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Construction of Monster Cannon

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Construction of Monster Cannon

Unread postAuthor: Mike32 » Tue Nov 08, 2005 10:02 pm

I soon will start on my latest cannon, my third. I've been thinking about it for a few days and have figured it out. It will consist of a 15 foot piece of 8inch Schedule 40 PVC cut in to three 5 foot lengths. They will be placed side by side in a roller cart. Each will be capped on one end with a schrater valve. On the other end will be a automatic modded sprinkler valve. After the valve on each the pipes will connect and form something like a _ _|_ _
so one pipe on one side, 2 connect on the other, and they go to a T pipe that is not glued in, so the barell that goes into it can move at a free 180 degrees.
It will have multiple barrel attachments ( not quite sure how to do that yet) and the 3 inch barelle will be 15-20ft long.
The reason for 3 pieces of the 8 inch pipe instead of one long piece is to allow me to either fire 1 shot withall the power, or 3 seperate shots at a 1/3 of the power.

The total chamber size will be about 8000cu in
Luckily i found a great irigation store that sells all this for real cheap, plus they give me the contractors discount which is 30% off!

I've included a drawing to give an idea of what it will look like.

Sorry how bad it is, im no artist
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Unread postAuthor: CS » Wed Nov 09, 2005 12:01 am

Your ratio wont be that bad.
8x15=120
3x20=60
2:1 ratio
When you said your going to attach schrader valve to the ends I assume that you plan on pumping it up with a bike pump (manual/ electric) If so thats not going to work very well when you have to fill up that much area so I would suggest a air compressor if you planned other wise. If you end up building it you defintly need to post videos and pictures. If I may suggest I would recomend that you arrange the air tanks like in the picture below and then have the barrel a straight shot out of the top tank with a tee to connect it to the bottom two tanks. I think it would just look cooler arranged this way (no practical use behind design besides that it might be more compact)
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Unread postAuthor: Mike32 » Wed Nov 09, 2005 12:34 am

Hi, thanks for replying with some feedback. Yah that design works good to, ill have to try both once i get the parts and see which is easier to make, im trying to be as cheap as possible but still having a great cannon.
And no i wont be using a bicycle pump, im using a compressor that does 100psi at like 2.8cfm probably will still take like 5-7min to fill to 100psi since the cfm measures are usually overrated. The cool thing is though this gives meaning to Cannon :p it will look like one with it on a rolling cart , should be enormous =]

Ya im not quite sure on barel length, if you use the pneumatic calc it usually says something like 400ft long lol
I wonder if its possible to make some type of tellescoping barel, since 2-25ft is quite long =]

Also, the largest cannon ive seen on line is a 3000cu in one that can shoot tennis balls at mach2 (1300mph)with a 10ft barel mine will be 8000cu inches and have a 20ft barel so i probably will be able to improve on that speed ( id hope ;)

Thanks, and of course ill be taking LOTS of pics and videos once its done =]
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Unread postAuthor: Mike32 » Wed Nov 09, 2005 12:41 am

wee i just calculated my specs from http://www.bavetta.com/aircannon.html

im supposed to have a 350ft barel, and exit velocity of 564m/s
and max height of 53375ft
:P
Of course theres no way id ever reach those estimates hehe but its still fun to imagine =p
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Unread postAuthor: boilingleadbath » Wed Nov 09, 2005 5:46 am

The <a href="http://www1.iwvisp.com/thehalls/GGDT/index.html">GGDT</a>... accept no substitutions.

Assuming you are planning on using a sprinkler valve, a tenis ball gets a top velocity of 350 feet/sec at 120", and a 150 g projectile gets a top speed of 335 feet/sec at a bit over 200"
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Unread postAuthor: Mike32 » Wed Nov 09, 2005 9:42 am

hmm thats it?

I was hoping for much better results, I really don't want to have to play for 3 supah valves jeeze thats like 300+ bucks =\

And ggdt doesnt work on my computer, it gives me an error7 out of memory error =(
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Unread postAuthor: boilingleadbath » Wed Nov 09, 2005 3:40 pm

Well, you could have 1 supah, an auxilary chamber, and a few 2" ball valves (PVC ones go for like 12$); use the auxilary chamber to seat the supah (by oppening and then closing a small ball valve that lets the air into the pilot volume), then open the ball valve connected to the chamber you wish to fire.
Like this (the periods are placeholders):

(chamber)-(2"bv)-|
(chamber)-(2"bv)-|--(supah[pilot])=========
(chamber)-(2"bv)-| . . . . . . . .|
(aux chamber)-(bv)------------/

On second thought, your aux chamber might have to be fairly big ... it'd probably be better to have the seating air come from the chamber to be used - have 3 small ball valves placed chamber-side of the 2 inchers.
(this works if you have 2 supas too, although you may want to use 3" ballvalves.)

With 2 (estimates of) supahs at 100 psi (max recomended operating pressure: 120 psi), you get 600 feet/sec with a 300 g projectile and 120"x3" of barrel (one chamber), and 1 supah gets you 500 feet/sec. 240"x3" of barrel get you 700 feet/sec with 2, and 570 with one.
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