How to make a simple Air Horn. These horns are LOUD! They can be scaled up as I show in the video and made even larger still, but be aware that the bigger you make them the more air they will take to function.
I went through quite a few ideas before coming up with the final design. The only tools required are a hand saw and scissors. Isn't it great when a project is that simple?
Parts (small version):
Parts (larger version):
Both horns are operated using a large manual air pump in the video, though they can also function using compressed air or simply by blowing into the inlet with lung power.
If high pressure air is used it might be necessary to find a more durable diaphragm. Any sort of rubber or film should function nicely, and can be stretched over the end of the T and held in place with a hose clamp rather than being pressed in with a plug.