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finished, working prototype bullroarer.
it “cycles” the way it’s supposed to: it spins as far as it can one direction, and then spins back the other direction automatically, while i spin the whole thing one direction all the time, thus making the characteristic “bull roar” noise. i made it out of plywood, to test the theory. i’ve got a chunk of really dense hardwood that should make a better, louder noise.
SUCCESS!