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Topic: Any Success with Behmor Profile 4? (comment on p2) (7 msgs / 154 lines)
1) From: Dennis Ryan
I don't want to state anything obvious, because it's all in the  
manual, but I'd like to to sorta spell it out, partly because this is  
confusing to some people, and partly because I may have gotten it  
wrong myself....
P2 states:
100% power for 60% of the time
70% power for 30% of the time
100% power for remaining 10%
If you were to start P2 with the maximum amount of time of 24:30 (to  
maximize the time before the power goes down to 70%)
so..
100% for 14.7min
70% for 7.35 min
100% for 2.45 min.
If you want to go to stage 2 (70% power) as you hit first crack you  
need to be able to get to 1st crack in 14:42 min.  of course, then  
you will finish the roast at 70%, not 100%, which is what the profile  
is trying to accomplish. --Though it might be what many of us are  
trying to accomplish.
What I usually do, is use P1, then crack the door open for 30 seconds  
or so.
Dennis
On Mar 26, 2008, at 7:27 PM, Rich wrote:
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2) From: John Brown
i am still dragging along.been real slow here for the last 4 days did 
nothing but sleep.
Dennis Ryan wrote:
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3) From: Dennis Ryan
I used a sliderule
On Mar 26, 2008, at 11:20 PM, John Brown wrote:
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4) From: Rich
You want to go to stage 2 as 1st C ends.  The beans are endothermic 
until the completion of changing the contained liquid to gas in each 
bean.  The crack is the explosive conversion of that liquid to gas and 
that requires heat to be added to the bean or the temperature will drop. 
  Some beans do not crack as the gas escapes without reaching the 
internal pressure to crack the bean.  The manual also states and I 
believe Joe has also stated this that the objective of P-2 is to 
lengthen the time interval between 1st and 2nd.  If it works for you, 
good.  I have found if you are trying to roast in 1LB batches that is is 
almost impossible to get into 1st before the power drops to 70%.  It 
might work for some coffee but I have not found it yet.
Yes, I read and do understand the manual.
Dennis Ryan wrote:
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5) From: Dennis Ryan
Rich, I have no doubt you read the manual, I wasn't implying that,  
and my apologies if I gave the wrong impression.
My contention is that P2 is not designed to get to the 2nd stage  
during or at 2nd crack. If you are using a standard P2/1#/B, the  
times per stage are 12, 6, 2, so unless one wants 8 minutes between  
the end of 1st crack and the end of the roast, P2 is not for you. The  
goals of the profiles are not in the manual, except in the most  
general sense.
Dennis
On Mar 26, 2008, at 11:51 PM, Rich wrote:
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6) From: Rich
I put the "read the manual" comment in the post for the others who might 
decide that I had not.  I realized that you are aware that I have read it.
There is a general confusion factor in the manual that may cause the non 
technical reader trouble though.  The manual suggested a set of basic 
recommended profiles that call for selecting a profile (P-1, P-2, P-3, 
P-4. or P-5), the weight of beans which sets the max default time of 
roast, and a time addition selected by A,B,C,D.  The manual dose not 
make clear that the ABCD selection is a shortcut to add time.  You can 
accomplish the same exact thing by punching + the appropriate number of 
times.  Both methods will add the time proportionally to all segments of 
the selected profile.
At the very end of the pilot beta testing period for the roaster all of 
the absolute max times for a given profile/roast weight was shortened to 
reduce the potential for a real coffee fire.  This change rendered the 
P-2 profile of minimal value as there is inadequate time to reach a 
solid 1st crack before the power level drops.
I do not know how much time was shaved off but if you are trying for a 
very dark roast it is significant.
Dennis Ryan wrote:
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7) From: Kris McN
I regularly use P2 to roast 1/2 lbs (using the 1 lbs. setting for 20 min
total) and I find that I almost always hit 1st from between 11.5-13:00 into
the roast cycle (usually 11.5-12.00).  That means that the power drop is
happening either a little ways in, or just as, 1st is starting.  This is
pretty much what I do when I use my HG/BrM - I back off the heat just a 1st
is starting.  Not so much that 1st stalls, but enough that 1st takes a
minute or two, and the time between 1st and 2nd is extended.  Then I hit
cool when I reach the roast level I'm looking for.  I'm not saying this is
the ideal profile, but it's what I do and have been doing to get the results
I like.  So, P2 works just right for me for most of the beans I roast.  I'm
sure there's variation in timing due to voltage differences between
different people's set-ups, so YMMV.
Best,
Kris McN
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