Search found 2381 matches

by wyz2285
Wed Sep 02, 2020 3:28 am
Forum: Pneumatic Cannons
Topic: Valve jam with liquid gas
Replies: 13
Views: 291

Re: Valve jam with liquid gas

I'll get some photos
by wyz2285
Tue Sep 01, 2020 2:22 pm
Forum: Pneumatic Cannons
Topic: Valve jam with liquid gas
Replies: 13
Views: 291

Re: Valve jam with liquid gas

So I did more testing, the exhaust is too small and gas in liquid form does not flow and pilot the valve properly. But even if I fill it will gas in gas form, the piston get stiff after not many uses, the o-ring gets really dry. Any suggestion for o-ring material? Or I should used two o-rings so som...
by wyz2285
Tue Sep 01, 2020 2:34 am
Forum: Pneumatic Cannons
Topic: Valve jam with liquid gas
Replies: 13
Views: 291

Re: Valve jam with liquid gas

No, with air is fine. However I'm just trying to learn the reason of it, plus I was hoping to use the launcher quite mobile, the portability of a propane can is interesting.
by wyz2285
Sat Aug 29, 2020 10:24 am
Forum: Pneumatic Cannons
Topic: Valve jam with liquid gas
Replies: 13
Views: 291

Re: Valve jam with liquid gas

So I started with a coaxial piston launcher with plans to use solenoid to trigger it. However if I fill it with propane in gas form (filling with bottle pointing upwards) it kinda makes a decent Bang. Then I filled it with the propane bottle upside down so the liquid can get in expecting more power,...
by wyz2285
Sat Aug 29, 2020 10:24 am
Forum: Pneumatic Cannons
Topic: Valve jam with liquid gas
Replies: 13
Views: 291

Re: Valve jam with liquid gas

So I started with a coaxial piston launcher with plans to use solenoid to trigger it. However if I fill it with propane in gas form (filling with bottle pointing upwards) it kinda makes a decent Bang. Then I filled it with the propane bottle upside down so the liquid can get in expecting more power,...
by wyz2285
Fri Aug 28, 2020 4:47 am
Forum: Pneumatic Cannons
Topic: Valve jam with liquid gas
Replies: 13
Views: 291

Valve jam with liquid gas

So I have been toying around the idea of using propane with solenoid valves and piston valves. However the valve jams every few shoots. The o-rings on the piston are free float and seals fine, but the piston opens very slowly, as if the o-rings are swollen. Is it because of the cold? Any suggestion ...
by wyz2285
Mon Apr 27, 2020 5:38 am
Forum: General How-To & Discussion
Topic: Short question topic
Replies: 1488
Views: 101111

Re: Short question topic

Any one could tell me whats these holes on the baffle are for? Like why isn't the hole/cut mirrored? Wouldn't' it cause non uniform turbulence?Image
by wyz2285
Thu Apr 09, 2020 2:46 am
Forum: Off-Topic Hobbies
Topic: "Offtopic-posts-topic" NSFW
Replies: 6630
Views: 270401

Re: "Offtopic-posts-topic" NSFW

Wow, SpaceX! Nicely done! Fortunately and unfortunately, I just love this sport a bit too much and ended up just being an engineer at Novritsch. No regrets though! and thanks for mentioning! Funny enough I was thinking of when I joined the files last night and what were my first posts so I checked i...
by wyz2285
Sat Nov 23, 2019 3:41 am
Forum: General How-To & Discussion
Topic: Short question topic
Replies: 1488
Views: 101111

Re: Short question topic

Balanced vs unbalanced regulators, whats the difference and why one is better than the other?
by wyz2285
Tue Oct 29, 2019 9:55 am
Forum: General How-To & Discussion
Topic: Short question topic
Replies: 1488
Views: 101111

Re: Short question topic

Ahhh, that makes much more sense now. I baffled by the quantity of variables one has to account to build the most efficient spring gun. Thankfully no such things for HPA... Just kidding, I'm still reading that GTA thread, the guys over there are just insane about the efficiency and details...
by wyz2285
Tue Oct 29, 2019 9:32 am
Forum: General How-To & Discussion
Topic: Short question topic
Replies: 1488
Views: 101111

Re: Short question topic

I always thought a light and fast trveling piston is better beacause it compresses air faster, reaching a higher peak pressure before the projectile overcomes the friction. I always imagined the projectile takes some time to start moving no matter how much pressure is behind it, therefore a fast pis...
by wyz2285
Tue Oct 29, 2019 9:16 am
Forum: General How-To & Discussion
Topic: Short question topic
Replies: 1488
Views: 101111

Re: Short question topic

With higher compression I think the heavy piston will match the lighter one maybe even more. Probabaly increase the felt recoil and noise too... I like the feeling of the light piston, but the heavy sounds so good atm plus I'm have 0 variation in FPS. One the lighter piston I don't have such absurd ...
by wyz2285
Tue Oct 29, 2019 8:42 am
Forum: General How-To & Discussion
Topic: Short question topic
Replies: 1488
Views: 101111

Re: Short question topic

Very unfortunalty the spring is pre compressed into different length with the two pistons, the heavier piston is compressing the spring slightly less. Taking that into consideratin, they produce similar power, around 0,2 J less on the heavy. The sould could be duo to the 3D printed cup seal I used o...
by wyz2285
Tue Oct 29, 2019 8:39 am
Forum: General How-To & Discussion
Topic: "boxer" piston spring airgun and balanced valve
Replies: 7
Views: 3312

Re: "boxer" piston spring airgun and balanced valve

So if you make the valve stem length adjustable so the bleed port is half covered, then it's only exposed after the valve has open to a certain depth (AKA the needed dwell), closing the vavle in the right time.
by wyz2285
Tue Oct 29, 2019 8:29 am
Forum: General How-To & Discussion
Topic: Short question topic
Replies: 1488
Views: 101111

Re: Short question topic

Well I experimented with a caron fiber piston and a solid aluminium piston, the lighter one produces almost no recoil but is louder, while the heavy one produce noiceable recoil but is quieter...