The backpack cannon

[deathbyDWV]

Here is the cannon i compleated a few days ago. It will launch a rubber ball over 100 yards at 60 psi. I will soon take it up to 100 psi. I want to add a co2 setup but don't have the money now. Currently pump it up with an air compressor or hand pump. I am also going to paint it. So here it is.

Vid of shooting water. SWEET!!!
(it's the only good vid i had)
[youtube][/youtube]

[maverik94]

very cool! Only thing I have to say...well, 2 things. One is: You're C:B Ratio (Chamber:Barrel Ratio) does not look that great, I would have used a smaller bore barrel. Also, I have read somewhere that shooting water in a pvc gun can cause it to crack...but I can't remember where I read that. Anyway, cool compact design, I like small pvc guns.

[deathbyDWV]

Thanks alot. This is really my first small cannon.

[mark.f]

I like it! Very clean and compact. Looks 'nifty'.

[jrrdw]

Nice work for a 1st cannon. I wonder if you got the idea from sgort87s master piece, if you've seen it.

[deathbyDWV]

Thanks but it's not actually my first. It's my first small cannon. The others are large and monsterous.

[Marffy]

cool, i might make one. but with a tennis ball barrel. isn't yours like a 2inch barrel? ill make mine a 2 1/2 for tennis balls. i belive its 2 1/2. correct me if its not.

[Procyon]

Very nice.

Guns that can be carried can be much more practicial. I really like your design. Perfect for water or paint ballons. You may want use your money on a 12volt inflation pump rather then CO2. Even if you have your own fill tank CO2 has allot of drawbacks and can be rather expensive.

[deathbyDWV]

Thanks for the comment's. I just noticed both of them. Since the original post i have added a hand pump to the bottom and a quick connect. Also a golfball barrel. I will soon paint it. When i get it completely done i'll make a new post, as this page would have too many pictures

[cannonmaster]

nice gun but i may suggest on a next gun or modify this one to make the release valve the same size as your barrel if you did that than you would have more power but i think that you should invest in a 12 volt pump rather than CO2 like procyon said

But for a first small cannon it is awesome and compact

Great job!!

[Mr.Sandman]

nice gun but i may suggest on a next gun or modify this one to make the release valve the same size as your barrel if you did that than you would have more power but i think that you should invest in a 12 volt pump rather than CO2 like procyon said

But for a first small cannon it is awesome and compact

Great job!!

Umm no. A co2 cetup is much better than wasting money on a 12 volt compressor. Those cheap little toys(yes they are basically toys) will burn out within a few weeks. And also his valve is fine for what he does with his cannon.

[suburban spudgunner]

Umm no. A co2 cetup is much better than wasting money on a 12 volt compressor. Those cheap little toys(yes they are basically toys) will burn out within a few weeks. And also his valve is fine for what he does with his cannon.

But wouldn't the use of CO2 in a PVC gun cause the PVC to become brittle?

[deathbyDWV]

I'm fairly sure that using co2 in pvc only makes it brittle if it is put in too fast or the liquid is sprayed in. I kind of turned away from the co2 idea because of cost issues. I mounted a small pump to the bottom and it doesn't take very long to pump it up while away from any air compressor. I ran out of spray paint today so once i buy some moar I will post it.

It now has the pump mounted to the bottom.

Will soon be painted

Now has a golf ball barrel.

I'll probably have new pics up within the week.