The quena is a very ancient Peruvian musical wind instrument, arises in the pre-Inca era created by some of the cultures that conformed the territory of ancient Peru. This musical instrument is made in empirical way with good results of sound. This work described the mathematically acoustic behavior of the principal parts of the quena, such as the blow end and the tonal holes. The mathematical model allows finding the physical length of the quena and the location of the tonal holes. The equations of the model, consider end corrections due to the tonal holes, to the open end of the duct, to the blow end and the small cavities of air that are formed when the player cover the tonal holes with his fingers. Measurement: 12 1/4" L x 1 1/8" W x 1" approx
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