I heard back from my "C" today and he said my device wouldn't work because my can was to short. He said it needed to be 200 mm in length and tuned to 60 hz. In previously, I was told 150 mm so go with the 200 mm figure and not the 150 mm. Now I have to remake my lower can.
I think the 150 mm length may be for the 50 hz European sonic boiler. The 150 mm measurement was the original measurement we were given, and at that time we were talking only about the European version. So, we need to make that change on our diagrams.
Here is a 200 mm can. If you're putting two pop cans together, you need to cut them as long as possible, because when you mate them together, you're just going to have 200 mm with nothing to spare. So, keep that in mind.
Oh, the cans fit together fairly tight but I added super glue to the seam on the outside of the can assembly to make sure everything held together right. I added it to the seam all the way around the seam.







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