Tunborough wrote: ↑Thu Jul 27, 2023 8:45 am
I don't think a telescoping body made of thin-wall brass tubing would introduce enough of a taper to make a whole lot of difference in the tuning.
That was part of the experiment. Interestingly, a trendline down the graph of the stepped bore is slightly steeper than some of the Mild tapered bores people have reported (eg on Carbony). But nothing like the Bold tapers such as Clarkes.
You might get a bit more of an impact if you made a section at the head end out of narrower tubing, with the rest of the body cylindrical. But that wouldn't give you much scope for telescoping.
My experience so far of that approach is that it tends to make the whistle sound brighter, which is not the direction I want to go.
A telescoping body with thicker-walled sections would have more of an impact on the tuning. Not sure how the narrowing steps would affect the sound.
Yeah, I can feel that experiment shadowing me around the workshop....
I once heard from a fellow who was making didgeridoos from nesting sections of PVC tubing.
Yeah, we had a spate of that some years back too. It was pretty impressive - one chap had used thickwalled white plastic Pressure tubing in nesting sections. In dark marker pen, he'd marked along the white tube the location of the notes he was likely to need. So when we switched from say Am to G to D in a set, he switched his drone note to suit. It was great as a novelty, but became a bit wearing after a while! The usual tweets, toots, scrapes, twangs, bongs, plus Blaaaahhhht.....