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Dual 3/4" QEV Copper Launcher!!

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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Ahh so so!!!
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Total votes : 57
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Unread postAuthor: SpudStuff » Tue Nov 28, 2006 11:42 pm

Wow that looks very nice. Clean soldering. Almost dosn't look like it is even soldered.
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Unread postAuthor: joannaardway » Wed Nov 29, 2006 3:34 am

spud-tom wrote:did you use two pistons? because there are two pipes leading to the barrel


The thing uses two QEVs in unison, so, yes, sort of.
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Novacastrian: How about use whatever the heck you can get your hands on?
frankrede: Well then I guess it won't matter when you decide to drink bleach because your out of kool-aid.
...I'm sorry, but that made my year.
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Unread postAuthor: Animal81182 » Thu Nov 30, 2006 3:29 pm

Yea it is soldered just took me ages to get it lookin real neat - that was very important to me!!!!

The cost - actual was around £40-50 but i got a lot of the fittings and pipe free

I reckon it would have set me back £100-150 easily as i have used 35m copper which the fittings average around £10 each and the pipe is £30-40 per length!!!

The QEV's i used because we can't get hold of sprinkler valves over in the UK - but they are actually more powerfull!!! - A 3/4" QEV is as powerfull if not more than a 1" Sprinkler valve!!!!
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Unread postAuthor: spud-tom » Thu Nov 30, 2006 11:48 pm

is a qev the same as a piston?
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Unread postAuthor: joannaardway » Fri Dec 01, 2006 6:55 am

Yes, in theory.

It's pre-made, and originally designed to operate pneumatic cylinders, but the theory of operation is identical.

It's more precisely made, so you can pilot them off almost anything. A small leak can fire these by accident - because they have no back flow whatsoever.
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Novacastrian: How about use whatever the heck you can get your hands on?
frankrede: Well then I guess it won't matter when you decide to drink bleach because your out of kool-aid.
...I'm sorry, but that made my year.
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Unread postAuthor: Animal81182 » Fri Dec 01, 2006 1:08 pm

Yes exactly as Joanne said - hey there how are you - where have you been!!!??? :D
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Unread postAuthor: spud-tom » Sat Dec 02, 2006 11:42 am

Thanks, that helped me a lot
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Unread postAuthor: squeaks » Sat Dec 02, 2006 3:35 pm

If I wanted to find a QEV on ebay or somewhere what would I type in as a search 'cause I haven't been able to find one.
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Unread postAuthor: Animal81182 » Sat Dec 02, 2006 4:32 pm

Try Quick exhaust valve - but to be honest i have only ever found really small bore QEV's on ebay!! - and they aint any cheaper!

Try pneumatic suppliers!
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Unread postAuthor: john bolton » Mon Dec 04, 2006 3:21 am

its all nice and shiny! if we get some copper and make some 1 inch barrel sealers ill make one.
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Unread postAuthor: joannaardway » Mon Dec 04, 2006 6:42 am

Animal hit the nail on the head - don't use eBay, unless you have a really odd size to get hold of.

I'm sure a helpful person will direct you to the Mcmaster part number... (I don't know it)

@Animal: I'm fine. Still living as normal - not dead yet, at least.
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Novacastrian: How about use whatever the heck you can get your hands on?
frankrede: Well then I guess it won't matter when you decide to drink bleach because your out of kool-aid.
...I'm sorry, but that made my year.
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Unread postAuthor: Animal81182 » Mon Dec 04, 2006 5:05 pm

Jolly good - I am thinking the ones on mcmaster are pretty expensive if they have any!! - i was thinking i have possiably read this before on another thread - but it is still worth a try!!!

@Joanne Glad to see you are still hangin in their - have you not got any ongoing projects at the mo????
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Unread postAuthor: joannaardway » Tue Dec 05, 2006 10:22 am

@ Animal: I have got some designs going at the moment. I'm not yet sure which of them to turn into reality.

Small funds and little time coupled with several hobbies and big ideas in all of them doesn't work well.
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Novacastrian: How about use whatever the heck you can get your hands on?
frankrede: Well then I guess it won't matter when you decide to drink bleach because your out of kool-aid.
...I'm sorry, but that made my year.
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Unread postAuthor: Animal81182 » Sun Dec 10, 2006 10:31 am

I am excactly the same - i oredered some stuff from Airlines so i could change the pilot on this one!!! - and get some QEV's for another project but they havent got any until the new year so i cancelled the order until their in to save on P&P - i am a bit gutted really as i can't fire it over the chrimbo hols!!!!
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Unread postAuthor: nicholai » Sun Dec 10, 2006 11:20 am

yeah copper is pretty spendy in the USA, i was looking at home depot the other day and it was almost $40 for a 10 footer of 1" copper pipe

oh yeah, nice cannon animal, kick ass craftsmanship. Thumbs up!
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