Search found 43 matches

by omniscient
Sun Mar 27, 2011 4:21 pm
Forum: Off-Topic Hobbies
Topic: Another Thingy Invention
Replies: 89
Views: 4658

boytonstu,

I sent you an email (not a PM- an actual email) about your invention. - Hope it helps. :wink:
by omniscient
Sun Mar 06, 2011 4:07 pm
Forum: Pneumatic Cannons
Topic: Max preassure on "quick connect fittings" and more
Replies: 11
Views: 1135

There is no way that I'd trust that (Dixon) type of quick-disconnect fitting at 40bar, let alone 70 bar.
by omniscient
Sat Mar 05, 2011 11:05 am
Forum: BB, Airsoft, and Pellet Guns
Topic: Nerf Vulcan BBMG hopper help.
Replies: 7
Views: 1233

Re: Nerf Vulcan BBMG hopper help.

I am converting my NERF Vulcan into a BBMG. It's powered by CO2 and uses a compressor blowgun. It is not a vortex gun, it's just straight fed. I need help coming up with a hopper or feeding mechanism of some sort. I've thought of many ideas, but so far, non of them will work. Any suggestions? Ooh! ...
by omniscient
Sat Mar 05, 2011 5:03 am
Forum: Ammo & Parts
Topic: Frozen Spuds & Such
Replies: 16
Views: 1394

Any time you "harden" your ammo you make it more destructive. Anything solid. Thing like oranges, lemons with a pulp texture tend to mush. I've all ways wanted to freeze a egg and try it but I have a 1" bore ... :wink: jrrdw - Have you ever tried a piece of #8 rebar? Nominal Diameter is supposed to...
by omniscient
Sun Feb 13, 2011 12:08 am
Forum: Pneumatic Cannons
Topic: What fits in a 1/4" copper tube?
Replies: 4
Views: 412

1/4" Steel Brake line has an inside diameter of 3/16" (0.188)

1/4" Galvanized or "Black Iron" pipe has an I.D. of 0.364"

1/4" Copper "K" pipe: 0.305"

1/4" Copper "L" pipe" 0.315"
by omniscient
Wed Feb 09, 2011 9:35 pm
Forum: Combustion Cannons
Topic: N33b who needs some pro help
Replies: 22
Views: 1767

From what I see playing around with HGDT's range calculator, it seems unlikely that such a projectile is going to reach 500 yard range without assistance from wind or topography. Even with a fairly optimistic drag coefficient of 0.5, it doesn't look like a potato is heavy enough. It might be possib...
by omniscient
Wed Feb 09, 2011 7:28 pm
Forum: Combustion Cannons
Topic: N33b who needs some pro help
Replies: 22
Views: 1767

Cut a full-grown pumpkin open and you'll find the center mostly hollow, so your comparison of throwing a rock as opposed to throwing a handful of sand, is not even close to comparing a spud next to a pumpkin. I had mentioned freezing a pre-cut potato slug, but only to help prevent the potato from sh...
by omniscient
Wed Feb 09, 2011 1:45 pm
Forum: Combustion Cannons
Topic: N33b who needs some pro help
Replies: 22
Views: 1767

As previously stated on this forum it's a shame sometimes that people put so much effort into their launchers while neglecting the projectile itself - ie if its performance you seek, it's no use building the best combustion ever if you still insist on firing potatos... I also agree that people who ...
by omniscient
Wed Feb 02, 2011 3:01 am
Forum: Hybrid Cannons
Topic: Hybrid Fueling Spreadsheet
Replies: 19
Views: 1984

Hybrid Spreadsheet v1.0

First attempt (ever) at making a spreadsheet... Not too easy, when you don't have the slightest clue as to what you're doing! Geez!... I barely figured out how to save something as a .zip file, just so that it could be added as an attachment to this post... Sucks, not to be computer-savvy. The file ...
by omniscient
Thu Jan 27, 2011 1:53 am
Forum: Combustion Cannons
Topic: new to site and need some tips...
Replies: 16
Views: 2402

jackssmirkingrevenge wrote:*cough*
Uh... your link to a 60ml syringe will only yield a 2.8% fuel mixture - :wink:
by omniscient
Wed Jan 26, 2011 5:36 pm
Forum: Combustion Cannons
Topic: new to site and need some tips...
Replies: 16
Views: 2402

critter wrote:If I do a psi gauge and pipe what psi would I use
2psi in 11-3/4" of 2" SCH40 PVC pipe.
:roll:
by omniscient
Wed Jan 26, 2011 12:55 pm
Forum: Combustion Cannons
Topic: new to site and need some tips...
Replies: 16
Views: 2402

Your C:B ratio is 1.36:1 A larger ratio such as this will produce a loud report, but a larger report doesn't equate to a more powerful cannon. Your chamber volume is actually large enough to support a 7-1/2' long barrel of 1-1/2" pipe. Spray-n-pray is not the ideal method for fueling a launcher, eve...
by omniscient
Tue Jan 25, 2011 9:55 pm
Forum: Hybrid Cannons
Topic: hybrid fueling
Replies: 24
Views: 3136

With 2BAR of compressed air and (about) 2psi of propane in the chamber, his mix was only 4.535% ...(Again: "about") The only thing to really worry about, is that the peak combustion pressure of successfully igniting a mixture as he's described, is slightly over 300psi. ... Well, actually ; I do have...
by omniscient
Mon Jan 24, 2011 8:00 pm
Forum: General How-To & Discussion
Topic: SketchUp questions and new gun preview
Replies: 5
Views: 796

The "rectangle" ; Did you want to create a groove in it, similar to this?
by omniscient
Sat Jan 08, 2011 12:28 am
Forum: Pneumatic Cannons
Topic: sprinkler leaking through pilot exhaust when pressurized
Replies: 14
Views: 1299

Thanks for the reply No, the sprinkler valve is attached correctly (i.e., arrow is pointed towards the barrel). The gun fires fine, but the air leaks out of the pilot exhaust valve stem, so you need to fire it before the air all leaks out. <b>I'm not sure what you mean by # 2... how would this make...