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Piston-Valved Americannon (Contest Applicant)

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Piston-Valved Americannon (Contest Applicant)

Unread postAuthor: Velocity » Sun Aug 27, 2006 6:57 pm

Cannon Name: Piston-Valved Americannon
Type of Cannon: Pneumatic
Chamber Size: 6" SCH 40 x 60" (1700 CI)
Barrel Size: 3" SCH 40 x 72" (510 CI)
Gas Source: 26 gallon air compressor
Valve: Barrel-sealing tee valve, 4" inlet, 3" outlet. Exhaust valve is an aluminum 3/4" Detrol quick exhaust valve actuated by a high-flow 1/4" blowgun
Special Details: Usage of 3" Aluminum Banjo Couplings (will add 2.5" SDR-21, 3" SCH 80, and 4" SCH 40 barrels in near future), heavy-duty 4" SCH 80 threaded cap for safety, spring-less piston design.


<img src="http://www.spudfiles.com/uploader/uploadFiles/frontangled32423.JPG">

I have had this cannon done for a while, but I have just not had enough time to post it. Don't mind the crappy picture; although it appears dirty, its actually really very clean. I call it Americannon due to its patriotic colors. The chamber is 6" X 60", while the current 3" SCH 40 barrel is 72" long. I would have opted for a 10' barrel, but I really cannot store or transport it in my house right now; my parents are pissed enough that I built such a large/heavy cannon.

<a href="http://www.spudfiles.com/uploader/uploadFiles/sideview234.JPG">Side View</a>

The cannon is mounted on a very simple stand; just a long piece of wood with two supports for the chamber.

The <a href="http://www.spudfiles.com/uploader/uploadFiles/barrelsupport234523.JPG">barrel support</a> was cut from a piece of plywood I had lying around in my garage

The valve is a homemade barrel-sealing piston valve. The inlet is 4", and the outlet is 3". It is exhausted by a 3/4" Detrol QEV, which is hooked up to my <a href="http://www.spudfiles.com/uploader/uploadFiles/fillsystem23423.JPG">universal fill-up and exhaust system</a>

A few pictures of the valve:

<a href="http://www.spudfiles.com/uploader/uploadFiles/valve34234234.JPG">Side view</a>
<a href="http://www.spudfiles.com/uploader/uploadFiles/valvebunchastuff234234.JPG">Larger side view (better light)</a>
<a href="http://www.spudfiles.com/uploader/uploadFiles/Backslightangled23423.JPG">Back angled</a>
<a href="http://www.spudfiles.com/uploader/uploadFiles/litbackangle31432.JPG">Back angled (better light)</a>
<a href="http://www.spudfiles.com/uploader/uploadFiles/backdarkpic2342.JPG">Another back angled picture</a>

I decided to use <a href="http://www.spudfiles.com/uploader/uploadFiles/camlockmain3242.JPG">cam-locks</a> for this project. The cam-locks are all 3", made by Banjo.

I have three <a href="http://www.spudfiles.com/uploader/uploadFiles/3lock23423.JPG">other cam-lock fittings</a>, which I will use on future barrels. The center cam-lock is already screwed onto a 3" male adapter which then enlarges the pipe size to 4"; perfect for a 4" barrel. The other two cam-locks will be used on a 3" SCH 80 barrel (already own it, just need to pick it up from school) and a 2.5" SDR-21 barrel (still need to buy it). When I receive these barrels, I will paint them and update this thread. In my ideal world, I will have a 3" SCH 40 X 10' barrel, a 3" SCH 80 X 10' barrel, 4" SCH 40 X 8' barrel, and 2.5" X 20' barrel (that last one will never happen...)

To pressurize this cannon, I use my 26 gallon <a href="http://www.spudfiles.com/uploader/uploadFiles/compressor23423.JPG">compressor</a> (using a bike pump would get really old, really fast).

I haven't done too much testing. So far, I shot a 20 ounce coke bottle (filled 1/5 with water) that split a 3/4" board (could be plywood or particle, not sure) at 20 PSI.
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Last edited by Velocity on Mon Sep 11, 2006 4:29 pm, edited 3 times in total.
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Unread postAuthor: schmanman » Sun Aug 27, 2006 7:03 pm

Wow !! very clean, this is a very nice cannon :D not too many cannons use 6 inch pipe.
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Unread postAuthor: Torch » Sun Aug 27, 2006 7:08 pm

Thats one of the best cannons i've seen, very very nice work! What do you use as a piston?
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Unread postAuthor: Velocity » Mon Aug 28, 2006 9:50 am

