Low D brass whistle

[Tunborough]

@David_Cooper

Can you give me the bore sizes in the Goldie and Grinter. I know they’re low F rather than D, but I can still use that as a guide. I need to know how narrow I can go while maintaining a decent lowest note, and at this stage I’m not looking to maximise volume, though in any case, with the ability to remove the adapter and turn it into a flute, it should still be able to play loud when it needs to.

In Search of the Optimum Bore