Hello Hello!
I'd like to build a slapphone, as it's called I believe, out of PVC pipes. How do I calculate the required length for different notes? It would be best if I created an Excel spreadsheet, but how do I do that?
Thanks in advance?
LG
LurBanane
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You should be able to check the frequencies of the sounds that you can convert to the wavelength. (speed in air divided by frequency)
Normally, you would take the calculated wavelength if you had a string in front of you, for example, you would have to take off the (inner) diameter at the tube open below.
And in the end, you can also test this, you take the deepest sound you want to cut to wavelength. Then put it in the house, take it up and see what basic frequency you get. Then you gradually shorten until you arrive at wavelength diameter if there are other influencing factors.
At the last bill, what’s going on out there is that stretch in m?
Yeah.
So exemplary, Kammerton 440Hz at assumed 343.2 m/s sound speed would be 0.78m, i.e. 78cm. If I take a DN75 (i.e. 7.5cm), the pipe length would have to be 70.5 cm.
You can watch online how to do this, for example, with a panflute, which is a similar construct.
https://www.education.com/science-fair/article/design-musical-instrument-play-pitches/
Here they take Lambda/2 and add half the pipe diameter.
https://www.instructables.com/Slap-O-Fone/
This one takes Lambda.
♪
If the tubes are open at both ends, they must be 1/2 wavelength long. If the tubes are closed at the bottom, as with a marimba, they must be 1/4 wavelength long.
http://www.marimba-portal.de/aboutMarimba.html (Photo “Resonators” on the right)
https://de.wikipedia.org/wiki/Marimba
https://de.wikipedia.org/wiki/end correction_der_Resonatorlength