Thanks for the comments. For a piston, I use two 3" endcaps solvent-welded together. The endcaps are modified however, giving the piston an overall shorter length. There is a 4" diameter (about) circle of 1/8" neoprene on the piston, and that is the sealing face. No springs are used; just a special low-profile bumper that I built onto the piston.
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Unread postAuthor: LucyInTheSky » Wed Aug 30, 2006 2:36 pm

In the first pic your cannon looks quite advarage size, but then you here the dimentions!
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Unread postAuthor: Velocity » Wed Aug 30, 2006 9:30 pm

<a href="http://s94.photobucket.com/albums/l112/rmich732/?action=view¤t=AmericannonDemonstration.flv">Video Here</a> (about 6.2 MB)

The pressure used ranges from 15 PSI (lowest operating pressure I believe) to 25 PSI (the dry fire is at 30 PSI however). Sorry for such low pressures :cry: ...

I've said this about 100,264.3 times, but I will get a video up of this thing actually doing something (in other words, more than 25 PSI :evil: ). It may take years (hopefully not), but I'll do it :twisted: !
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Unread postAuthor: MrCrowley » Wed Aug 30, 2006 11:36 pm

nice video of the piston :shock: :twisted: i wanna see a 100psi shot!!! :twisted:
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Unread postAuthor: Velocity » Fri Sep 01, 2006 5:52 pm

MrCrowley wrote:nice video of the piston :shock: :twisted: i wanna see a 100psi shot!!! :twisted:


Thanks man! Trust me, I want to see a 100 PSI shot just as bad :twisted: ! Stupid 100 food backyard with old, angry neighbors surronding it... I once was hitting a tennis ball against the garage, and it accidentially rolled into the neighbors house. He was outside, and he saw it. All of a sudden, he started SCREAMING about how I was littering in his yard (or some other crap like that :roll: )

I really wish my house had a huge, huge backyard... I'd pull up to the side in my Ferrari F430, hook up my 300 gallon compressor to this cannon, and shoot full (with water) gatorade bottles at a target 400 yards downrange out of my 3" SCH 40 X 20' barrel.


... :cry: sigh :cry: ...
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Unread postAuthor: SpudStuff » Fri Sep 01, 2006 6:00 pm

rmich732 wrote:
MrCrowley wrote:nice video of the piston :shock: :twisted: i wanna see a 100psi shot!!! :twisted:


Thanks man! Trust me, I want to see a 100 PSI shot just as bad :twisted: ! Stupid 100 food backyard with old, angry neighbors surronding it... I once was hitting a tennis ball against the garage, and it accidentially rolled into the neighbors house. He was outside, and he saw it. All of a sudden, he started SCREAMING about how I was littering in his yard (or some other crap like that :roll: )

I really wish my house had a huge, huge backyard... I'd pull up to the side in my Ferrari F430, hook up my 300 gallon compressor to this cannon, and shoot full (with water) gatorade bottles at a target 400 yards downrange out of my 3" SCH 40 X 20' barrel.


... :cry: sigh :cry: ...


Lol Dream on. how far back does the barrel go into the valve?
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Unread postAuthor: SpudStuff » Fri Sep 01, 2006 6:01 pm

Wow 800 Posts. :D :D :D
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Unread postAuthor: Velocity » Fri Sep 01, 2006 7:12 pm

The barrel does not extend into the valve. Seen <a href="http://www.spudfiles.com/uploader/uploadFiles/camlockmain3242.JPG">here</a>, the barrel (at the left) ends in a male adapter, and screws into the cam-lock. The cam-lock is connected with the other cam-lock (not sure what its called), which then connects to the barrel.
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Unread postAuthor: ProfessorAmadeus » Fri Sep 01, 2006 7:22 pm

Why cant you get higher pressures? This is a very nice huge BEAST OF DOOM!! MAHAHAH!!! What the pressure rating on the 6 inch pipe? Mine is 120 PSI.
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Unread postAuthor: Velocity » Fri Sep 01, 2006 9:42 pm

6" pipe pressure rating = 180 PSI

However....

noise tolerance of neighbors = 30 PSI :cry:
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Unread postAuthor: SpudStuff » Fri Sep 01, 2006 9:53 pm

Wow fork the damn neighbors.
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Unread postAuthor: MrCrowley » Fri Sep 01, 2006 10:22 pm

I just bought some stuff for my piston today this is how expensive pipe cost in NZ:
3" 260psi tee - $60NZD
3"- 2" pressure bushing - $10
2"-1.5" busing - $10
2.5m of pressure GB barrel - $40

total - $120 :(
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