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HPVR -First Copper Rifle/Cannon

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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Unread postAuthor: mopherman » Thu Dec 20, 2007 2:44 pm

cwazy1 wrote:
but yeah so can anyone answer my question post above^^ on the teflon tape type??

They both work, just use a lot.
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Unread postAuthor: cwazy1 » Thu Dec 20, 2007 2:51 pm

yeah okay, when i screwed them on, i would only get the thread in like 3 rotations, thats prolly not enough right??
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Unread postAuthor: Ragnarok » Thu Dec 20, 2007 3:27 pm

The gas variety is indeed the thicker yellow-ish type, and contrary to what mopherman says, there is an important difference.

Also, don't expect more than about 1100 fps from air, regardless of the pressure or valve. GGDT gives some pretty odd results around the sound barrier.
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Unread postAuthor: mopherman » Thu Dec 20, 2007 4:26 pm

Ragnarok wrote:The gas variety is indeed the thicker yellow-ish type, and contrary to what mopherman says, there is an important difference.

I never said there wasn't a difference, just that they both work. What is this important difference you speak of anyway?
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Unread postAuthor: Ragnarok » Thu Dec 20, 2007 5:01 pm

@mopherman: I've used both, and I always get less leaks with the gas variety.
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Unread postAuthor: cwazy1 » Thu Dec 20, 2007 5:03 pm

hmm, maybe i'll have to go get some more of that stuff. . . . i went and bought a bottle of pipe paste, i'll see how that works out.
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Unread postAuthor: cwazy1 » Thu Dec 20, 2007 10:36 pm

ok so i fixed all the leaks and its good now, ...heres a pic of it with a qev
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Unread postAuthor: ALIHISGREAT » Sun Jan 06, 2008 4:51 pm

sorry about bumping this almost dead topic :wink: but i have a question about the valve, how did you fit it in the tee and have good travel because i noticed you have a threaded fitting straight into the tee so i'm confused about how you fit it in with good travel :?

thanks Alasdair.
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Unread postAuthor: MaxuS » Sun Jan 06, 2008 5:31 pm

It's a threaded tee, that's it..
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Unread postAuthor: ALIHISGREAT » Sun Jan 06, 2008 5:46 pm

MaxuS wrote:It's a threaded tee, that's it..


yes but i'm wondering how much space is left for piston travel when the threaded reducer is in the tee?
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Unread postAuthor: DYI » Sun Jan 06, 2008 6:00 pm

Well, the barrel is .5", so the piston should travel anywhere between .25" and .5". There seems to be ample room for travel.
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Unread postAuthor: ALIHISGREAT » Sun Jan 06, 2008 6:23 pm

DYI wrote:Well, the barrel is .5", so the piston should travel anywhere between .25" and .5". There seems to be ample room for travel.


ok i see to have got t into my head that pistons need to travel miles to be effective despite knowing that they only need 1/4 of the bore :happy8:
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Unread postAuthor: cwazy1 » Sun Jan 06, 2008 7:09 pm

lol yeah theres like .5" of travel inside the tee.

if anyone is interested, heres an updated picture.

http://img152.imageshack.us/my.php?image=dscn0035gn6.jpg
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Unread postAuthor: ALIHISGREAT » Mon Jan 07, 2008 4:26 am

cwazy1 wrote:lol yeah theres like .5" of travel inside the tee.

if anyone is interested, heres an updated picture.

http://img152.imageshack.us/my.php?image=dscn0035gn6.jpg


it looks pretty cool woth the scope and is that a union i can see on the barrel?
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