I have 2 small tubes I am expermenting with right now.

One is 7/16" dia x 5-19/32" length x .028 wall.

The other is 5/16" dia x 8-11/16" length x .028 wall.

They both weigh 27.5 grams.

Interestingly, when you hit them like tuning forks, the larger dia. tube is higher pitched.

I am looking at using a vibration analyser to find the critical resonant frequencies of each and shorten the smaller diameter tube to match resonance.

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