Originally Posted by
StarDust4Ever
... A more expensive solution that would hold a lot more capacity would be one of those refillable CO2 cartridges mounted to the top tube, which would last a crazy long time since the CO2 inside is typically liquified. The typical usage is for air guns and beverage carbonators and just about anything else that needs a source for non-flammable pressurized gas. I believe you can get them refilled at sporting goods stores or paintball ranges. It would need a pressure regulator though otherwise the horn would likely explode.
A really good idea. Personally something that works with just standard CO2 cartridges would be fine but likely the freeze-effect of the CO2 gas would not work well with the diaphragm that would make the noise. What ever gas they use in the marine air horns should work fine though.
quote: noglider
Interesting idea. It would be more expensive, but I like the fact that it would be a lot less bulky. Also, since it would have a pressure regulator, it could have two or three buttons, one for each level of volume you want. You want super loud for when a motor vehicle is cutting you off very close, but you don't when you're coming up behind a pedestrian. Then again, if the pedestrian has headphones on and is where he shouldn't be, he deserves a loud blast.
A couple volume settings would be a very good idea.