I have one, it's a drum that sits on a stand with a crank so that the compost can be easily turned if you are the amazing Hulk. it's no good unless you are planning to fill it once then just turn it occassionally. Definitely not a good place for a steady stream of kitchen waste. And even then and although it is a closed metal drum, the composting material is always too wet. Not sure if it's rain getting in or condensation but there is always too much moisture. Now the bottom is rotting out. I'll empty it when the weather improves and have already gone back to just building a pile.Could you show me a link and/or picture of the "original compost tumbler" you are referring to?
When you say you make 19bu are you saying you make 19bu of compost or dirt each week?