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Noisemakers

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Noisemakers

Unread postAuthor: SpudBlaster15 » Fri Dec 04, 2009 3:05 am

New Year's eve is fast approaching, and since I didn't do anything interesting last year, I'm planning to make up for it during the transition into the new decade. My goal is to create lots of noise while utilizing as little funding and expensive resources as possible.

In addition to a few 'magic silver dust' based devices, I'm also planning to construct a propane fueled noisemaker, which will enable me to create loud bangs without wasting substantial amounts of expensive chemicals. The current design is somewhat like an advanced combustion launcher with a sound directing cone instead of a barrel, and it should be capable of reloading quickly and easily.

Anyone else planning to build noise making devices for New Year's eve?

Note that I'm not posting this thread to ask for suggestion on my own designs, but to provide a place to discuss your own.
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Unread postAuthor: Moonbogg » Fri Dec 04, 2009 6:25 am

Dry firing my hybrid is pretty damn loud to say the least. Maybe consider a cheap and simple hybrid chamber with super short barrel?
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Unread postAuthor: inonickname » Fri Dec 04, 2009 6:39 am

Clicky.

I'm planning on doing a small show, so a few reports will come along with it. Nothing too big though, just a few shells etc. on private property.
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Unread postAuthor: starman » Fri Dec 04, 2009 10:19 am

Trip Thunder always comes out for me. Basically the same solution as Moonbogg, except 1X combustions with burst disk barrel stumps...really really LOUD... :wink:
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Unread postAuthor: Techie » Fri Dec 04, 2009 4:15 pm

My pneumatic may a quite loud pop when i fire water into the air. Filling a ziplock bag with propane, then making a gas trail to light is always fun :D
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Unread postAuthor: Technician1002 » Fri Dec 04, 2009 7:27 pm

I sometimes do the 50/50 welding gas mix in small zip lock bags placed in a lunch sack. The lunch sack is lit on top and used as a fuse. It is too loud to be next to it when it goes off. I haven't done that in a couple years due to my urban location. That was a country regular activity.
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Unread postAuthor: turner » Fri Dec 04, 2009 7:47 pm

what about huge fire crackers? i lit some off about as wide as a quarter, and longer than my palm and people could here it everywere
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Unread postAuthor: Technician1002 » Fri Dec 04, 2009 7:54 pm

turner wrote:what about huge fire crackers? i lit some off about as wide as a quarter, and longer than my palm and people could here it everywere


Most places those a illegal in a major way. Discussion of that propellant is against the spudfiles forum rules. It has a solid oxidizer. Can you think of a possible noisemaker that is not solid oxidizer based?

Flaming projectiles are also on the Spudfiles no-no list. If you want a tracer, may a recommend glow sticks? They work great.

Please don't mention fireworks again. This is even more important on the illegal ones. It is a quick way to receive the wrath of the moderators.
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Unread postAuthor: turner » Fri Dec 04, 2009 8:03 pm

oh ok i thought it would be cool as long as it wasnt like powering a gun or anything.
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Unread postAuthor: Mr.Sandman » Fri Dec 04, 2009 8:09 pm

You could always start a sodium hydroxide and uluminum reaction inside a two liter :D :lol: I know I know i shouldnt have said that. hmm maybe a high pressure dry ice burst disk cannon.
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Unread postAuthor: DYI » Fri Dec 04, 2009 8:16 pm

Unfortunately, I have no means with which to ring in 2010, and making noise would be a decidedly bad choice in my situation.

Mr. Sandman, propane-based noisemakers can be considerably more effective than their pyrotechnic counterparts (and certainly moreso than over-pressurizing soda bottles), especially with large chambers, 2"+ diameter burst disks, and >10X hybrid mixes.

Normal people measure sound in decibels. It has always been my belief that, when spudders are concerned with making noise, they should be measuring in pounds per square inch :wink:
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Unread postAuthor: turner » Fri Dec 04, 2009 8:21 pm

or maybe just a pneumatic burst disk set-up building a combustion would be more expensive to just make noise
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Unread postAuthor: DYI » Fri Dec 04, 2009 9:19 pm

To make noise properly, you'll need combustion. Due to the faster gases and often higher pressure, there is a noticeable difference in the quality of the sound produced - much more defined and longer ranged.

This is, I suspect, due to something of a shockwave effect - rather than filling an entire volume with released gas, the pressure is concentrated at the boundary of the expanding region and drops off rapidly behind this boundary. Thus, as you drop the release time, increase the expansion speed, and increase the pressure, the observed overpressure propagation will move away from an inverse cube proportionality and toward a linear proportionality, which is obviously much more desirable not only for sound quality, but for range as well.
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Unread postAuthor: Biopyro » Sun Dec 06, 2009 2:00 pm

Not necessarily. A drinks bottle pumped past 10bar will give a mighty boom. Larger bottles need less pressure, but wrapped in tape you can really get some noise from them. Be sure to wear ear protection though!
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Unread postAuthor: VH_man » Sun Dec 06, 2009 3:35 pm

If a pressurised soda bottle isn't a suitable nosiemaker I don't know what is... After I did this, My parents came running from the house across the street because they thought I had blown myself up. Its also Really easy to set up and can be triggered from a distance with another noisemaking device (air rifle, cannon, ect). It's also really fun to fill it with confetti before you pop it.
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