Hi Guys, here are some results of our second attempt on the Peru CdS: - Batch size = 500gm - Preheat temp / duration = 220dC / 10mins - TO temp for roasting = 250dC - Time to first crack = 11:15. This was based on a guess from colour and the fact that the beans started smoking. Couldn't hear a thing. Similar issues with previous roast - mechanical noise from motor, contact of agitator against base of strainer, sound being damped by TO lid on silicone tube. - At 11:45, we dropped the heat to 220dC based on Lacehim's suggestion. I panicked a little and did it too early. Should've done it at 12:15. - At 12:45, the heat was increased back to 250dC. - At 14:30, (heat source and) beans were removed. As soon as the TO was taken off from the top we could hear the beans popping. Could not tell if this was from first crack or second crack (I doubt it's second crack). Cooling: - The beans were cooled using 2 strainers, pouring from one to another. We couldn't find a stand fan. Temp outside was around 12dC anyway, within minutes the beans were cooled enough to touch. Results: - The roast was lighter than what we wanted to achieve (much lighter than Ewan's). - The beans were not evenly roasted as well. Had to pick out some 20 beans which had the colour similar to a peanut. Considerations for the next roast (one or a combination of the following list): a) Preheat to 250dC (instead of 220dC); b) Don't drop the heat at all or drop the heat slightly later (perhaps around 12:15 or 12:30); c) Pull only later, at about 15:00 or 15:30. d) Other mods to TO to provide: - i) A better agitation (spring mod / increase of motor speed) - ii) False floor for a smaller roasting chamber - iii) Temperature sensors Any comments would be much appreciated.
