Can anyone post, or give a link to, a sketch of the precise inside profile of a Boehm system flute, i.e. “parabolic” head part, plus cylindrical bore ?
Of course, the part I’d like to understand better is the head…
Hey Zoob you might want to repost this question on the Flute Forum, or the Woodenflute forum.
MarkB
Or you just might buy an old one from a pawn shop and have a machine shop saw it in half for yer! I’ve got a pretty decent bandsaw…
serp
The parabolic head joint is for the most part
a simple taper. Boehms headjoint has a bore of 19 millimeters and gradually reduced in diameter by nearly 2 millimeters. The position of the cork sets up octave alignment.
Its precisely 17.1 mm at the cork and 19 mm by time it just reaches the tuning slide.
Boehm’s claims a slight bulge midway but instruments that have been measure seem to be a straight taper.
The book to get is, “The Flute and Flute-Playing” by Theobald Beohm. Lib. Congress Card No. 64-15498. Try Barnes & Noble or Amazon.com used books.
Let me know what other measurements that you might need. He uses a length/bore ratio of 30.
Thanks for all Daniel.
I had actually borrowed once the book from a friend. But after you post I went and purchased one to-day. Brand new, hard-cover (fabric), with a 1994 ©. A bit expensive (ca. $40) but well worth it. Apparently this French translation is readily available from Editions Aug. Zurfluh (!), Paris.
Oh my… This reading is so fascinating that it may cut on my practice time…
bump