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Topic: Turbo Beast roasting / roasting in general (3 msgs / 122 lines)
1) From: petzul
Today I did 550 Gr with my Turbo beast, and it went fine.
Got to full city + in 13 Minutes with slight profiling, and then took 
two minutes to cool to 180 with the hair drier.
Because I was net short of a pound, I roasted a 150 Gr batch right 
afterward.
With the smaller batch I could observe the differences in the roast.
It looks like we have to consider something I will call thermal inertia 
of the beans, for lack of a better description.
I preheated the roaster to 480F and dumped in the 150 Gr. The temp only 
dropped to 350, and quickly rose up to 420. In about a minute.
No first crack!
So I held the temp in the early 420's as well as I could by turning the 
thermostat on and off.
It took another good minute for the beans to get up to that temp and 
finally get into first crack.
In almost 4 minutes first crack was boiling, still holding the temp 
about the same.
At this point I started to ramp up slowly, and at 445 roaster temp I 
held back again, and waited for the beans to catch up.
It took another 30 seconds before they started to crack in second.
The batch was finished roasting in about 7 minutes, and it took less 
than a minute to cool it to less than 170F. Was not paying attention to 
the cooling, but dodging chaff ;-) .
Another very even batch, matched the first, larger batch, perfectly in 
color!
So, with the same power, it takes longer to cook more beans :-) .
Not sure how all this applies.
PeterZ
Still leaning to roast after more than a year, here in LHC.

2) From: Lowe, David
About what I would expect with that setup, more beans require more
energy (heat) to roast. It would have been good to keep a part of each
batch separate for comparison. I would expect that, even if they are
roasted to the same level, you would find them to be different due to
the different profile. If you want a given profile (temp vs. time)
you're going to have to back off on the CO temperatures.
Dave Lowe

3) From: petzul
What you say makes sense David. I have been trying to end up with a net 
one pound batch.
This time I almost made it by using 550 Gr.
It is no problem to do 1000 Gr, and I guess I should do that, then I can 
have some left over for my own use. It's just that roasting a kilogram 
at a time sure uses the stash quick!!
Not to worry with this bean. Tom has no more Nicaraguan except decaf :-( .
 From now on, I am going to roast and taste quickly when the order comes 
in, and then order 20 lbs if I like it that well.
I really hate it when I just love a coffee, and Tom is out when I go 
back to order more!
Right now I am enjoying a fresh cup of this roast: Nicaragua Matagalpa 
Margogype '04, which was part of the 150 gr batch. Rich chocolate smoky 
taste. Very full and smooth.  If the previous 550 comes out as good 
there will be no problem. The rest has gone to my favorite customer, who 
loves my dark roast much more than she ever did Gevalia. :-)
PeterZ
Enjoying Harrar Horse, every morning, here in LHC.
Lowe, David wrote:
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