Air Rotator with Deflectors (1Q40.82)
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A rotating bar has tangential air jets at the ends of the arms and deflectors which may be swung into the air streams. If the deflectors are out of the air streams, the device will rotate like a garden sprinkler. If the deflectors are in, and air velocity is low, no rotation is observed because the reaction force of the air leaving the jet is balanced by the force of the air striking the deflectors.