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MyModGun....The "Hipster"

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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MyModGun....The "Hipster"

Unread postAuthor: jeepkahn » Sat Feb 28, 2009 7:50 pm

At least the chamber anyway... I've got 6 barrels that fit on this...

I call it the hipster cause I shoot from the hip with this, normally lobbing heavy stuff...

It's a Humphreys qev piloted 4"x24" toolie chamber, with 2" locking camlocks allowing 5 second barrel swaps...

The handle is the front bumper from a 4wheeler, the strap I built myself(who needs to BUY large clamps)...

The barrels are nothin' special but they are: 3"x 6ft(will launch a 32oz monster can well over a hundred yards filled with water, and no wadding), 2"x 10ft (will launch 10oz missils 1/4 mile), 1.5"x 66" (will shoot a water filled pingpong ball 1/4 mile), 2.5"x5ft (tennis balls go byebye), 2.5"x 2ft for playing fetch with the dogs using tennis balls...
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Attachments
modgununder.jpg
showing the "clamping portion", left the tag ends long as a base when not shooting.
modgunhandle.jpg
showing my handiwork of fabbing a clamp with mounting tabs....
modgunpilot.jpg
showing the pilot setup, the humphrey qev is so sensitive and quick you have to be carefull when removing the fill hose from the schrader, the schrader will pilot the humphreys...
modgun.jpg
overall pic of the modular chamber..
layed out to shoot heavy stuff from large barrels...hence the orientation of the pilot sprayer and need of substansial handle.

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Unread postAuthor: SpudsMcGee » Sat Feb 28, 2009 7:54 pm

Cool.... Damage Pics please.
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Unread postAuthor: jeepkahn » Sat Feb 28, 2009 8:04 pm

SpudsMcGee wrote:Cool.... Damage Pics please.


the next warm day I've got lot's of stuff stored up to DAMAGE... :twisted:
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Unread postAuthor: rp181 » Sat Feb 28, 2009 8:11 pm

Nice. Hows the weight balance?
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Unread postAuthor: jeepkahn » Sat Feb 28, 2009 8:15 pm

rp181 wrote:Nice. Hows the weight balance?


Quite well, except with the 2"x10ft barrel, and the 3"x 6ft barrel, but with the layout it's still quite easy to handle and fire accurately...

I might also make a GB barrel for it, and a 1" by 6ft steel or aluminum barrel as well...
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Unread postAuthor: Brian the brain » Sun Mar 01, 2009 4:52 am

Great work and great design.
Do you feel the toolies piston is improving performance by allowing the inline flow?
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Unread postAuthor: Sticky_Tape » Sun Mar 01, 2009 8:33 am

Not to be an annoyance but I searched the wiki yet I don't know what a toolies piston is does anybody have I diagram I would appreciate it. This cannon looks really great but I don't believe tennis balls would go bye bye because of their weight.
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You can tell how awesome a cannon is by the pressure used.
http://www.spudfiles.com/forums/high-pr ... 12803.html
xnt rnm ne z ahtbg
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Unread postAuthor: jeepkahn » Mon Mar 02, 2009 4:19 pm

It seems like the toolie design does indeed perform better than a standard coax, I also made a "velocity stack" at the outlet end of the chamber(inside the chamber of course)... When launching projectiles with almost identical weights/size/shape, as my gb cannon, this one actually bypasses the gb guns distance, even with a smaller volume chamber and shorter barrell....

When I say tennis balls go byebye, I don't mean outta sight, but using tractor supply tuff balls(tennis balls made heavier duty for dog use) 200+ yards is no prob, which is very good for a furry sphere... I haven't injected one full of water yet to see how much farther it'll go...
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Attachments
edit_153.gif
this is a toolie, I actually put a longer and radius taper into the endcap than what this diagram shows...
edit_153.gif (4.96 KiB) Viewed 1484 times

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Unread postAuthor: Sticky_Tape » Mon Mar 02, 2009 4:59 pm

Oh yeah I thought that's what a toolie valve looked like.
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You can tell how awesome a cannon is by the pressure used.
http://www.spudfiles.com/forums/high-pr ... 12803.html
xnt rnm ne z ahtbg
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Unread postAuthor: jeepkahn » Tue Mar 03, 2009 9:45 am

Just for poops and giggles, I made a 10' long 1" barrel for it, way overkill on the chamber/barrel sizing, but I want to see how far and fast I can shoot a c battery or a superball... I'll prolly end up shooting this barrel a coupla times and then cannabilize about 6 ft of it for smaller coaxs, I'm getting lots of requests for them...
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Unread postAuthor: jeepkahn » Sat Mar 14, 2009 2:54 pm

Kicking a dead topic....

Actually, While reading and research on Cv's and such I think I've figured out where the performance increase for the toolie comes from versus a coaxial.... Reading D-Halls ggdt wiki, I found the formula for calculating Cv, and If I'm correct in assuming that a toolie will flow similar to a burst disc, then a toolie style valve will flow 33% more than a coax valve of the same size... However, the formula d listed is just an approximater...So it could be off slightly...
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Unread postAuthor: MaxuS the 2nd » Sat Mar 14, 2009 7:15 pm

If you put a check valve inbetween the schrader and tee then you wouldn't have the problem of the valve piloting when you take the pump off.
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Unread postAuthor: jeepkahn » Mon Mar 16, 2009 4:48 pm

MaxuS the 2nd wrote:If you put a check valve inbetween the schrader and tee then you wouldn't have the problem of the valve piloting when you take the pump off.


FACEPALMHEADDESK!!!! Duh, Thanx for that, sometimes the obvious things evade me, lol, I wanted to stay away from ball valves for aesthetic reasons, but check valve just went whoosh over my head... :wink:
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