Search found 62 matches

by acs2997
Thu Nov 29, 2012 6:03 pm
Forum: General How-To & Discussion
Topic: Questions about a blow-forward bolt
Replies: 12
Views: 2348

If i could get something like that to work, it would look so sick! :D
what psi does that use?
by acs2997
Thu Nov 29, 2012 5:42 pm
Forum: General How-To & Discussion
Topic: Questions about a blow-forward bolt
Replies: 12
Views: 2348

Interesting. can you post a link?

I have also been looking into a way to connect my air tank to a hopper, but in my design, it seems my golf ball would fall down before the gun could shoot.
by acs2997
Thu Nov 29, 2012 4:46 pm
Forum: General How-To & Discussion
Topic: Questions about a blow-forward bolt
Replies: 12
Views: 2348

Questions about a blow-forward bolt

I'm in the middle of designing a semi auto pneumatic gun and to do so, I was considering using a blow-forward bolt but after looking over several diagrams and pictures, it seems this might decrease the speed of each shot. I'm not sure if this is true or not, so if there's anyone who has made one, or...
by acs2997
Tue Jul 17, 2012 1:22 am
Forum: Pneumatic Cannons
Topic: My First Piston Valve Launcher
Replies: 25
Views: 1244

so you dont reccomend aq half tennis ball?
by acs2997
Mon Jul 16, 2012 8:14 pm
Forum: Pneumatic Cannons
Topic: My First Piston Valve Launcher
Replies: 25
Views: 1244

and the need for the screws?
by acs2997
Mon Jul 16, 2012 8:06 pm
Forum: Pneumatic Cannons
Topic: My First Piston Valve Launcher
Replies: 25
Views: 1244

i actually have already watched that one! thanks a ton though, ive looked all over youtube as well as this website. i think i have all the info and instructions ill need. theres only two more thing i was wondering about: how long does it take for the air to travel through the hole in the piston and ...
by acs2997
Mon Jul 16, 2012 7:44 pm
Forum: Pneumatic Cannons
Topic: New cannon Design Help=)
Replies: 12
Views: 672

I'm not sure what kind of barrel material you're using, but be careful with 1.5" - i know for PVC youre going to want sdr 21, not sch. 40 or 80
by acs2997
Mon Jul 16, 2012 7:27 pm
Forum: Pneumatic Cannons
Topic: My First Piston Valve Launcher
Replies: 25
Views: 1244

jsefcik messaged me all of that information. price, avalability, etc. I think im gonna stick to the piston valve. but the main reason i would use a cross or 4 way tee is so that i could attatch two air tanks that run parralel to my barrel, without being directly underneath. i plan on incorperationg ...
by acs2997
Mon Jul 16, 2012 4:17 pm
Forum: Pneumatic Cannons
Topic: My First Piston Valve Launcher
Replies: 25
Views: 1244

its so i could have two air tanks instead of one. sure, i could just make a super large air tank, but i was hoping on having two if possible
by acs2997
Mon Jul 16, 2012 3:51 pm
Forum: Pneumatic Cannons
Topic: My First Piston Valve Launcher
Replies: 25
Views: 1244

Im going away soon to block island. like tomorrow kinda soon. thanks for all the help! i've came up with a really interesting kind of reloading system, so ill be sure to include that into my gun. one more question: would it be possibly use a 4 way tee for a piston valve? one like this: http://www.am...
by acs2997
Mon Jul 16, 2012 9:42 am
Forum: Pneumatic Cannons
Topic: Sitting on a load of cash.......now what should I build?
Replies: 17
Views: 1170

i agree, the bigger the better.
by acs2997
Mon Jul 16, 2012 8:40 am
Forum: Combustion Cannons
Topic: Vapour pressure?
Replies: 4
Views: 698

I believe the atmosperic pressure is often disregarded, but if you really want to find out the total pressure, I think you just need to add 14.7 psi (im not sure what that is in other measurements) to your vapor pressure. its quite simple.
by acs2997
Sun Jul 15, 2012 1:08 pm
Forum: Pneumatic Cannons
Topic: 2" T Piston Valve
Replies: 90
Views: 6531

oh sorry, i accidently typed in 61 bar into my converter:p yeah, pvc would be fine for those pressures as long as the size isn't too big.
by acs2997
Sun Jul 15, 2012 12:59 pm
Forum: Pneumatic Cannons
Topic: 2" T Piston Valve
Replies: 90
Views: 6531

if you want to be able to use your gun to its full potential, use more metal instead of pvc. unless the pvc is different elsewhere, it wont hold 17 bars. im from the US and the pvc here cant nearly withstand that much pressure. just a suggestion. If you dont have a heavy duty compresser, maybe pvc w...
by acs2997
Sun Jul 15, 2012 12:50 pm
Forum: General How-To & Discussion
Topic: Calculating combustion pressure
Replies: 10
Views: 2914

i know it might not be possible for you (considering you may have to take apart your launcher) but in the past, i've seen people replace their barrel for a screw on endcap with a pressure gauge and then "fire" the gun. its a little risky because the chamber could just explode if the psi goes over th...