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BT stalling when attempting longer dry times, big deal?
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Goldensncoffee
Senior Member
Goldensncoffee
Joined: 9 Feb 2014
Posts: 82
Location: Pennsylvania
Expertise: I love coffee

Grinder: Breville Smart, Skerton
Vac Pot: Chemex, Aeropress
Roaster: Mod. P1
Posted Tue Jun 10, 2014, 3:03am
Subject: BT stalling when attempting longer dry times, big deal?
 

Equipment: P1, router controller, kill-a-watt meter, fan dimmer, fluke BT probe only

I was recently attempting a 5 min dry time on SM's current Yirgacheffe Aricha. I started the pre-heated roaster at 800w. I dropped 115g of greens in. Here's what the profile looked like
3:00 283
4:00 285
5:00 285 (Ramp to 1100watts starts now)
6:00 303
7:00 325
8:00 345
9:00 364
10:00 384 (10:40 BT 394 1C)
11:00 398
12:00 407
13:00 410 Finish

I haven't tasted the coffee yet because I wanted to let it rest. How bad is a BT stall when drying? I believe I've read about stalls being really bad. Should I start at a lower wattage, say 700 and slowly ramp to 800? Any advice you all can give me is greatly appreciated.
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oldgearhead
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oldgearhead
Joined: 25 Jan 2010
Posts: 396
Location: Go Colts!
Expertise: I like coffee

Grinder: Virtuoso by Baratza
Drip: Chemex,Dilongi DCM900
Roaster: 1/2K Fluid-bed
Posted Tue Jun 10, 2014, 12:21pm
Subject: Re: BT stalling when attempting longer dry times, big deal?
 

I'll bet the coffee is great! I didn't see anything to worry it. Although 30 seconds quicker to first crack, and a 12 minute finish, might be slightly better
but I doubt it...
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Frost
Senior Member
Frost
Joined: 26 Jul 2007
Posts: 2,105
Location: Sierra
Expertise: I love coffee

Espresso: Isomac Venus
Grinder: Lelit PL53
Roaster: Poppery I w/variac, MET, BT
Posted Wed Jun 11, 2014, 1:06pm
Subject: Re: BT stalling when attempting longer dry times, big deal?
 

As long as there is enough moisture left for a healthy first crack, I guess you are ok, ...but why?  What is the benefit of spending 2 minutes at 285F?

Always keep the roast moving forward. Maybe 'old school' now; Complete the roast as fast as possible and with the least amount of heat possible.  Obvious paradox and balance required. (...maybe what's new is already old again)

Once you approach drying temps, Keep the rate of rise between 20-30F per minute until first crack. If you want to slow drying, do 20F per minute between 260-300F. AT 3 minute, 383F, You are easy to complete drying at 4 minutes.  Are the beans evenly yellowed now? Start browning without delay. Don't send all the fruit aroma up the chimney.

As first crack starts, slow rate of rise to 7-10F per minute for light to medium roast.

The Aricha is a ripe clean fruity DP coffee. If you want to show this character best, move towards a faster and lighter roast to better preserve this character. There is no 'funk' (at least not in my 10lbs) that needs to be cooked out, and there is not a problem of under-ripes either.
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Goldensncoffee
Senior Member
Goldensncoffee
Joined: 9 Feb 2014
Posts: 82
Location: Pennsylvania
Expertise: I love coffee

Grinder: Breville Smart, Skerton
Vac Pot: Chemex, Aeropress
Roaster: Mod. P1
Posted Wed Jun 11, 2014, 4:32pm
Subject: Re: BT stalling when attempting longer dry times, big deal?
 

Frost, I'm really glad you replied. You always have some great advice for me that always seems to work. The only reason I was stretching the dry time was because of what I read over at HB. I usually start my ramp to 1C at 3:00. Thats interesting that you didn't experience any funk. I can't wait to try mine. Tomorrow will be 4 days post roast. Next batch I will certainly try my normal dry time.
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Frost
Senior Member
Frost
Joined: 26 Jul 2007
Posts: 2,105
Location: Sierra
Expertise: I love coffee

Espresso: Isomac Venus
Grinder: Lelit PL53
Roaster: Poppery I w/variac, MET, BT
Posted Wed Jun 11, 2014, 8:48pm
Subject: Re: BT stalling when attempting longer dry times, big deal?
 

By all means, try everything. IMO 'slow start' profile does not go so well with high air flow as in a low flow drum.
Turnaround, rate of rise is just faster due to heat transfer with high air flow. This tends to put you already a minute ahead before drying even starts. It helps to have some humidity in the air too. I think dew point at least 40-50F helps air roasters from drying the beans too much.

Get yourself an ET probe on the Popper and it will make your profile control so much easier and predictable.
Then you can set any RoR you want and hit your finish time/temp repeatably.  The Router controller and watt meter is only indirectly connected to BT behavior.

With the Aricha my next waiting batch is 3.5/3/3.5 City+. If all is well I will next dare to do 3.5/3/3 City+.
I takes a few weeks to get dialed in this way. We have grown tired of drinking my 'experiments' so I start more conservative now and work slowly creeping towards the inside edge. (The only way to find that edge is to go too far....)  It's been a long time since I roasted a bean in less than 10 minutes.

Have fun exploring this excellent bean.
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Goldensncoffee
Senior Member
Goldensncoffee
Joined: 9 Feb 2014
Posts: 82
Location: Pennsylvania
Expertise: I love coffee

Grinder: Breville Smart, Skerton
Vac Pot: Chemex, Aeropress
Roaster: Mod. P1
Posted Thu Jun 12, 2014, 2:49am
Subject: Re: BT stalling when attempting longer dry times, big deal?
 

I will hopefully have an ET probe in this thing soon. I've been looking to hook up to Artisan to log my roasts. I think the Amprobe might be the way to go for me. I just have to save a few bucks to get one....I keep spending all my coffee budget on beans. I have 7 pounds of Aricha to play with so hopefully I can get good profile nailed before I run out of beans.
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