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 Post subject: Engineering formulas
PostPosted: Thu Aug 05, 2021 5:03 pm 
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Koa
Koa

Joined: Sat Mar 09, 2019 4:50 pm
Posts: 1258
Location: Goodrich, MI
First name: Ken
Last Name: Nagy
City: Goodrich
State: MI
Focus: Build
Status: Amateur
I used the 7 pounds, 18" spacing, .25" movement to get the Stauffer belly in the right starting point. I just used, 7 pounds, 12" spacing , 1.0" movement to get a baroque in A/ukulele belly in the right starting point. The Stauffer might have been 2.5mm, I don't remember. The uke should be 1.8; it's 2 now, and moves .75" .

If the small one should be about 2.7 times less stiff, using the thickness; why does it seem to move 6 times more?

If the back on the baroque in E that is 5 thirds bigger is around 4.5 thick; how thick would the one in A be? Using the numbers from the belly, and 10.8" long ( the belly has a extension on the neck) I get 3.2" but I don't know why.

It is just a reflective back for strength, and has no bracing,and is less than a foot long, and 6 inches wide, so stiffness comes fast.

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