Have any whistle makers tried building a whistle with the ramp on the bottom of the blade instead of the top? Would this have any effect on the sound/playability of the whistle? I realize it would be harder to make in most cases.
Very true-- even tiny variations in measurements in this region of a whistle can make HUGE differences in sound.
Regarding blunt blades-- my Overton A has a blade with a nearly vertical edge, with little ramp to speak of, and it plays like a champ. On occasion while voicing a whistle, I’ve tried playing it a bit before filing the ramp and it sounds surprisingly OK.
There are whistles made like that but the end is closed and it has no tone holes. Just plays one note so you need several to play a tune. The notes are more steady and very consistant and you would not be able to raise or lower a note by speeding the air flow or slowing it. Works the same way a pan flute does but you don’t have to shape your mouth to play it.