Here you will find all the dimensions and measurements to make PVC overtone flutes in every tone.
The examples in the video are balanced tones to equally access to low and high notes.
This balance depends on the ratio between diameter, length and shape of the window and bevel.
If the flute is short compared to the diameter, it favors the fundamental and has difficulty accessing harmonics. If the flute is long compared to the diameter, it favors more high notes but the bass will sound more muffled, and maybe not at all.
PVC FLUTES 16 mm
All lengths are measured between the bottom of the bevel and the end of the flute (the vibrating length of the air column). All measurements are in mm. The model of the video is in A, 370 mm.
PVC FLUTES 20 mm
For the long 20 mm flutes, the arms length will be insuffisant, it will be necessary to use the extension.
For this, I often use the electrical sheath 20 mm diameter, a sleeve, a piece of pipe, some tape and some clamps.
It is essential to avoid using the existing pieces for electric sheath, these connections are not regular shape (unlike those used for plumbing, which will be used for larger diameters), the air column will lose its perfectly cylindrical shape, which means a false flute with detuned harmonics, and for an overtone flute, it’s sad!
PVC FLUTES 25 mm
For larger diameters, it will be the next article, not yet finished but it comes,
do not hesitate to leave your comments, measures and prototypes, this article will evolve with the continuation of my works and your contributions, and subscribe to follow the next articles!