I work in industrial automation and have a background in pneumatics. I think you'll be surprised at how inefficient pressurizing/moving air is. I think the most practical solution (if you can call it that) is likely carrying an air reservoir that can be pumped up with a bike pump, and having a valve to trigger the whistle. There isn't really a safe way to carry compressed air on a bicycle because it's inherently dangerous to transport. There are lots of ways to make an unsafe air reservoir for example what Chris Notap on you tube does.
this post was submitted on 07 Jun 2024
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