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What to do with the walnut shells left over from Christmas?
Make a whistling arrow .
I'd been toying with the idea for ages, and if you try and look up the physics/acoustics of such a thing it is a minefield... far better to just make one and see/hear what happens.

I used two old broken arrows to make one extra long to allow for the walnut and some extra sticking out so it would stick in the target or ground.

I drilled a hole in each side, just forward of centre. I fully expected to have to fiddle and fettle with the holes to get any sound.
I also thought it might take some time in the air to start whistling. The first test shot was into the garage (10 yards) from a tiny little Osage bow.
I lucked out, the relatively low speed just matched the whistle and she screamed.
(Errr, no, I mean I'd done extensive CAD simulations to ascertain the ideal velocity to excite the walnut into resonance )
There's no convenient way to post it on here... but if you take this link to my blog, you can see and hear that baby go.
How did whistling arrows develop? I have no idea, but maybe a neolithic guy fixed a walnut shell onto the end of an arrow for knocking birds out of trees without the arrow getting struck, maybe the shell got damaged and whistled? I'd expect he would keep that arrow for shooting over his mates heads to scare the crap out of them... . We haven't really changed much!
Del
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