You have my attention
you may want to try the roasting drum with no holes first, I believe the bigger roasters are that way... maybe the difference is like burger king (flame broiled) but if you put the holes in first its hard to take them out
I am interested in your burners, I am having more fun building (or conceptualizing) roasters than roasting coffee.. (almost)
The bigger commercial roasters appear to have fins that want to dump the beans but as long as the door is closed ...
but I like your idea, you could have an open mouth, see the roast, dip a trier in ... reverse the motor and done
I just made a great cooler for my one pound bbq roaster... automobile heater fan pulling out of the bottom of a 5 gal bucket, the colander gets sucked on to the bucket when its empty
(I will try to get pics this weekend) I think you could scale up the bucket (plenum) to accommodate your roaster capacity and still get plenty of cooling power.... you may want to automate the stirring at that size though :icon_scratch:
will you support both ends of the roast drum? that is a stucking point for me