Search found 21 matches

by Xenophile
Thu Oct 15, 2020 5:46 pm
Forum: Pneumatic Cannons
Topic: Yet another QEV and 3/2 valve cannon
Replies: 3
Views: 295

Re: Yet another QEV and 3/2 valve cannon

Thanks JSR, I'm glad you like it! I've completed a gravity fed magazine ( 10 shot capacity for .30 caliber shot) which is working fairly well, but I am having some issues with double feeding. Air gun overview .jpg I'm using a "detent" system with neodymium magnets to keep the shot in place, but this...
by Xenophile
Sat Sep 19, 2020 6:09 pm
Forum: Pneumatic Cannons
Topic: Yet another QEV and 3/2 valve cannon
Replies: 3
Views: 295

Yet another QEV and 3/2 valve cannon

Overview of FS resized.jpg My latest creation. As the title suggests, I using a QEV and 3 position 2 way valve with a 300 psi input from a regulated HPA paintball tank. I have two different barrels, one for 3/8 inch (9.5 mm) steel shot and another for .30 caliber steel shot. The 3/8 inch barrel is ...
by Xenophile
Sun Jul 19, 2020 12:02 pm
Forum: Pneumatic Cannons
Topic: MJVO-3 venting air from the sides
Replies: 6
Views: 647

Re: MJVO-3 venting air from the sides

Thank you for getting back to me. I appreciate all of your thoughts! I've independently tested my QEV using a slide valve, and it functions as expected; properly filling the secondary chamber and releasing air out the barrel. I even added more lubricant to the QEV to ensure the cylinder was properly...
by Xenophile
Fri Jul 17, 2020 5:36 pm
Forum: Pneumatic Cannons
Topic: MJVO-3 venting air from the sides
Replies: 6
Views: 647

MJVO-3 venting air from the sides

Hello Spudfiles! I've been working on a new cannon which uses a QEV piloted by a Clippard MJVO-3. Unfortunately during my initial pressure test at 100 psi, when I fired the cannon, air vented from the two holes on either side of the MJVO-3 instead of into the QEV and out the barrel as intended. The ...
by Xenophile
Sat Feb 01, 2014 2:09 pm
Forum: Pneumatic Cannons
Topic: The Goblin; a QEV paintball gun
Replies: 5
Views: 1370

Re: The Goblin; a QEV paintball gun

Believe it or not, the pipe I'm using as a barrel has an almost perfect seal with very little blow-by. I think its a threaded pipe for a sprinkler. I have not yet tested it on a full tank of CO2, but I should get around to it soon. Prototyping uses a lot of gas! I'm curious about how to include a bl...
by Xenophile
Fri Jan 31, 2014 7:07 pm
Forum: Pneumatic Cannons
Topic: The Goblin; a QEV paintball gun
Replies: 5
Views: 1370

The Goblin; a QEV paintball gun

photo (4).JPG Hello spudfiles. I have recently created perhaps my greatest pneumatic cannon to date! I call the beast "The Goblin". As far as the specifications go, I run the gun at around 90-120 psi using a Palmer regulated paintball CO2 tank. I'm using a standard QEV and slide valve set up to ena...
by Xenophile
Sun Jun 03, 2012 5:12 pm
Forum: Combustion Cannons
Topic: Having trouble getting a tennis ball mortar to shoot
Replies: 5
Views: 1082

Having trouble getting a tennis ball mortar to shoot

Hey guys. I have recently constructed a tennis ball mortar out of 3" diameter PVC pipe with two pringles cans lining the inside to act as baffles as detailed in the tennis ball mortar plans of the book "Backyard Ballistics". I use lighter fluid as my propellant an a piezoelectric lighter or long han...
by Xenophile
Tue Jan 10, 2012 6:51 pm
Forum: BB, Airsoft, and Pellet Guns
Topic: Help with an inline vortex BBMG
Replies: 15
Views: 1739

Thanks guys! I have reconsidered the possibility of running on a compressed air paintball tank assuming that I can find a place to refill it with compressed air. Would a sporting goods store (Where I would buy the tank) offer services where I could refill my tank? Does anyone here have experience ru...
by Xenophile
Mon Jan 09, 2012 6:36 pm
Forum: BB, Airsoft, and Pellet Guns
Topic: Help with an inline vortex BBMG
Replies: 15
Views: 1739

Thanks for the help guys! My new barrel is about a foot long and has a tighter inner diameter. Something I have been wondering about though is how to create a simple homemade hop-up. I hear the backspin generated from such would increase my range and accuracy. How would I go about doing this?
by Xenophile
Sun Jan 08, 2012 9:24 pm
Forum: BB, Airsoft, and Pellet Guns
Topic: Help with an inline vortex BBMG
Replies: 15
Views: 1739

Yes the tank is still PVC, but I have a safety cutoff switch built into the air compressor. I'm interesting in a setup that would still use high pressure air for the propulsion system. I was thinking of maybe getting one of those high pressure metal or carbon fiber paintball tanks that can take abou...
by Xenophile
Sun Jan 08, 2012 6:54 pm
Forum: BB, Airsoft, and Pellet Guns
Topic: Help with an inline vortex BBMG
Replies: 15
Views: 1739

OK, I now have a working gun that I have upgraded by installing a longer metal barrel, and a new backpack set up with an air tank constantly being charged by a 12 volt air compressor powered by a rechargeable battery. I have also installed a pressure gauge between the blowgun trigger and gun so I ca...
by Xenophile
Tue Dec 06, 2011 6:24 pm
Forum: BB, Airsoft, and Pellet Guns
Topic: Flywheel driven automatic airsoft gun
Replies: 17
Views: 3591

Wow! I'm glad you guys have interest in this. Also thanks for posting those fascinating links to the PEST and the dread gun, those are very similar to what I have in mind. So if I wanted to build a device like what I have described, where should I begin?
by Xenophile
Sun Dec 04, 2011 11:23 pm
Forum: BB, Airsoft, and Pellet Guns
Topic: Flywheel driven automatic airsoft gun
Replies: 17
Views: 3591

Flywheel driven automatic airsoft gun

So I had this idea for a cannon that worked by having a small wheel driven by a motor the spun in a small groove in the barrel propelling the ammunition out at a him velocity. I was wondering if such a device would work as I think it would be cool to attempt to build one. It works in a similar fashi...
by Xenophile
Fri Oct 14, 2011 6:44 pm
Forum: BB, Airsoft, and Pellet Guns
Topic: Help with an inline vortex BBMG
Replies: 15
Views: 1739

Great news guys! I fixed the problem on my own. It turned out I was simply adding too much ammunition to my gun, which resulted in the inability for agitation to be reached, and in turn, no venturi effect. It works great now and fires about 100 rounds per second! Thank you for the feedback! I will p...
by Xenophile
Sun Aug 21, 2011 2:20 pm
Forum: BB, Airsoft, and Pellet Guns
Topic: Help with an inline vortex BBMG
Replies: 15
Views: 1739

Help with an inline vortex BBMG

Hey, I've recently been having trouble with my BBMG with regards to getting it to fire. I pump the air chamber I have constructed out of pressure rated PVC pipe up to 120 PSI through a shraeder valve I have installed in one of the end caps of the pressure chamber, but when I pull the trigger of my b...