow to carry any dust or other
airborne particulates into the flask. These covers work well in a lab
with vigorous air conditioning, so it seems to me that the concept is
sound. The covers need to be sanitized just like the flask. Since
aerobic cultures are grown like this in the lab I guess it works. Seems
that when it counts O2 will be able to diffuse in. During the height of
the fermentation the diffusion gradient of O2 may be offset by the
physical exit of CO2, but until and after that it has to be more aerobic
than an airlocked system.
It's just my personal opinion, but I would avoid the hassle and risk of
using an airstone in a starter. Though why I feel that way about starters
and not fermenters is puzzling. I do use an airstone to initially aerate
the wort before pitching.
I actually have a first round starter flocculating now. You have got me
thinking that I might break out my stirrer and follow my own suggestions
for the first and second rounds (decant, refresh).
Also, IMHO, the larger and better aerated your starter the less need there
is for fermenter aeration. O2 is used to build cell walls (ergosterol)
and cell walls only get "diluted" by reproduction, so if you pitch enough
yeast to obviate the need for reproduction, then fermenter aeration
becomes irrelevant. It's an idea (huge starter, no aeration of main
wort) that I have been too timid to try. Perhaps next batch. Since I
don't brew all that often, spending 2-3 weeks building a huge starter
wouldn't be that much of a hassle.
Cheers!
Domenick Venezia
Venezia & Company, LLC
Maker of PrimeTab
(206) 782-1152 phone
(206) 782-6766 fax orders
demonick at zgi dot com
------------------------------
Date: Sun, 16 May 99 11:20:37 PDT
From: "George De Piro" <gdepiro@fcc.net>
Subject: Re: quick weiss question
Hi all,
Mark asks both the digest and me (in private) about Kraeusening
Weizenbier.
I have never Kraeusened a Weizen with a lager yeast. I never saw the
point
because I don't filter out the Weizen strain. The only problem might be
that
you would get some excessive H2S in the beer (since lager yeasts are good
at making this). It is also difficult to control the carbonation level
because
unless you can precisely measure the gravity of the Kraeusenbier at the
time of addition, and know its final gravity, you won't know
how much to add. This can be done, of course, if you have a good
hydrometer and the knowledge of the wort's fermentability. Doing
all of this in a sanitary manner is a bit tricky, but again, it can be
done.
Make up more Kraeusen wort than you expect you'll need in case
the wort is more fermented than desirable when you get around to
adding it to the main batch.
Many German breweries simply feed the young Weizenbier fresh wort
("Speisse"). This is what I usually do, and it works great. Keep in mind
that if you prime or Kraeusen with a wort other than a Weizen wort, you
will be altering the percentage of wheat in the final beer.
Have fun!
George de Piro (all over eastern NY state...)
Head Brewer at The Albany Pump Station
Malted Barley Appreciation Society
"Brooklyn's Best Homebrew Club"
http://hbd.org/mbas
------------------------------
Date: Sun, 16 May 1999 21:40:08 EDT
From: JYANDERS@aol.com
Subject: Medicine Rock Keg
I am thinking about purchasing a 2.5 gallon Medicine Rock Keg. Before I do
though, I would like to ask the group if anyone has had any experience with
this devise.
JMA
------------------------------
Date: Sun, 16 May 1999 21:50:48 -0400 (EDT)
From: Some Guy <pbabcock@hbd.org>
Subject: 2000 AHA Home Brewers' Conference
Greetings, Beerlings! Take me to your lager...
How many out there, like Mike, don't believe I really exist? That,
perhaps, I'm just a cyber personality that lives only in the imagination
of some server? Here's your chance to prove, once and for all that "Yes,
Virginia: there IS a Pat Babcock!" How 'bout the 200 AHA conference in the
Detroit area? No way I could avoid it, then. Suggest it to Brian and
Paul...
See ya!
Pat Babcock in SE Michigan pbabcock@oeonline.com
Home Brew Digest Janitor janitor@hbd.org
HBD Web Site http://hbd.org
The Home Brew Page http://oeonline.com/~pbabcock/brew.html
"Just a cyber-shadow of his former brewing self..."
------------------------------
Date: Mon, 17 May 1999 06:59:50 +0200
From: "Aikema, J.N. (JohanNico)" <JohanNico.Aikema@akzonobel.com>
Subject: bacteria
Hi,
A question for the microbiologists amongst us. I checked a starter
yeast
sample for a member of our homebrewingclub yesterday with my
microscope.
The sample was from a British commercial brewery.
Next to a few yeastcells, I found VERY lively lactobacilli like rods (I
think a little smaller than lactic acid bacteria). Probably with
whip-tail
~ (I don't know the right translation).
Is there anybody who can give me a suggestion about the type?
I'm looking for pictures of yeast cells and bacteria on the web. Any
suggestions?
Greetings from Holland, Hans Aikema
http://www.cybercomm.nl/~aikema/
------------------------------
End of HOMEBREW Digest #3032, 05/17/99
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