Anyone else had a shot at a bull-roarer (I got a couple of hits from "Search") ?.
I was expecting a degree of tuning, having read about them in one of the SPT books; but within ½-hour of a plank of softwood, I had one working. A second one worked fine, too.
I used a spinner shape (teardrop), rather than an oval; mainly for 'aesthetics', but also on the assumption that fishermen had done the research on the appropriate geometry (no comments on Reynold's number, please).
No flint involved, I'm afraid. All steel cutting surfaces. And no photos: I passed the risk of broken windows onto the neighbours' children.
I was expecting a degree of tuning, having read about them in one of the SPT books; but within ½-hour of a plank of softwood, I had one working. A second one worked fine, too.
I used a spinner shape (teardrop), rather than an oval; mainly for 'aesthetics', but also on the assumption that fishermen had done the research on the appropriate geometry (no comments on Reynold's number, please).
No flint involved, I'm afraid. All steel cutting surfaces. And no photos: I passed the risk of broken windows onto the neighbours' children.