Ron Clarke does nothing without a reason. He has some very advanced proprietary modeling tools* that allow him to actually see this expansion. Then proven in practise.
*(Based on tools that keep billions of litres of fluid in their pipes)
And with 3 tapered sections it would not work as well. The discontinuities & expansions followed by reductions act as low pass filters that keep the higher frequencies out of the mouth output. Work pioneered by Harry Olson, and refined by Tetsuo Nagaoka.
Theory is fine, but the proof is in the pudding.
dave
I'm working on the Victor (similar design), and plan to spray a expandable insulation foam in the void behind the compression chamber etc., to keep the weight down. Any reason why i shouldn't?
What would you do if you were unhappy with the granular material? Drill and try to shake out?
I'll usually install the input terminal cup at that location, or include a large enough recessed aluminum plate to permit access, and the last few grains would need a vacuum.
This large of a void space isn't something i ever dealt with in a build. Honestly i didn't even know expandable foam was considered a technique used, let alone a acceptable one. I'll infer it is since you asked about experiencing grief with it, just not a tech you've used😕
If you spray too much foam, for some reason, it turns to liquid and won't harden. So don't spray too much at once.
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