HomeRoast Digest


Topic: (Fwd) Re: +length of drying/tanning stage for different roast (31 lines)
1) From: Jim Schulman
Hi Ed,
As I said, I'm thinking the quiet time between cracks maxes out
at around 7 to 8 minute roasts on my air roaster. This is a cusp
between two competing effects. First, as the roast gets longer,
each stage of the roast gets longer (duh), so if everything
remained the same, the time between cracks would be longer too.
However, I've found on my machine that the first crack
temperature rises and the second crack temperature falls as
roasts get longer. Specifically, with a slow ramp through the
300s, the first crack starts at 400 - 410, whereas on a fast one
it starts at 370 - 380. With a very fast finish roast from about
390 up, the first snaps of the second can come as high as 455F,
if I really slow down at from there, it can come as early as
435F.
So with a very slow roast throughout, the cracks run together
again. Of course, with the low load of beans I use, they are so
attenuated at that speed, that they are hardly audible, more a
creaking than a cracking.
Jim
On 27 Oct 2003 at 9:07, Ed Needham wrote:
<Snip>


HomeRoast Digest