2005 - Volume #29, Issue #1, Page #11
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Wind-Driven Bird Scarer
This wind-driven bird scarer has 8 counter-rotating blades that glint in the sunlight to scare off birds. There are two sets of propellers, with each set having four blades. Each set rotates in the opposite direction. A simple hammer mechanism on some models makes a repetitive clanging sound as the blades hit a metal d..........


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2005 - Volume #29, Issue #1