Diaphragm Pneumatic Cannon Update 12/9/06: Vid+Dmg pics

[Zorrowannabe9]

This is my latest cannon, it is based off my larger scale design posted <a href="http://forums.spudtech.com/topic.asp?TO ... 6">here</a> (keep in mind this is only slightly based off of it.

The chamber is constructed of a 4' section of 2" pipe, and the barrel is a coaxial 3/4" Sch. 80 paintball barrel. The Valve is a diaphragm design, which is placed inside of the union joint. The diaphragm is constructed of an inner tube from a bicycle (same place I got the schrader valve.)

I have yet to do any serious testing, but it does work and quite well. It makes a quite satisfying "pop" noise when firing. Ill do some chrony tests at a later time. Since I know that my design works...now its time for my full sized one [}:)]. Tell me what ya think! Any Questions?

<i> full body shot
<a href="http://img211.imageshack.us/my.php?image=1313181ha8.gif" target="_blank"><img src="http://img211.imageshack.us/img211/2368 ... ha8.th.gif" border="0" alt=""></a>
Close up of rear/valve
<a href="http://img81.imageshack.us/my.php?image=1313182vf1.gif" target="_blank"><img src="http://img81.imageshack.us/img81/7668/1313182vf1.th.gif" border="0" alt=""></a>
full body shot #2
<a href="http://img223.imageshack.us/my.php?imag ... 4r1di2.gif" target="_blank"><img src="http://img223.imageshack.us/img223/884/ ... di2.th.gif" border="0" alt=""></a>
muzzle close-up
<a href="http://img224.imageshack.us/my.php?image=1313183qz6.gif" target="_blank"><img src="http://img224.imageshack.us/img224/3759 ... qz6.th.gif" border="0" alt=""></a>
close-up of barrel side of valve
<a href="http://img80.imageshack.us/my.php?image=1313185pf9.gif" target="_blank"><img src="http://img80.imageshack.us/img80/8232/1313185pf9.th.gif" border="0" alt=""></a>
close-up of barrel support (keeps barrel centered)
<a href="http://img80.imageshack.us/my.php?image=1313188tg1.gif" target="_blank"><img src="http://img80.imageshack.us/img80/9811/1313188tg1.th.gif" border="0" alt=""></a>
close-up of diaphragm/pilot side of valve
<a href="http://img207.imageshack.us/my.php?image=1313187rp5.gif" target="_blank"><img src="http://img207.imageshack.us/img207/7943 ... rp5.th.gif" border="0" alt=""></a>
115 PSI shot through 3 layers of 1/4" Masonite particle board
<a href="http://img155.imageshack.us/my.php?image=1323203rw4.gif" target="_blank"><img src="http://img155.imageshack.us/img155/1443 ... rw4.th.gif" border="0" alt=""></a>
Backside of above shot
<a href="http://img291.imageshack.us/my.php?image=1323204as0.gif" target="_blank"><img src="http://img291.imageshack.us/img291/9867 ... as0.th.gif" border="0" alt=""></a>
<a href="">Paintball at 100PSI Video</a>
</i>
<b><u>Test Results:</u></b>
<TABLE>
<TR>
<TD><b>Pressure</b></TD>
<TD><b> Speed (FPS)</b></TD>
</TR>
<TR>
<TD>40</TD>
<TD>547.7</TD>
</TR>
<TR>
<TD>45</TD>
<TD>581.7</TD>
</TR>
<TR>
<TD>82</TD>
<TD>697.6</TD>
</TR>
<TR>
<TD>100</TD>
<TD>771.0</TD>
</TR>
<TR>
<TD>115</TD>
<TD>810.0</TD>
</TR>

</TABLE>

[squeaks]

So does this gun work anywhere near as well as a piston valve gun? I'm assuming that you're design works a lot better than a modded sprinkler though since all a sprinkler is is a diaphrahm, just a much smaller seat.

[Zorrowannabe9]

ive never made a piston valve. but i will be doing chrony tests soon

[killagorrila99]

Look's like iplex parts... But your not aussie. unless OH GOD!

enough rambling, I like it. Dont use it for paintballing though

[Zorrowannabe9]

haha, thnx killa. I wasnt planning on taking this to any paintball field...might hurt a "whee bit."

[killagorrila99]

Haha, After seeing what this can do everyone on the opposition would forfit!

[PVC Arsenal 17]

Nice design. Really original. I've always loved diaphragm guns- made 4 so far and more to come. But I never thought of using a union before!

[Zorrowannabe9]

Bumping, added a video of it shooting at 100PSI, a couple dmg shots, and some chrony tests.

I would love to know how other peoples paintball cannons compare.

[MrCrowley]

I just made a paintball gun(SG Paintball gun)
ill try put up a vid at 100psi for you to compare.

[Zorrowannabe9]

yea i saw that cannon, looked nice.

[zeigs spud]

neeto cannon lol
that a bad camera or at night? the pic looks weird with the tints and colors.

[Zorrowannabe9]

the close-ups and the damage shots were done at night, or in my room so the lighting is a bit strange

[killagorrila99]

I'm thinking about making one of these. Any input?

[Zorrowannabe9]

find a good material for your diaphragm. The tire inner tube I used broke, which shot me with a paintball. I also suggest NOT using the T like I did, rather use a bushing and go to a smaller pipe diameter (maybe 1/2") then do the T to however many adapters you need (vent, fill, guage)