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Old 02-07-2019, 06:37 PM
John Arnold John Arnold is offline
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Join Date: Jan 2009
Posts: 3,055

Sheet aluminum has no strength must be backed up by something.
Aluminum is about 6 times as stiff as spruce along the grain, and 6 1/2 times as dense.
The challenge is weight, because a heavy top will produce less volume, but more sustain.
If you make an aluminum top the same weight as a spruce top, it will not be nearly as stiff. That is because of the cube rule.
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