Search found 498 matches

by jhalek90
Mon Aug 19, 2013 6:27 pm
Forum: General How-To & Discussion
Topic: Beautiful High speed video I found: the physics of pressure
Replies: 2
Views: 539

thanks! watching the full video now.
by jhalek90
Wed Aug 07, 2013 4:34 pm
Forum: General How-To & Discussion
Topic: Beautiful High speed video I found: the physics of pressure
Replies: 2
Views: 539

Beautiful High speed video I found: the physics of pressure

When i found this, i logged in just to share it with you all :D
enjoy.



[youtube][/youtube]
by jhalek90
Fri May 24, 2013 7:46 pm
Forum: Pneumatic Cannons
Topic: Basic Nerf Cannon Help
Replies: 44
Views: 2400

Cut a slit in a length of 1/2'' PVC, then that will open slightly larger, side it over the cpvc and keep the cut side of the pvp opposite of the breech.

always works for me.

Nerf darts require so little air, this will work just fine.
by jhalek90
Thu Jun 07, 2012 12:47 pm
Forum: General How-To & Discussion
Topic: penumatic car launcher.
Replies: 4
Views: 394

its actually a large tank of nitrogen, a 2'' ball valve, the projectile is a piston moving the car.

[youtube][/youtube]
by jhalek90
Thu Jun 07, 2012 12:36 pm
Forum: General How-To & Discussion
Topic: penumatic car launcher.
Replies: 4
Views: 394

penumatic car launcher.

Found this on youtube, thought i would share.

[youtube][/youtube]
by jhalek90
Thu May 31, 2012 8:41 am
Forum: Pneumatic Cannons
Topic: Sprinkler Valve Honking When Opening and Extremely Poorly
Replies: 7
Views: 1073

how did you plug the pilot hole with your finger at 60+ psi???

Im guessing you are doing something a little bit wrong...
by jhalek90
Sun May 20, 2012 6:56 pm
Forum: Off-Topic Hobbies
Topic: Hexagonal bullet find
Replies: 9
Views: 1679

by jhalek90
Fri May 18, 2012 12:39 pm
Forum: Pneumatic Cannons
Topic: Concerns: QEV And Blowgun
Replies: 24
Views: 2082

Unsurprisingly, I concur. Though I don't know if eBay slide valves can take 300 psi without leaking, unless you go for the paintball ones. Not in my experience. I have used one at 200psi, and it developed a small leak. Also starts to get very hard to actuate at anything over 150 psi. no experience ...
by jhalek90
Wed May 16, 2012 1:18 pm
Forum: Pneumatic Cannons
Topic: Hammer pilot valve with QEV
Replies: 7
Views: 1751

Image
by jhalek90
Wed Apr 25, 2012 3:32 pm
Forum: Pneumatic Cannons
Topic: 4 inch piston
Replies: 15
Views: 1527

also, a 3'' dome end cap fits in 4'' schedule 40 PVC perfectly, and i have used one with some success. Just bolt a big steel washer, and a rubber gasket into the inside of the dome, and you have a perfect piston for a 3'' porting cannon made in a 4'' T. just be sure to use an really good bumper. i u...
by jhalek90
Wed Apr 25, 2012 3:26 pm
Forum: General How-To & Discussion
Topic: shut-off valve suppressor
Replies: 80
Views: 12420

My worry is that it would not be picked up by the gasses at all.
maybe i don't quite understand the physics, but is this not exactly how cloud BBMGs work?

i suppose cloud chambers have more time to allow the air to act on the BB... but the concept is the same right? Bernoulli principle?
by jhalek90
Thu Apr 12, 2012 2:10 pm
Forum: Pneumatic Cannons
Topic: 2'' porting piston cannon. video. Built fot HPA
Replies: 32
Views: 4004

[youtube][/youtube]
by jhalek90
Tue Apr 10, 2012 9:44 am
Forum: Pneumatic Cannons
Topic: 2'' porting piston cannon. video. Built fot HPA
Replies: 32
Views: 4004

Nice, I had missed this! Needs some better projectiles though ;) Any relatively cheap ideas? I would love to shoot something with more penetration power. (oh god.... here come the jokes.) EDIT: in the second video, you can see the projectile i was shooting, in the first set of damage pics. It is a ...
by jhalek90
Sat Apr 07, 2012 7:22 am
Forum: Pneumatic Cannons
Topic: 2'' porting piston cannon. video. Built fot HPA
Replies: 32
Views: 4004

High-PSI wrote:Volume is calculated as the length times radius squared.

1,000 ci is typical for a tank of that type. My scuba tank is 1,085 ci.

Matt
Ahh, ty. In my edited post above, i did the math. 1000 ci seems to be correct.