I looked hard yet myself but there might be more ‘stuff’ out there about organ pipes. Problem would be that a whistle requires a two octave working range which implies compromise
I must confess that the art of “Ducted Flue” design is closely guarded by commercial Recorder makers.
You can find plans in a few “how-to” books, Like Irving Sloane’s “Making Musical Instruments” and Trevor Robinson’s “The Amateur Wind Instrument Maker”, but they give little amateur help. You can find some info here…
I will compile a better list and post later. The angle of the labium ramp determins the speed of register “break” and controls pitch stability. The labium ramp angle varies from a shallow Bressan Recorder and Tabor Pipe angle of 18 degrees for fast register changes and pitch bending to a steep 34 degrees, on some plastic Recorders, for Reedy tone and pitch stability. The variations to the voicing are Legion and each Designer can make modifications to suit any player.
Anything “Specific” about Ducted Flue Voicing Design that eludes your research? I keep a great deal of my humble 17 yrs of research in my head. If you don’t want to have this interesting subject posted here, (with help from other expert members) you can e-mail.
There’s some good info buried in those links. Thanks Thomas_Hastay. Emtor (Vargas Whistles) used have a nice “whistle maker’s notebook” page up on his site, but I see it (the whole site) is gone, now. For specific questions, you might try directly asking some of the more accomplished folks, here.
