Bb3 natural trumpet saxophone-shaped (Trompette Si bémol 3 naturelle en forme de saxophone) same harmonics as a valve trumpet
thingiverse
This project is featured at http://www.openbrass.org, and its trumpet design was inspired by the paper "Trumpet with near-perfect harmonicity: Design and acoustic results." To improve upon the original design, various adjustments were made based on other acoustics studies, such as thickness and sleeve dimensions. Check out the YouTube demos for a closer look at its performance: https://www.youtube.com/watch?v=NvPm9aHb9AQ and https://www.youtube.com/watch?v=_SHB_CY29JQ
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