Large *LOUD* Air Horn / Membranophone (updated 01 Nov 26)
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A VERY LOUD air horn/membranophone that uses a balloon as the diaphragm. A larger version of my small air horn.
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A VERY LOUD air horn/membranophone that uses a balloon as the diaphragm. A larger version of my small air horn. Great at sporting events, but don't point it at others when you're too close - that would be a good way to "start a conversation" (it is VERY loud).
I tried a few of the other air horns/membranophones out there but they tended to hurt my ears too much as there was no rearward protection for the user, so I designed a system that incorporates a deflector on the ring that holds the membrane/balloon on to the body. It deflects the vibration from the rear of the diaphragm back toward the front of the horn. Still just as loud out the front, but much easier on my ears at the back.
Assembly is very easy:
Cut a piece of balloon and stretch it over the back end of the chamber (fully open end). Hold it in place while you place the deflector cap on to hold it in place. The tighter you stretch the balloon, the higher the pitch. I get louder results with a tighter stretch and with thicker balloons.
Fit the horn into the other end of the chamber. Point it in a safe direction and blow into the mouthpiece.
There are three different sized horns here. The smaller one is much handier. The large one is a proper full mega-horn shape so amplifies properly and is definitely loudest. The medium 250mm horn is almost as loud as the full horn but will fit in a P1P, P2S, X1C etc. There is also an extension for the horn. The more extensions you add, the lower the pitch - also easier to blow as there's more back-pressure in the horn. Add three or four extensions and it sounds like a fog horn.
Designed so all parts will print without supports, but the large mega-phone horn can benefit from support just inside the rim.
19 Oct 26 v2 update:
Widened the support under the blowpipe on the chamber to improve printing with no supports
Added a snug fit end cap and printed diaphragms - these can be used instead of a balloon
- If using the diaphragm you may need to adjust the location when fitted to get the best sound (just like a real air horn). A little harder to blow, but LOUDER!
11 Nov 26
Added a threaded chamber and end cap deflector for a more secure fit with the printed membrane