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RE: undercut tone holes...

Author: David Spiegelthal
Date: 2001-11-21 20:28

My 'theory' (which, as I recall, is generally what Benade wrote) is that, as with nearly any airflow situation, rounded transitions create less turbulence than sharp edges, and even though intuition is often incorrect, intuition would suggest that a smooth transition between bore and tonehole (undercut or radiussed) would produce less turbulence than a sharp transition (straight tonehole) and that this might be acoustically advantageous. [Although I suspect there are situations where MORE turbulence might be desirable, e.g. the register tube (for 'tripping' the standing wave to effect the register change) or on a flute embouchure hole (again for 'tripping' the airstream to create the standing wave).]
Mark: I would guess that undercutting off-center (to the top or bottom side) would change the effective centroid of the tonehole, thus raising or lowering the pitch. No different really than adding cork or nail polish or electrical tape to one side of the tonehole.

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undercut tone holes...

IHL

2001-11-21 07:35