Acoustic-tube estimate for notch, rim-blown, transverse, and fipple flutes.
Enter your tube length to find its natural fundamental note. Ensure your tube ID and wall thickness are selected below first.
Vent is kept closed for the primary scale. It adds a small closed-hole correction to notes below it. Defaults to the acoustic midpoint to overblow the fundamental.
Notch/Embouchure:
Overblow comp adjusts finger hole targets flatter/sharper to compensate for blowing pressure changes in the upper octave.
Physical distance from the left edge of the tube to the center of the embouchure hole. Note: Embouchure hole size is selected in the table below.
Feature
Note
Freq (Hz)
Diam / Bit
Dist. from Top
Dist. from Bottom
Gap
Enter your preferred hand-comfortable positions or gaps (top hole first). Each lower hole's required size depends on the ones above it, so it solves top-down. Drill your nearest bit undersized and file up to the required diameter.