classical flute flared foot

C#6

Impedance

Acoustic and Fingering Schematic a covered tone hole or key pressed an uncovered tone hole or key not pressed a partly covered hole Details in fingering legend. Non-specialist introduction to acoustic impedance Non-specialist introduction to flute acoustics

This may be regarded as the fingering for F#4, but with a register hole opened two thirds of the way along, which weakens the first two minima without much changing the third. Hence it plays a note at the third harmonic of F#4.

Sound

Sound spectrum of a classical flute with a flared foot played using fingering for C#6.

Sound Clip

You can hear C#6 played by Geoffrey Collins.