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Video added: Time to make some NOISE! + diagram

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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Video added: Time to make some NOISE! + diagram

Unread postAuthor: xpitxbullx » Thu Jun 12, 2008 2:09 pm

Independence Day is coming soon so I made a barrel attachment that uses a tennis ball as a burst disk without actually shooting the tennis ball. I have too many houses around me to actually fire anything in my neighborhood.

Once the tennis ball passes the two exhaust ports, it is stopped with an end cap. a ramrod is permanently attached to the tennis ball and is guided out of a hole in the end of the cap.

This should make for rapid reloading and firing. The pressure created by the tennis ball should make a nice loud BANG! Hmm...wonder what my C:B ratio is on this thing. :D

After I fire it tonight, I'll assess whether the exhaust ports need deflecting.

Jeff

UPDATE: Two more exhaust ports were added for a total of 4. Much louder now. :lol:

CRANK UP YOUR VOLUME
[youtube]http://www.youtube.com/watch?v=hmlcf3m1Uec[/youtube]
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Attachments
noise maker3.jpg
Here is is attached to the chamber
noise maker1.jpg
plunger down
noise maker1.jpg (33.71 KiB) Viewed 910 times
noise maker2.jpg
plunger up
noise maker2.jpg (31.18 KiB) Viewed 910 times
plug.gif
plug is permanently attached so measure many times before gluing it together. An end cap is on both ends of the ramrod.
plug.gif (28.84 KiB) Viewed 859 times
Last edited by xpitxbullx on Tue Jun 17, 2008 6:17 pm, edited 7 times in total.
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Unread postAuthor: starman » Thu Jun 12, 2008 2:26 pm

Good deal! I'm in the process of finishing my noise makers, 3 of them, in time for my 4th gigs. I'm using burst disk'd barrel stumps with huge effect.

Have you thought about 4 or even 6 exhaust ports? at least portage equal to the square area of your chamber breech? My thought is you'll be unnecessarily choking off your flow and thus your db's... :wink:

I'll be curious your impression of the noise level of this. It's hard to compare non-instrument measured noise levels over a written media, very subjective.
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Unread postAuthor: THUNDERLORD » Thu Jun 12, 2008 3:03 pm

Hope you plan on firing it remotely the first couple times, then inspect it after each Boom.
Looks like the ball, rod could smack into the end pretty hard, putting stress on it. (at the threads and chamber)
Also the pressure itself could really build up before hitting the noise chamber.

I'm sure you've already considered that probably.
Hope to see the updates on it. 8)
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Unread postAuthor: xpitxbullx » Thu Jun 12, 2008 3:07 pm

I just fired it. DAMN, this thing is much louder that the 1.5" potato barrel!

I made the port area equal to about the area of a 1.5" barrel. I love it! The tennis ball capture was perfect, also.

The rod doesn't hit the end cap. The tennis ball takes the blow. Since the tennis ball has only 1" to gain speed, it barely reaches the end cap.

Jeff
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Unread postAuthor: THUNDERLORD » Thu Jun 12, 2008 3:27 pm

Cool! Proper vid with sound is in order.
Maybe a night shot would be best for this. :wink: 8)
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Unread postAuthor: STHORNE » Thu Jun 12, 2008 3:33 pm

wow! very good thinking. You're using ammo, without actually using it...I LOVE IT!!!

For those who don't understand, could you post a diagram showing the internals?

Again, very nice work.
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Unread postAuthor: starman » Thu Jun 12, 2008 4:41 pm

xpitxbullx wrote:I just fired it. DAMN, this thing is much louder that the 1.5" potato barrel!

I made the port area equal to about the area of a 1.5" barrel. I love it! The tennis ball capture was perfect, also.

The rod doesn't hit the end cap. The tennis ball takes the blow. Since the tennis ball has only 1" to gain speed, it barely reaches the end cap.

Jeff


How is the poor tennis ball fairing? If it had any fuzz on it, it doesn't now.. :shock: ..taking the full direct high temp flame front and not being able to cool down through flight.

I thought your breech was 2"...sorry...
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Unread postAuthor: xpitxbullx » Thu Jun 12, 2008 4:47 pm

I'm using a ball that has been launched many time and had crusty fuzz. I'll let you know how long the ball can take the abuse as I use it over time.

The part that screws on is 2". Adapter to 2.5" barrel for tennis ball.

I could make the ports bigger or make more of them to equal the breech size but after firing it my ears were ringing for a while. Good enough for me. I'll use ear plugs next time.

Jeff

EDIT: Video coming soon.
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Unread postAuthor: starman » Thu Jun 12, 2008 5:00 pm

xpitxbullx wrote:I'm using a ball that has been launched many time and had crusty fuzz. I'll let you know how long the ball can take the abuse as I use it over time.

The part that screws on is 2". Adapter to 2.5" barrel for tennis ball.

I could make the ports bigger or make more of them to equal the breech size but after firing it my ears were ringing for a while. Good enough for me. I'll use ear plugs next time.

Jeff


Yeah I thought later I should have told you to wear plugs, the holder and anyone within 10 ft of the thing. My left ear tends to get the ring because of the way I hold the gun...tending toward the left.

This looks like a great idea! I'm going to put one together and see if there's any difference from the burst disk boom.
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Unread postAuthor: psycix » Fri Jun 13, 2008 5:04 am

Nice idea! When will the vid come?
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Unread postAuthor: xpitxbullx » Fri Jun 13, 2008 10:51 am

After comparing the loudness of the noise barrel to the potato barrel, turns out they were the same loudness. I'm going to remake this with a 2.5" tee.

I have a video of 2 flames shooting out of the sides but it was recorded too far away so I'll wait tip I make the single port barrel using a tee for one bigger flame out the front.

The tennis ball took about 20 shots and looked like it was taking it fine.

Jeff
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Unread postAuthor: psycix » Sun Jun 15, 2008 6:54 am

I think there should be more holes in the side.
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Unread postAuthor: xpitxbullx » Sun Jun 15, 2008 2:27 pm

I added 2 more ports for about 4" square area of holes. I'll do a bang comparison later tonight. I decided not to to with the tee for asthetic reasons.

I'll try for a good video at night of it.

Jeff

EDIT: Those extra ports were exactly what it needed. The tennis ball clears the ports and hasn't even hit the end cap. The "boom" is obviously louder. It's a different sound but its very loud. This works great, now.
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Unread postAuthor: psycix » Mon Jun 16, 2008 3:38 pm

Im glad to hear the extra ports worked :D
Try to optimize the flow and get thus the largest vent hole possible for the loudest bang. The pressure has to escape as fast as possible.
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Unread postAuthor: xpitxbullx » Mon Jun 16, 2008 9:58 pm

Do you think if I added 4 more exhaust ports that it would be even louder? It's pretty damn loud as it is. It may destroy the integrity of the barrel. All the ports are measured to the exact same level.

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