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Elephant Rifle mk1 and mk2

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: django » Sat Aug 10, 2013 8:00 am

Damn I gotta make one of these, I already have a Qev just need the other parts. I want to incorporate a Bolt action feeder but ive still not managed to make one that seals airtight as I don't have a Lathe..

I think I'll use a T Fitting on the Bottom of the Blowgun Handle instead of a 90 and screw the Schrader valve into the rear facing port of the T Fitting
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Re: Elephant Rifle mk1 and mk2

Unread postAuthor: kidtriffer44 » Sun Sep 02, 2018 3:50 am

Hi, just have a few question.
1. what is the purpose of the tube?
2. is there any spring installed behind the qev piston?
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Re: Elephant Rifle mk1 and mk2

Unread postAuthor: wyz2285 » Sun Sep 02, 2018 6:41 am

Blowguns holds higher pressure from the rear than the front. So if you seal the front and channel the air to the back you can use higher pressure in your launcher.
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Re: Elephant Rifle mk1 and mk2

Unread postAuthor: farcticox1 » Sun Sep 02, 2018 7:50 am

To actuate or trigger a QEV you need to release air from the P port, that pipe is connected to the P port and dumps air through the blow gun from the bottom upwards, For a single shot (dumps all chamber at once) the output of the blowgun could be blocked where it joins the T to the QEV and a small bleed hole drilled to release that pilot air when the trigger is pulled, that's how I would do it. In the first picture there is a schrader valve on the P port side, if that is the fill valve then no spring would be needed in the QEV, that is how they are designed to be used.

QEV 3.jpg


That's how this works

SS (3).jpg


Multiple shots get more complicated hence the extra valves to release small amounts of air from the P port.
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