Search found 137 matches

by Anatine Duo
Fri Feb 14, 2020 12:44 pm
Forum: Ammo & Parts
Topic: Low-friction/Specialty Ball Valves?
Replies: 10
Views: 227

Re: Low-friction/Specialty Ball Valves?

I've noticed that variability also. I wonder what that is? Deformation of the seal that creates a detente? Temperature? I play with the valves at the building center and notice that new ones are often very stiff. My 3/4" ball valve gun had a heavy hammer driven by bungees that easily overcame openin...
by Anatine Duo
Tue Jan 21, 2020 12:42 pm
Forum: Pneumatic Cannons
Topic: compact precision launcher
Replies: 3
Views: 222

Re: compact precision launcher

Stain is drying on the stock now. I'm going for something like... https://atlantic-firearms-prod.s3.amazonaws.com/media/sylius_shop_product_original/product/kel-tec-rbd-survival-223-rifle-11.jpg but more plant based, sustainable, carbon neutral and stuff. Also better trigger which isn't saying much ...
by Anatine Duo
Tue Jan 21, 2020 12:21 pm
Forum: Ammo & Parts
Topic: Quest for paintball alternatives
Replies: 1
Views: 126

Quest for paintball alternatives

I have been seeking alternatives to paintballs for some time and thought I had the perfect solution in the "dimpled wax shell powder balls" but they are now not available apparently despite the continued listing by several retailers. I tried some yellow foamies which are fairly precise (52 grains+- ...
by Anatine Duo
Fri Jan 17, 2020 6:41 pm
Forum: Pneumatic Cannons
Topic: compact precision launcher
Replies: 3
Views: 222

compact precision launcher

Velocity test on a can of water:



Almost finished...

It has a 1/2" qev, 0.875" barrel. My first breechloader I think. Barrel short enough to muzzleload an arrow.

Going for a California-legal look.
by Anatine Duo
Sat Dec 14, 2019 3:10 pm
Forum: Pneumatic Cannons
Topic: Syncing of multiple valves.
Replies: 10
Views: 402

Re: Syncing of multiple valves.

I hope to see you build this with shutoffs on the pilots for testing... it's very interesting. I had planned a 3 by 1" valve launcher piloted by a 1" until I realized one of the three is damaged. Piloting 2 by 1" with a 1" seems extreme, though I got the valves for free so whatever, right?
by Anatine Duo
Fri Dec 13, 2019 7:38 pm
Forum: Pneumatic Cannons
Topic: Syncing of multiple valves.
Replies: 10
Views: 402

Re: Syncing of multiple valves.

I was planning the same with irrigation valves. I guess the question is: how to know which one is opening first? If we knew that we could alter the tube length to the pilot valve to synchronize the openings of the main valves. Using identical-ish valves on a long barrel launcher with heavy projectil...
by Anatine Duo
Mon Jul 15, 2019 6:54 pm
Forum: Ammo & Parts
Topic: CO2 cartridges as projectiles
Replies: 12
Views: 1286

Re: CO2 cartridges as projectiles

When I tried this I had similar results. I tried adding mass to the nose, tried some poorly made fins, and I think my long barrel helped, but never got more than 150 feet (measuring straight... projectile often covered much more than that in various directions) Perhaps with enough mass on the nose a...
by Anatine Duo
Sun Apr 14, 2019 3:34 pm
Forum: Pneumatic Cannons
Topic: first sprinkler valve
Replies: 6
Views: 1555

Re: first sprinkler valve

added some furniture sv1 with stock.JPG Fairly ergonomic if I raise my right elbow until my arm is horizontal. Every time I hack one of these together with an assortment of adhesives and fillers instead of fittings and craftsmanship I tell myself it's the last time. It often leaks, and then it gets ...
by Anatine Duo
Mon Apr 08, 2019 7:01 pm
Forum: BB, Airsoft, and Pellet Guns
Topic: Can someone good help me ? please
Replies: 64
Views: 8294

Re: Can someone good help me ? please

Modify blowgun for better flow.
by Anatine Duo
Thu Apr 04, 2019 5:59 pm
Forum: BB, Airsoft, and Pellet Guns
Topic: My first .177 pellet gun
Replies: 14
Views: 1861

Re: My first .177 pellet gun

The offset bits are very appealing. Informal balance FTW!
by Anatine Duo
Tue Apr 02, 2019 9:55 am
Forum: Pneumatic Cannons
Topic: FOOMP
Replies: 28
Views: 3869

Re: FOOMP

Clean and simple, thumbs up!
by Anatine Duo
Mon Apr 01, 2019 1:55 pm
Forum: Pneumatic Cannons
Topic: fastest sprinkler valve launcher
Replies: 1
Views: 548

fastest sprinkler valve launcher

Is this the fastest 1" sprinkler valve launcher at 100 -105 psi with a 26" barrel? After much chronograph testing and many spurious readings (up to 897.5 fps) I revised my set-up and got: IMG_5959.JPG with a 1.75 gram plastic and duct tape cone. The cone did multiple shots, 742, 760, 772 (from SV1) ...
by Anatine Duo
Mon Apr 01, 2019 7:21 am
Forum: General How-To & Discussion
Topic: "In the world of spuds today"
Replies: 2403
Views: 125389

Re: "In the world of spuds today"

I think there is other stuff going on that makes it hard to measure peak pressure. There might have been part of a thread here about it. Pressure gauges need time to indicate, and moving pistons create pressure spikes that last for very short times. I think to measure momentary pressure there are st...
by Anatine Duo
Sun Mar 31, 2019 8:38 pm
Forum: Pneumatic Cannons
Topic: Supersonic peashooter
Replies: 5
Views: 792

Re: Supersonic peashooter

I think we would all like to see something like this. I've played with the concept a few times but the big problem is the inefficiency of the spring piston set-up. I think they rarely get better than 35% efficiency https://airgunwarriors.com/resources/library/Internal_Ballistics_of_Spring_Piston_Air...
by Anatine Duo
Sun Mar 31, 2019 3:27 pm
Forum: Pneumatic Cannons
Topic: chamber seal versus barrel seal
Replies: 2
Views: 499

Re: chamber seal versus barrel seal

It's good to know I am at the extremes :)

The Hunter valve that I converted to barrel seal might give slightly better performance but the main advantage is how fast it seals when using a bike pump. The chamber seal version takes 3 pumps to seal. The barrel seal holds air instantly.