WTT: What's the effect of wall thickness?

Whistle
21

Zoob,
I’m not implying the Shaw has eyelets… I was puzzled by Stacy’s comment and found a closeup of the low D. It appears (to me) to be a raised area or a ‘formed ridge’ around those tone holes rather than normal drilling.

22

Zoob is correct.

Dave Shaw has intentionally used the chimney effect to bring the bottom holes for each hand closer to the other two holes. Those eylet looking things are the top, flared over surfaces of little tubes that extend into the toneholes.

Best wishes,
Jerry

P.S. Stacey, I think you knew that, right?

23

Still waiting for that reading list.

Drums fingers.

24

The thicker the wall, the faster you decelerate when hitting it in a car.

25

This subject was discussed almost to death, including the issue of internal chamfering amd the Coanda effect, a few months back in a WTT article string. I don’t know of any comprehensive discussion in a book, though. Careful analysis of Pete Kosel’s “flutomat” code (very clearly written in Javascript), will give you some insight into the mathematics for straight bores. Pete hasn’t obfuscated the code, and has named variables reasonably, and provided good comments. A great exercise for someone more a mathematician and physicist into fluid dynamics, would be to modify his program to include tapered bores. Probably provide months of fun for someone so inclined! :smiley:
serpent

26

Thanks, Serp.

That’s helpful. I’ll look into the old WTT threads again. In the meantime, I’m wondering if anyone could provide definitions for some of the technical terms, especially in Daniel’s and Thomas’ posts?

Again, I’m very appreciative of your help.

Best wishes,
Jerry

27

Hi again, Jerry! :smiley: Remember, my friend, you asked for this!

http://ccrma-www.stanford.edu/CCRMA/Courses/150/woodwinds.html

You are gonna be soooo sorry!!! (I know I am! Now I got more homework to do. Thanks a lot, you kniggggggett!!)
Cheers, :smiley:
serpent

28

Sigh

Well, I AM glad I asked. If there’s more stuff like that you know of, please let me know.

Best wishes,
Jerry

29

http://www.phys.unsw.edu.au/~jw/fluteacoustics.html

http://www.phys.unsw.edu.au/~jw/woodwind.html

http://www.phys.unsw.edu.au/~jw/fluteacoustics.html#cork

http://www.phys.unsw.edu.au/~jw/fluteacoustics.html#cutoff

http://www.phys.unsw.edu.au/~jw/WOLFE.pdf

30

Thanks, Thomas.

As always, I very much appreciate your help. Great stuff.

Best wishes,
Jerry

31

I have the math information from Peter Hoekje on the conical bore correction. Putting into code is not an easy task. Maybe some day.

32

Please elaborate.