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How to get a sweeter filter roast?

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  • #16
    I suggest it you may have needed a more aggressive profile, getting into FC a little earlier and really just letting it coast from FC to get the right development time for what you're chasing in terms of flavour. Your time getting into FC may have been a little slow, but the Rate of rise seems to be a little up and down. As mentioned, the Rao style of roasting is based on that declining RoR, which can be achieved by a higher charge and and gas to start, then slowly ramping gas down and or airflow up as the roast progresses to get the desired RoR curve.

    The damper adjuster will give some airflow adjustment and without knowing the machine specifically, it would likely have a decent effect on its roasting performance. All of my roasting on drum roaster has involved variable airflow fans, so I don't have too much information on the use of dampers sorry.

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    • #17
      Thanks for the input. I'm not sure how we can get more aggressive. We did try a slightly hotter roast but got some tipping. It might be we didn't drop the temp soon enough, not sure.

      And I know it doesn't look like it but we were aiming for a steadily decreasing ROR. The ROR variability is more a product of the roasting software not being tuned properly rather than anything else.

      I was thinking of actually starting the roast with less heat and/or higher charge which would make it easier to get a decreasing ROR as the initiallly ROR would be higher. Then playing with airflow but still not sure.

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      • #18
        How to get a sweeter filter roast?

        Originally posted by MrFreddofrog View Post
        Thanks for the input. I'm not sure how we can get more aggressive. We did try a slightly hotter roast but got some tipping. It might be we didn't drop the temp soon enough, not sure.

        And I know it doesn't look like it but we were aiming for a steadily decreasing ROR. The ROR variability is more a product of the roasting software not being tuned properly rather than anything else.

        I was thinking of actually starting the roast with less heat and/or higher charge which would make it easier to get a decreasing ROR as the initiallly ROR would be higher. Then playing with airflow but still not sure.
        I just had another look at that profile and see your development time as a percentage is around 23%. So I'd say you've just gone too far and lost some of the sweetness. I agree that a declining RoR is the way to go, but for a Yirg you probably want to maintain a fair bit of heat to encourage a good, robust 1C. Make sure 1C is really rolling before turning the gas down then drop the batch pretty much right at the end of 1C. Aim for a development time of about 17-20% I reckon.
        So if you hit 1C around 8:45 and get a good 90sec 1C I'd be dropping between 10:30 and 11:00, as long as you've heard the last of 1C.

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        • #19
          Just on the software side, can you send me a screenshot of your 'device' settings and the 'extra' settings? And also the value of you sampling interval and whether you have oversampling turned on? Keen to know how you're setting the curve smoothing, cause my hunch is you're not seeing enough data of what is happening. There'll always be issues with getting curves from artisan because of the way it polls for data, but I reckon you can get some more helpful info from it.

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          • #20
            Screen settings attached. Any advice on these would be good. Sampling interval was set on 6 though I have now reduced that to 5. Seems to work better on the Behmor though I'm yet to try in on the Diedrich. Oversampling is turned on. Once upon a time I had all this set up beautifully, then I had a fatal hard drive crash and I've never been able to get it back to how it was.

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            • #21
              Originally posted by LeroyC View Post
              I just had another look at that profile and see your development time as a percentage is around 23%. So I'd say you've just gone too far and lost some of the sweetness. I agree that a declining RoR is the way to go, but for a Yirg you probably want to maintain a fair bit of heat to encourage a good, robust 1C. Make sure 1C is really rolling before turning the gas down then drop the batch pretty much right at the end of 1C. Aim for a development time of about 17-20% I reckon.
              So if you hit 1C around 8:45 and get a good 90sec 1C I'd be dropping between 10:30 and 11:00, as long as you've heard the last of 1C.
              Yeah, I normally aim for 20-21% and about 12C above FC temp which on the Behmor comes out great but I think you're right, I might need to aim even lower for the Diedrich.

              Qu, how do I get a reducing ROR if I only turn the gas down after a rolling FC? Do you mean increase air flow to drop ROR? In my original roast profile, the blue line is gas flow so you can see I am trying to drop ROR buy continually dropping the gas pressure. It may be ROR is actually dropping but the software isn't properly set up. Hopefully readeral can shed some light on it.

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