Since i was a little bit disappointet of the relatively low noise level of the original V29 whistle, i had to improve it. 

This whistle has larger cavities and therefore a lower pitch. 
The interval between the two tones is larger and more dissonant which boosts the impression of loudness. 

see details on the cut-image 

Airflow and labium is more optimized the air consumption is the same as with the original 

in addition you get a step-file and my solidworks project file so you can easily modify and implement your own ideas 

Use Brims!