The +-20% tension range is a pretty narrow range, it's less than a full note either way.
For 292 mm 1.8 dia...
391 hz G4 108 kgf
415.3 hz A4 flat 123 kgf
440 hz A4 137 kgf
The note is based on how fast the tension in the material can pull its inertia back and forth, but the algebra assumes a constant section. The butted spoke is thinner in the middle so it might not have pure behavior.
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Genesis 49:16-17