Mujitsu and Tairaku's Shakuhachi BBQ

Alan,

Thermal and viscous losses due to roughness of the walls (the so-called boundary layer effect) affect the harmonics more than the fundamental, giving a mellower tone. However this is always associated with decreased acoustic efficiency (FWIW).

Toby

What an interesting, amazing array. I do love those mouthpieces (and always, the learned input from Toby).

Alan Adler wrote:

Toby wrote:

Alan,

Thermal and viscous losses due to roughness of the walls (the so-called boundary layer effect) affect the harmonics more than the fundamental, giving a mellower tone. However this is always associated with decreased acoustic efficiency (FWIW).

Toby

Hi Toby,

I completely agree.  However in this case the inside diameters of all the rubber tubes I've tried have been equally smooth.  I think the softness is suppressing the harmonics.  I even have one tube (Shore A Durometer = 45) which is so soft I can't make the flute speak at all.

Best,

Alan

Yes, that is quite possible. A soft wall is going to flex at the pressure nodes of the standing waves. BTW undercutting of all the holes is highly recommended as any sharp edges increase turbulence and limit maximum output. Did I say that already? Make two identical flutes, round both upper and lower edges of all holes on one and see if the difference is noticeable. According to the acousticians, it should be.

Toby

lloyd wrote:

Please explain all the holes on the dishwasher flute. What am i missing here?

Hi Lloyd,

This flute, like most that I've made, plays 8 notes tuned in the key D minor.

Here are photos of some of my others.  Only the top one has fewer notes.

http://www.flickr.com/photos/20211654@N … 0/sizes/o/

Best regards,

Alan

Thanks Alan

So the additional holes are to enhance the sound but are not fingered- am I right?

On the pictured flutes  I can count up to 8 visible holes (+ a rear thumb hole  I assume). Whats going on??

Ta
lloyd

edosan wrote:

lloyd wrote:

Thanks Alan

So the additional holes are to enhance the sound but are not fingered- am I right?

On the pictured flutes  I can count up to 8 visible holes (+ a rear thumb hole  I assume). Whats going on??

Ta
lloyd

If I may add (not being a pro experimental flute designer/maker): The unreachable holes are to adjust the fundamental pitch, and there is probably no thumb hole on the back.

I went back and read my link again and realized that editing was needed.  Here is the edited version from that link:

http://www.shakuhachiforum.com/viewtopi … 406#p20406

"There are two unreachable holes at the bottom, D and C#.  When all reachable holes are fingered, the flute sounds primarily through the D hole but some of the sound is also emitted from the C# hole below the D.  Thus all notes sound through at least two holes.  This makes the timbre of the lowest D note somewhat more similar to the timbre of the higher notes."

And, by the way, there is a thumb hole.

Best,

Alan