Chiff and Fipple Forums

Yes, sorry, I wasn't clear that that was what I was suggesting by 'closed pipe resonance'. I slipped up on the Hz because they were the number I was diving 343 by to get millimetres..

I will have a look at the spectra with a tube on. The reason for experimenting with just the heads of my aged assemblage of whistles was that I need to get the sandpaper out to get most of the tubes back on.

I'm guessing that the warbly effect suggests that at that point the two regimes are not in a simple harmonic relationship. I had a look at the spectra across the first regime change when blowing just the head a week or so ago.(I did post something but decided it was out of step with the current foc...

The 5kHz is in the right ballpark to be an open tube resonance in the calibrator. Back to pushing string?

Lots of small posts because I have been having trouble making this post all in one go for a couple of days - getting a server error

When making the shhhh sound with the lips are we tuning noise or selectively amplifying/attenuating parts of it with a resonance in our mouths. So unlike when we whistle with our lips there is no feedback to the jet. Maybe we are also selecting what gets to our ears via our head cavities.

Terry McGee wrote: ↑Mon Apr 03, 2023 4:33 pm Plausible?

Yes, sorry, I wasn't clear that that was what I was suggesting by 'closed pipe resonance'. I slipped up on the Hz because they were the number I was diving 343 by to get millimetres

So maybe something to do with the jet at 5Hz that changes only slightly as tube is added plus something about right for a closed pipe resonance from the tube. Can your ear detect the 5Hz tone or is it lost in a hiss of white noise? Blowing the wrong way through whistle windways sounds like a hiss to...

How about an artificial mouth to give a reservoir at the inlet end, like Fabre et al with their recorders? There probably isn’t much energy in that sound, but making the sound might use more. Energy loss = resistance. What’s its spectrum like? Vortices from an orifice (i.e no edge) when we whistle w...

Hmm. Interesting! I am not sure the flow change is important for these small changes in pressure. I wonder if we should regard the regulator as a flow control - through the whole system including itself - rather than being a pressure control. So we are looking at the pressure difference across the c...

Yes, I think something like that. Maybe the energy saved by not stirring up as much atmosphere at the lower velocity exit from the tube was more than that lost to friction along the tube. The 5 degree cone that would be on the windway exit if it was a venturi tube would presumably reduce turbulence ...

Their native language is French, and mine isn't, so I'm not going to hold any translation issues against them. It wasn't a criticism but a recognition that some of the flow of the presentation derives from a language with different means of expression and sequencing of information. Which for me req...

@Tunborough. Sorry I wasn't clear, I was meaning what I think you are saying. Whatever happens at low pressures can't change the relationship at higher pressures, just give a kink and maybe a discontinuity in a graph 'before' that. A plot of Q v. sqrt(P) once Bernoulli and Darcy-Weisbach describe th...

I don't usually watch Eastenders, but when I have, I've often found I had to ease into it. Me too, but I guess not so much. Coronation Street - no problem. The Beeb's newscasters are easy as pie. They are now, when I was a kid it was really plummy RP. I still get cross when I can't tell from the co...

I'd say the pressure doesn't vary consistently with air speed squared until above 200 Pa (20 mm H2O), and when it does, there's an offset of 60 to 100 Pa, depending on the recorder: P = m * v^2 + offset. That's puzzling me. Bernoulli's equation doesn't have a constant. Even if the the pressure does...

Nanohedron wrote: ↑Sun Mar 26, 2023 2:37 pmI realized that her name was actually "Barb".

If she had said her name was Barbara would the pronunciation of the first vowel have been remarkable?