The most familiar ducted vertical flutes are the recorder, tin whistle, and tabor pipe.
One historical variety has a slightly tapered (decreasing diameter) bore with 6 tone holes on the top side.
The range is a little more than two octaves and the common keynote is "D" major.
like the tin whistle and tabor pipe, relies on overblowing to change registers instead of pinching open a thumbhole, recorder style, to "cancel" the fundamental harmonic (Bessarabov 1941, p62 – p63).
This version uses a standard cross-blown flute head joint bent in a "?"