HomeRoast Digest


Topic: Hybrid vac pots (7 msgs / 138 lines)
1) From: John M. Howison
Can a Cona "D" funnel be used atop a Yama 5-cup bowl?
-- 
Contra muros, mater rubicolla
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2) From: Tom & Maria - Sweet Maria's Coffee
I have not tried but I suspect not. I don't think the diameters and 
gaskets would make a seal and i also think the Cona funnel is too 
long and would hit the bottom of the Yama bowl ...
Tom
<Snip>
-- 
-Tom
"Great coffee comes from little roasters" - Sweet Maria's Home Coffee Roasting
               Thompson & Maria -http://www.sweetmarias.com     Sweet Maria's Coffee - 1115 21st Street, Oakland, CA 94607 - USA
             phone/fax: 888 876 5917 - info_at_sweetmarias.com
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3) From: raymanowen
Vacuum brewers are designed to draw hot water up the stem into the funnel
with the Foulgers. A layer of water has to remain on the bottom of the pot,
so the glass never exceeds the boiling point of water.
If the stem is forced deeper into the pot to draw up more water, the thin
layer of water will boil away completely in a few seconds. The borosilicate
glass can withstand the soaring temperature, not the sudden inrush of cooler
coffee (~200 F coffee Vs 300+ F) on the boiled-dry glass bottom.
Some have imagined "excessive vacuum" caused the pot to shatter. News Flash-
No!
If you're not using the *exact* funnel-gasket-pot  components in the vac
pot, a GI party could be in your future.
(My last GI party was interlaced with San Miguel and involved policing
cigarette butts outside the 1st Mob maintenance shop at Clark.)
Cheers, Mabuhay -RayO, aka Opa!
-- =
Persist in old ways; expect new results - suborn Insanity...
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4) From: Doug Hoople
RayO wrote:
"Some have imagined "excessive vacuum" caused the pot to shatter. News
Flash-
No!"
There's more than one way to shatter a vacpot, Ray. Your scenario is pretty
convincing, and gives us good reason to be careful of mixing and matching
funnels and pots.
But there've been plenty of implosions with pots and funnels properly
matched, and the bulk of them appear to occur long after the "sudden inrush"
moment.
I won't speculate the exact scientific cause of these more common
implosions, as I'm not a physicist, except to say that their symptoms don't
align well with the failure mode you describe.
Doug
On Sun, Apr 4, 2010 at 3:19 PM,  wrote:
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ariascoffee.com
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5) From: John M. Howison
I haven't been attentive enough to learn jut which species of vac pots
are being hybridized.  Is anyone talking about using a Cona funnel in
a 5-cup Yama bowl?  I had understood that the Cona funnel would be too
long (or should I say tall) to fit in the Yama, but would be delighted
to learn that it would work.  My new Yama is behaving unreliably with
a Cona rod.
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6) From: Allon Stern
The problem is that, for whatever reason, the bottom of the pot cools too quickly. It draws down the coffee faster and faster. The coffee goes too fast and causes the glass to shatter.
Yes, it must be uncontrolled acceleration that is behind the shattering of these hybrids.
s.c.f.t.h.i.
-
allon
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7) From: raymanowen
" The coffee goes too fast and causes the glass to shatter."
? Don't drive too fast in coffee rain -ro
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