Mechanical Music Digest  Archives
You Are Not Logged In Login/Get New Account
Please Log In. Accounts are free!
Logged In users are granted additional features including a more current version of the Archives and a simplified process for submitting articles.
Home Archives Calendar Gallery Store Links Info

Spring Fundraising Drive In Progress. Please visit out home page to see this and other announcements:     Thank you. --Jody

MMD > Archives > September 2006 > 2006.09.23 > 04Prev  Next

Nodal Holes in Flue Pipes
By John Nolte

Ed Hattrup asked how to determine the location of "nodal holes" to
make the pipes sound the twelfth (third harmonic), the octave and
other pitches.

An open pipe overblown to the octave has the hole drilled at about 43%
of the length of the pipe, measured from the languid to the top of the
tuner in a slot, or to the top of the pipe if there is a scroll over
the top.

Double overblown pipes are quite rare.  I don't know of any organ pipes
that are made to play the same pipe at two different overblown pitches,
if you were thinking of that.  The manner of blowing would also have to
be adjusted as it is on a mouth blown flute or recorder.

Overblown pipes are considered the most challenging to voice well.
It can be done either for the tonal effect of the different harmonic
structure of the note, or to drive a pipe to a very high output.
If all of the parameters -- wind pressure, toe hole, flue, and cut-up
-- are extremely precise, the desired over-blowing can be achieved
without nodal holes.

John M. Nolte - Nolte Organ Building & Supply, Inc.
Milwaukee, Wisconsin

(Message sent Sat 23 Sep 2006, 17:01:16 GMT, from time zone GMT.)

Key Words in Subject:  Flue, Holes, Nodal, Pipes

Home    Archives    Calendar    Gallery    Store    Links    Info   

Enter text below to search the MMD Website with Google

CONTACT FORM: Click HERE to write to the editor, or to post a message about Mechanical Musical Instruments to the MMD

Unless otherwise noted, all opinions are those of the individual authors and may not represent those of the editors. Compilation copyright 1995-2020 by Jody Kravitz.

Please read our Republication Policy before copying information from or creating links to this web site.

Click HERE to contact the webmaster regarding problems with the website.

Please support publication of the MMD by donating online

Pay via PayPal

No PayPal account required

Translate This Page

. .