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We ran out of Harrar again, so this time I measured out 250 gr. to try
in the latest rendition of the West Bend Poppery:
1500 watts with bakelite removed and glass chimney attached with RTV
directly to the aluminum base.
The lamp chimney is 3 inches dia at base, the widest part is 4 and 1/8
inch and it is 8 and 1/4 inches high.. It necks down to 2 " near the
top, then flares out again.
The necking down near the top seems important because that seems to keep
the heat in. At least less power is required with the variac to get it
up to temperature.
Definitely would be better roasting if I did not keep changing things
all the time, but I have never had a roast that I wanted to throw out.
That being said, this many beans in a chamber this size will probably
take a couple of more roasts before I nail it. It is perhaps possible
to do 300 grams.
The blower has enough power to keep the beans moving, and vertical
circulation is good with the unit tilted about 20 degrees. This time I
had to crank the blower variac up to 140 V in the beginning.
When the roast started the beans were already up into the glass, and
there was lots of action as the roast progressed. I had to keep turning
down the blower to keep beans from blowing out and the circulation
smooth. Total time was about 15 minutes to rolling second crack, and I
shut it down at 440 F. This was not as even a roast as the previous one
which was only 200 Gr. , maybe just a few beans lighter than the rest,
not many at all. Worse looking roasts have tasted just fine.
We really do not drink all that much coffee. Just have it in the back of
my mind that I have to push the limits. Probably will get a larger
chimney and try for a bigger batch, only for the fun of it.
Oh, 250 gr. to begin with weighed 206 when finished.
Still experimenting, here in LHC.
Rich Adams wrote: