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The wood for the top and bottom of sound box can be found at Woodcraft or Klingspor Woodworkng shops to name 2. Ask for where they have the 'thin stock'. You will find nice pieces of 1/8" stock in many woods like Padauk, Sycamore etc. There will also be 1/4" and even 5/16" pieces but you want the 1/8" think stock. You'll see the prices are not crazy but it will cost you $20 or so for enough to make two strumsticks.
This does not show where Bernoulli actually applies. The centering force is due to the CURVED air flow around the sphere, NOT speed. Fast moving air stream does not have a lower pressure than the surrounding still air. Bernoulli applies at your mouth, because the high pressure in your lungs pushes/accelerates (increases the speed of) the air into the lower atmospheric pressure outside your lips. The pressure drop speeds up the air.
Sorry, I know this is an old post but I was wondering if you could tell me the location of the sound hole & more info on the bridge? Thanks
How to Build a Strum-Stick Musical Instrument
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