Signup for your FREE trial of Wondrium here: http://ow.ly/O6AN30siJKg Bird water whistle's have a really interesting mechanism. I made a 2D transparent version so you could see what's going on inside. I also explain how whistles work. Including the kettle whistle. CREDITS: Air jet impinging on a wedge simulation by Philip Simons using Sjubb: You can buy my books here: https://stevemould.com/books You can support me on Patreon here: https://www.patreon.com/stevemould just like these amazing people: Frank Hereford Will Ackerly Brendan Williams Cameron Leigh Middleton Matthew Cocke Frederic Merizen Jeremy Cole Alan Wilderland Joel Van der loo Glenn Watson Doug Peterson Paul Warelis John Zelinka Alnitak Grant Hay Heather Liu Marshall Fitzpatrik Lukas Biewalk JJ Masson Ben McIntosh Damien Szerszinski Twitter: http://twitter.com/moulds Instagram: https://www.instagram.com/stevemouldscience/ Facebook: https://www.facebook.com/stevemouldscience/ Buy nerdy maths things: http://mathsgear.co.uk/