Coming back from the moon with a bunch of cosmic drainpipes, a.k.a. low whistles/Irish fipple flutes:
MK Kelpie F | MK Kelpie D | Alba Low D | Alba Low C | Reviol Low D with 2 additional bodies (C & Eb) | Dixon Low D with an additional flute head
The whistles are quite different in sound and behavior but I like them all.
And a few smaller pipies (played not so often though):
Generation Bb | Feadog C | Dixon D | Feadog D | Generation F
Unfortunately, my music/video production machine has let me down these days, however, I've managed to make a couple of test recordings with the MK whistles (they were closer at hand). And here they are: