Search found 46 matches

by Slauma
Fri Jun 03, 2011 9:43 am
Forum: Pneumatic Cannons
Topic: Blowgun max 30psi?
Replies: 16
Views: 2702

Is that a chunk of granite countertop jack? What's it rated for? I don't believe I'm familiar with the National Stone Thread standards.
by Slauma
Wed Jun 01, 2011 9:08 pm
Forum: Pneumatic Cannons
Topic: CQEV Cannon
Replies: 7
Views: 3400

Took some advice and ditched the second QEV, now I suppose I'll have to think of a new name :| Performance seems comparable (don't really know, haven't done any quantitative tests) although the speed at wich the trigger (DCV) is operated now has a relatively drastic effect on the power of the shot, ...
by Slauma
Mon May 30, 2011 11:00 pm
Forum: Pneumatic Cannons
Topic: CQEV Cannon
Replies: 7
Views: 3400

I've seen that air cylinder setup work before. The only air cylinder I have right now is double acting (no spring return). I was thinking one possibility might be to connect a small air reservoir to one side to work like an air spring. Or I could just make it spring return by attaching a spring to t...
by Slauma
Mon May 30, 2011 5:29 pm
Forum: Pneumatic Cannons
Topic: CQEV Cannon
Replies: 7
Views: 3400

CQEV Cannon

Here's a cannon I've been tinkering with for a while. It uses not one, but two QEVs, so I've dubbed it the CQEV (Cascading QEV) cannon. It's probably not the most efficient use of two QEVs but I've been accumulating parts for a while now and had them lying around. Here the specs Main Valve: 3/4" Del...
by Slauma
Sat Jul 10, 2010 11:49 pm
Forum: Pneumatic Cannons
Topic: 12 bore HPA coaxial
Replies: 60
Views: 8992

How well do the CO2 cartridges fly? tumble? I've seen others use them before, I think I might follow suit with my next build. They're uniform, destructive, disposable, and cheap (or free if you look hard enough). Seems almost too good to be true so me thinks there must be a catch; maybe a little lac...
by Slauma
Fri Jul 09, 2010 12:18 pm
Forum: Pneumatic Cannons
Topic: Feasible as BHV
Replies: 11
Views: 1011

This is basically the design used in most blowguns I believe.
by Slauma
Fri Jul 09, 2010 12:15 pm
Forum: Pneumatic Cannons
Topic: Wii Nunchuck as Trigger!
Replies: 11
Views: 1469

I can still see the video. Awesome little project, I wish I knew enough or had the time to learn enough about electronics to do something like this. If it were me though I would have done something like suggested above; why not use the button on the nunchuck to fire the cannon? It would give it a fe...
by Slauma
Tue Jul 06, 2010 7:37 pm
Forum: General How-To & Discussion
Topic: PVC layered in kevlar/carbon fiber?
Replies: 18
Views: 7378

I've ordered some carbon fiber cloth and epoxy off ebay to try this with. Carbon fiber Epoxy Plans are still in the works but I'll post a link in this thread once some more progress has been made. EDIT: Accidently linked to medium viscocity, I ordered low viscocity epoxy. Link is now corrected
by Slauma
Sun Jun 20, 2010 11:13 am
Forum: Pneumatic Cannons
Topic: FIM-92A Stinger missile build
Replies: 24
Views: 3389

I'm pretty sure you need two regulators to get HPA low enough for PVC... JSR uses a standard paintball reg that reggs down to 450 psi... from that point you can either reg down to 125 or follow JSR's advice and use a QEV + metal chamber Just for a little clearing up, it's entirely possible to reg 4...
by Slauma
Fri Jun 04, 2010 10:00 pm
Forum: Ammo & Parts
Topic: Epoxy casting/use
Replies: 21
Views: 2911

Right on, the current design includes a ~6mm gap between the fittings and the side walls of the enclosure. This will allow epoxy to pretty much encase the fittings, except for the front and back. Would you consider this sufficient without CF? It's always an option though. Hell, for 10 bucks, I might...
by Slauma
Thu Jun 03, 2010 9:28 pm
Forum: General How-To & Discussion
Topic: PVC layered in kevlar/carbon fiber?
Replies: 18
Views: 7378

Carbon fiber cloth and thread are fairly available to hobbyists at less than outrageous prices. Check out ebay. It may end up costing a bit, but if it actually gives a considerable increase in strength it could produce a cannon with excellent strength/weight ratio. I think it would be worth it. Not ...
by Slauma
Thu Jun 03, 2010 5:39 pm
Forum: Ammo & Parts
Topic: Epoxy casting/use
Replies: 21
Views: 2911

So here's the plan as of now. I've modified the elbow and the tee so they have a tight fit. After thinking about it, I've decided not to use a temporary mold to cast the epoxy in, rather construct an encasing out of pvc and simply fill it with epoxy and seal it. Here's a little sketchup I did to giv...
by Slauma
Tue Jun 01, 2010 8:50 pm
Forum: Ammo & Parts
Topic: Epoxy casting/use
Replies: 21
Views: 2911

Slauma if you look closely at Superna, I did screw up on the allignment of the 45* elbows resulting in the chamber and barrel not being parallel, but it is very subtle when the barrel is on. Mine wasn't too bad either. Actually when I put hose clamps around the barrel and chamber for the barrel sup...
by Slauma
Tue Jun 01, 2010 8:12 pm
Forum: Ammo & Parts
Topic: Epoxy casting/use
Replies: 21
Views: 2911

Have a look at this project . Precisely the man I'm looking for apparently. :D Very helpful, thank you. I'm gonna go ahead and start modifying the fittings to try this I think. Did you use this stuff you linked to on ebay on that cannon? Do they make special high pressure epoxies? The only thing I'...
by Slauma
Mon May 31, 2010 10:50 pm
Forum: Ammo & Parts
Topic: Epoxy casting/use
Replies: 21
Views: 2911

That's who it was I had seen jor2daje, thanks for the link. Without doing the epoxy, get a street elbow then use 45 degree elbows to make the chamber higher like I did on Superna. This is actually the last upgrade I made to my most recent gun. I personally just don't like it as much this way, it sti...