How to make a simple Air Horn. These horns are LOUD! They can be scaled up as I show in the video, but be aware that the bigger you make them the more air they will take to function. Get your free audio book from Audible here: http://adbl.co/17ujzYW (I finished The Martian, highly recommended) Parts used for this project (small version): 1"x 1"x 1/2" T Fitting 1" x 1/2" Adapter 1" Plug 6" x 1/2" PVC Pipe Freezer Bag Long Funnel (found at auto parts stores) Parts for large horn: 2"x 2"x 2" T Fitting 2"x 1" Adapter 2" Plug 6" x 1" PVC Pipe 1" Coupling Freezer Bag Large Funnel 2"x 1" Reducer 1"x 1/2" Reducer 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. #NightHawkInLight ~-~~-~~~-~~-~ Check out my latest video: "How To View Invisible Air Currents With Lasers" https://www.youtube.com/watch?v=K94Cc21KEIA ~-~~-~~~-~~-~