Search found 231 matches

by grock
Wed Jan 05, 2011 1:10 am
Forum: Pneumatic Cannons
Topic: belt fed cartidges
Replies: 24
Views: 2798

you could set up a cam system, i know theres a thread on here, it was a pump action one, pump backward, it moved halfway, pump foreward, it finished the 1/6th rotation
by grock
Mon Jan 03, 2011 5:16 pm
Forum: Combustion Cannons
Topic: BL 520 inspired build
Replies: 6
Views: 872

Besides looks, the barrel is offset to allow for a mixing tube to run parallel with the barrel inside the chamber You would subtract the volume of the barrel, because the barrel is taking up that space that gas/air is not in ehh.... it varies depending on who you ask. usually between .75:1 and 1.1:1
by grock
Mon Oct 11, 2010 5:39 pm
Forum: Ammo & Parts
Topic: 2" ammo for my cannon
Replies: 5
Views: 609

trythese out. they work really well
by grock
Mon Sep 06, 2010 2:50 am
Forum: Pneumatic Cannons
Topic: Will this work or not?
Replies: 3
Views: 464

no. if your drawing is to scale, your going to have a pretty lame shot unless you use high pressures, because the chamber is pretty small. also keep in mind that your shots get progressivly weaker, as your main chamber pressure decreases. then there is the matter of the valve. do you have a 4 way va...
by grock
Mon Sep 06, 2010 2:26 am
Forum: General How-To & Discussion
Topic: Embarrassed to be Kiwi - NZers being stupid with spudguns
Replies: 24
Views: 1570

Personally, I think it's a great safety video. Learn from other's mistakes. Actually, I disagree. He didn't seem very injured, as it was a low powered cannon, and it might convince someone that it was a safe idea. If the kids were shooting a bigger gun, or different ammo, the video could have had a...
by grock
Mon Sep 06, 2010 2:18 am
Forum: BB, Airsoft, and Pellet Guns
Topic: HP/low volume vs. LP/ high volume in relation to accuracy
Replies: 28
Views: 3208

i agree with jhalek, but another option if you need a longer barrel, is to go to your local airsoft shop, usually when someone buys a tightbore barrel upgrade, the store keeps the stock barrel around, for a "just in case" they're not usually expensive and are usually pretty decent quality.
by grock
Fri Aug 06, 2010 11:10 pm
Forum: Pneumatic Cannons
Topic: Help me with a Mauler Design Change
Replies: 15
Views: 1864

something i did to make my piston servicable was make use 2 triangularish plates with 3 threaded rods connecting them, to hold the back cap on. the front plate centered on the barrel, and the back plate was more or less centered by the front plate. check it out unfortunetly, it would raise the price...
by grock
Sat Jul 10, 2010 3:23 am
Forum: Pneumatic Cannons
Topic: Help with my barrel sealing piston.
Replies: 10
Views: 1386

the bolt and the washer stop the sealing surface from being blown out the chamber, because the force going around it and out the barrel will usually rip it off after a few shots one thing i saw once was someone cut pieces of pipe to make a square around the barrel, which was also slightly smaller th...
by grock
Mon Jul 05, 2010 1:05 pm
Forum: General How-To & Discussion
Topic: Emptying a CO2 Cartdridge
Replies: 19
Views: 4239

at my local paintball field i just walk around and pick them up, sometimes theres a little rust on/in them though
by grock
Tue Jun 29, 2010 8:33 pm
Forum: Pneumatic Cannons
Topic: Supressor Question
Replies: 13
Views: 1227

hang on... so a supressed firearm with a permantly attached supressor is legal?
by grock
Wed Jun 23, 2010 5:06 pm
Forum: Pneumatic Cannons
Topic: Supressor Question
Replies: 13
Views: 1227

awesome. thanks guys
by grock
Tue Jun 22, 2010 11:03 am
Forum: Pneumatic Cannons
Topic: Supressor Question
Replies: 13
Views: 1227

Supressor Question

I was thinking of making a suppressor for my GB gun. In a perfect world, i would be nice for it to be completely silent. my thinking on suppressor volume is that it has to equal the expanded volume of my chamber. for example (to keep the math nice), if i filled my chamber to 150psi (~10x atmospheric...
by grock
Sun Jun 20, 2010 11:45 pm
Forum: Pneumatic Cannons
Topic: Pneumatic repeater....
Replies: 8
Views: 917

i use a co2 tank>remote line (tank is back mounted for airsoft)>regulator> paintball thread to NTP adaptor>quick connect> chamber. i get alot of shots, and my field also has paintball, so i get all day co2 for $10. itts also the most portable system (or swap the tank for an HPA one) unfortunetly, th...
by grock
Sat Jun 19, 2010 8:22 am
Forum: Combustion Cannons
Topic: Mixing Valve?
Replies: 14
Views: 1632

theres this thing called an air amplifier. its basically a big venturi. the 2" ones from exair get about the right "air it:air out" ratio when propane is used in place of compressed air. unfortunetly, ones in this size are worth about 200 dollars. while expensive, it could fill a fairly large chambe...
by grock
Wed Jun 16, 2010 2:20 pm
Forum: Off-Topic Hobbies
Topic: Guinness world record attempt
Replies: 52
Views: 2266

unless it breaks one of the rules, you should make the toast as toasted as possible, even if it is burnt, because that should eliminate most of the crumple factor