Plastic Singing Tubes

These tubes are whirled in a circle and the difference in velocity between the swinging end of the tube and the end held in your hand produces a pressure gradient causing air to flow through the tube. The ridges in the tube disrupt the air flow and the tube "sings". The pitch depends on the speed of rotation.

Pira DCS #

Plastic Singing Tube   Enclosed Plastic Whistle Tubes