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3/4" QEV PVC cannon! (+nearly finished coax teaser pics

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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3/4" QEV PVC cannon! (+nearly finished coax teaser pics

Unread postAuthor: ALIHISGREAT » Thu Aug 28, 2008 7:53 am

finally got round to nearly finishing my first cannon! :lol:

specs

1m 3/4" PVC barrel
~80cm 1.5" chamber
3/4" QEV
blowgun pilot
good for about 120psi (pipe rated to 160)
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Attachments
DSCF0465.JPG
full view
DSCF0465.JPG (39.8 KiB) Viewed 2208 times
DSCF0466.JPG
valves
DSCF0466.JPG (38.13 KiB) Viewed 2208 times
DSCF0467.JPG
front
DSCF0467.JPG (35.78 KiB) Viewed 2208 times
DSCF0468.JPG
silencer fixed to 22mm pvc inside 3/4" Pvc
DSCF0468.JPG (33.92 KiB) Viewed 2208 times
DSCF0469.JPG
inside of silencer
DSCF0469.JPG (35.83 KiB) Viewed 2208 times
DSCF0476.JPG
My dads TVR (i was in the garage with my camera and... well it was just begging to be photographed and shown off!)
DSCF0471.JPG
my copper coax
DSCF0471.JPG (37.99 KiB) Viewed 2203 times
Last edited by ALIHISGREAT on Mon Sep 01, 2008 5:51 pm, edited 1 time in total.
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Unread postAuthor: starman » Thu Aug 28, 2008 8:07 am

Some pretty bad "bowage" on your gray barrel there. Why don't you shorten your stand-off and level it out?

Also, you must be left handed.... :?:
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Unread postAuthor: ALIHISGREAT » Thu Aug 28, 2008 8:28 am

yeah it is pretty bent, i need to get some 22mm copper to put it over then i'll see if heating it will make it retain the straightnesss (although i doubt it will)

and i'm not left handed, the blowgun is like that because there is not quite enough room for it under the chamber so i need to shorten the lever on the blowgun (although its not uncomfortable to shoot)
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Unread postAuthor: starman » Thu Aug 28, 2008 8:34 am

ALIHISGREAT wrote:yeah it is pretty bent, i need to get some 22mm copper to put it over then i'll see if heating it will make it retain the straightnesss (although i doubt it will)


No need to do all that...just shorten your stand-off under the tee at the end of the barrel and tie it back down.
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Unread postAuthor: ALIHISGREAT » Thu Aug 28, 2008 9:33 am

it wouldn't work because the barrel is surprisingly flexible and aqlso i haven;t glued the tee on.
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Unread postAuthor: MaxuS the 2nd » Thu Aug 28, 2008 10:32 am

I think what starman is trying to say is that if you were to shorten the length of the pipe of the barrel support then the barrel would not bow. Starman is correct.
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Unread postAuthor: ALIHISGREAT » Thu Aug 28, 2008 10:44 am

no because the pipe has always been bent so its nothing to do with the barrel support and it wouldn;'t work anyway unless i glued it and i don;t want to.
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Unread postAuthor: Sticky_Tape » Thu Aug 28, 2008 10:58 am

You know if you take that brass think out of the end of the blowgun you will get better preformance.
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You can tell how awesome a cannon is by the pressure used.
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Unread postAuthor: MaxuS the 2nd » Thu Aug 28, 2008 11:49 am

ALIHISGREAT wrote:no because the pipe has always been bent so its nothing to do with the barrel support and it wouldn;'t work anyway unless i glued it and i don;t want to.


And what I'm trying to say is that if you were to cut that length of pipe down a little bit, then it would hold the barrel straight.
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Unread postAuthor: ALIHISGREAT » Sat Aug 30, 2008 11:23 am

yes it would IF I GLUED THE TEE ON WHICH I'M NOT GOING TO DO :x
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Unread postAuthor: MaxuS the 2nd » Sat Aug 30, 2008 11:59 am

Why not? This would solve your problem..
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Unread postAuthor: ALIHISGREAT » Sat Aug 30, 2008 5:21 pm

because then i wouldn't be able to swap out barrels, if i want a longer or shorter or bigger or smaller....
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Unread postAuthor: jackssmirkingrevenge » Sun Aug 31, 2008 11:42 pm

Nice car!

:D

*ahem* yes, good effort on the launcher, damage pics!
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Unread postAuthor: ALIHISGREAT » Mon Sep 01, 2008 2:44 am

jackssmirkingrevenge wrote:Nice car!

:D

*ahem* yes, good effort on the launcher, damage pics!


you are talking about the red monster truck in the background of the TVR pic right? :lol:

oh and yeah, well i changed the configuration to a BTB sawn off shape (which is what it was origionally but then i changed it, but i prefer the sawn off shape 8) ) and i'm sure i can find something to shoot at, i was thinking a melon or something with a 12g co2.....
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