I think that the term "rocket" can be, and has been, applied somewhat loosely. If you squint your eyes and cross your fingers, you might see it as a type of batch-box and bell. He doesn't give a good view of the chimney placement (and my eyes were squinted), so I can't be sure about the bell part. It may well improve emissions, but it looks like it would probably eat
wood pretty fast for what it purports to do. Well, he touches all the right bases,
cob, rocket, reflecting surface, smokeless. He ought to
sell a lot of tickets to his workshops and his hardware looks pretty good.