Search found 1595 matches

by iknowmy3tables
Wed Nov 17, 2021 1:28 pm
Forum: Ammo & Parts
Topic: Source for Thin wall 1.5" pipe
Replies: 5
Views: 647

Re: Source for Thin wall 1.5" pipe

Thanks for the suggestions folks I ended up buying a section of metric PVC here MECCANIXITY PVC Rigid Round Pipe 45.2mm ID 50mm OD 350mm Light Grey High Impact for Water Pipe,Crafts,Cable Sleeve https://www.amazon.com/dp/B09J14XH93/ref=cm_sw_r_apan_glt_fabc_6N8GEHY78V6YNQNN7PKY?_encoding=UTF8&psc=1 ...
by iknowmy3tables
Wed Nov 17, 2021 1:19 pm
Forum: Pneumatic Cannons
Topic: Designing a inline piston pressure regulator - Fluid statics math model
Replies: 19
Views: 1349

Re: Designing a inline piston pressure regulator - Fluid statics math model

I haven't accounted for friction that would require more information than I have access too. It would just involve adding a friction component to the equilibrium a freeze frame in time, one when it's fully open one when it's closed but it also involves an arbitrary increase in spring compression whe...
by iknowmy3tables
Tue Nov 16, 2021 11:36 pm
Forum: Pneumatic Cannons
Topic: Designing a inline piston pressure regulator - Fluid statics math model
Replies: 19
Views: 1349

Re: Designing a inline piston pressure regulator - Fluid statics math model

sorry I'm very late to provide any useful contribution, Statics class is a long time ago did a slightly different force analysis on your original regulator design and got basically the same force formula just phrased F0=(pi/4)*(p1(d1-d2)+p2d2) if that any reassurance also the pressures involved does...
by iknowmy3tables
Sat Oct 23, 2021 11:02 pm
Forum: Pneumatic Cannons
Topic: How far does it go!
Replies: 7
Views: 669

Re: How far does it go!

good news while it was fun to refresh my trigonometry and kinematic equations I found a projectile calculator online as soon as you enter an initial height time in flight and angle you should get a result https://www.omnicalculator.com/physics/projectile-motion based on your 16seconds at 45 degrees ...
by iknowmy3tables
Tue Oct 19, 2021 2:17 pm
Forum: Ammo & Parts
Topic: Source for Thin wall 1.5" pipe
Replies: 5
Views: 647

Source for Thin wall 1.5" pipe

I was testing some ping pong balls with a 1.5" PVC drain tee and discovered it had the perfect geometry to facilitate shooting a single ping pong ball at a time. In other words I found a tee that will work as a gravity fed hopper for a semi auto ping pong cannon. The problem is I need a loose fittin...
by iknowmy3tables
Wed Oct 13, 2021 10:00 pm
Forum: Pneumatic Cannons
Topic: A tale of two valves
Replies: 6
Views: 2270

Re: A tale of two valves

I stopped by my friend's place made a simple test shooting shuttlecocks made from bottles at 60psi vertically
by iknowmy3tables
Wed Oct 13, 2021 9:28 pm
Forum: Combustion Cannons
Topic: Cheap spark generator
Replies: 0
Views: 259

Cheap spark generator

Hey guys just a product heads up for a high voltage spark source. These days I notice Amazon won't ship cheap stunguns to areas even adjacent to areas with stungun restrictions, but I got mine under $6 this is cheaper, they go by a lot of names but look the same. It work's great will runs on an sour...
by iknowmy3tables
Wed Oct 13, 2021 9:06 pm
Forum: Pneumatic Cannons
Topic: Electro-pneumatic Eclipse with Air-burst rounds
Replies: 13
Views: 1117

Re: Electro-pneumatic Eclipse with Air-burst rounds

You mention non-lethal are these gentle enough for say mil-sim or surprise gender-reveal parties
by iknowmy3tables
Wed Oct 13, 2021 4:14 pm
Forum: Pneumatic Cannons
Topic: Electro-pneumatic Eclipse with Air-burst rounds
Replies: 13
Views: 1117

Re: Electro-pneumatic Eclipse with Air-burst rounds

Very impressive technology, what kind of application do you have in mind for these?
by iknowmy3tables
Wed Oct 13, 2021 4:08 pm
Forum: Pneumatic Cannons
Topic: Latest Eclipse Defense 37mm Pneumatic
Replies: 8
Views: 823

Re: Latest Eclipse Defense 37mm Pneumatic

Good to see more of your fine work, last time I saw your work was a video with jamie hyneman. Are you yourself active on any other platforms?
by iknowmy3tables
Mon Oct 11, 2021 11:14 am
Forum: Pneumatic Cannons
Topic: opinions needed on concept
Replies: 4
Views: 543

Re: opinions needed on concept

I see what you mean requiring positive pressure to open prevents the valve from opening every time you disconnect the air source, just need to machine more air seals.
by iknowmy3tables
Thu Oct 07, 2021 3:57 pm
Forum: Pneumatic Cannons
Topic: opinions needed on concept
Replies: 4
Views: 543

Re: opinions needed on concept

That's an interesting use of an air cylinder, but you really have the same effect from a QEV or a more common homemade piston valve. And as long as the air cylinder internal diameter is greater than the barrel diameter it should work fine. But I don't really see an advantage to using an air cylinder...
by iknowmy3tables
Wed Oct 06, 2021 3:04 pm
Forum: SpudFiles Discussion
Topic: Feedback for an idea I just had
Replies: 10
Views: 754

Re: Feedback for an idea I just had

Could you make something like a thick 1"+ diameter threaded rod longer than it needs to be, then the end user can saw it to length. I think spacing as low as 1" makes sense, for barrels 1.5" PVC and 2" PVC, chambers 3" and 4"
by iknowmy3tables
Wed Oct 06, 2021 2:46 pm
Forum: Pneumatic Cannons
Topic: Impulse Water Cannon any idea???
Replies: 3
Views: 523

Re: Impulse Water Cannon any idea???

Oh wow that's very different from what I guessed. It looks like a regular pneumatic cannon but it lets water in the barrel, it seems like they even aim it up to prevent the water from spilling out between shots. Besides making a fast opening cannon, put something on the muzzle to help create a vorte...
by iknowmy3tables
Wed Oct 06, 2021 11:15 am
Forum: BB, Airsoft, and Pellet Guns
Topic: What is 0000 buckshot used for?
Replies: 2
Views: 362

Re: What is 0000 buckshot used for?

Most people settle on 00 as the go to buckshot for defense because each pellet is reasonably effective, but some people value quantity as a quality of it's own. In Vietnam special forces favored 000 buck as the go to buckshot for the better coverage of the jungle, they also sometimes had duckbill ch...