Northir's Cannons

[Northir]

I figure Ill just post all my cannons here instead of posting a new one every time i make one! in order of creation.

Everyones favorite the 2 piece spray can combustion (i know this is the air cannon section all my others are compressed air and i dont want any crap about it being abs)


SPECS:
Barrel:4' of 2" ABS
Chamber:2'of 3" ABS
Igniter: Standard BBQ Lighter
And at the base of the barrel is a ring of duct tape thats covering a screw that i but in to keep spuds from going to far when loaded

Second Up is my paint cannon, it went through a lot of working reworking and tips from various Site vets


SPECS:
Barrel:2' of 3/4" SCH 40 PVC
Chamber:2' of 1" SCH 40 PVC
Valve:Rainbird 100-DV Sprinkler Valve (havent gotten around to epoxying the solenoid)

Third is my dart sniper which once was a part of my paint cannon


SPECS:
Barrel:A 3' Blow Gun tube taped to fit in a piece of 3/4" PVC
Chamber:34" of 1" SCH 40 PVC
Valve:Standard Orbit 1" Sprinkler Valve

Fourth is my GB cannon off of Mr Crowleys Instructiable found here
http://www.instructables.com/id/Golfbal ... That-Shoo/



Piston:


SPECS:
Barrel: 5' of 1 1/2" SDR 21
Chamber: 58" of 2" SCH 40 PVC
Valve: 2" Piston Valve, Wooden Piston 3" long(Still want to replace it)
At 50 PSI
FPS(GGDT):370
FT*LB(GGDT):208.2
Yardage: ??? havent ever found the round

Fifth the one i made with scraps laying around


SPECS:
Barrel: 2' of 1/2" SCH 40 PVC
Chamber: 1' 6'' of 1" SCH 40 PVC
Valve: 1" Piston Valve, Duct tape piston with a wooden core, no bumper still working out the kinks on this piston, seems to work well, not sure im getting a full release of my chamber through the barrel, could be the lack of a bumper, will have to test tomorrow when i can use the air compressor


Thats all of them for now, ill post more info on each one as i learn new things about them

[queensland spudder]

nice wrk man , ha that combustion chamber is huge . geeze you would think with soo much pvc with the launcher u r holding in the photo it would be farely heavy. BTW how m,uch distance can you get out of the
combustion

[psycix]

That looks like a fine set of cannons.
Got any ideas what to build next?


I won't give you crap about the ABS, but I will tell you about the evil DWV bell reducer you used. Socket depth is very shallow.


BTW, cute cat.

[jackssmirkingrevenge]

Got any ideas what to build next?

He's going to cut down the chamber of his golfball cannon to less than half its current size and make a phantom launcher

[Northir]

Got any ideas what to build next?

He's going to cut down the chamber of his golfball cannon to less than half its current size and make a phantom launcher

yea im working on making the golf ball cannon quieter my landlord doesnt like the sound of it lol as well as a clip system, ive been thinking of a peice of golf ball barrel with a cap and a spring attached to a ball valve with a hole in the side, or maybe a T ball valve if such a creature exists
EDIT: and now that i think about it i might add a female adapter to the chamber to right about where the straight section is and make it so i can find the optimum length for my barrel/chamber

how m,uch distance can you get out of the
combustion

Ive only fired it a few times and only gotten about 200 feet out of it, using spray paint

I won't give you crap about the ABS, but I will tell you about the evil DWV bell reducer you used. Socket depth is very shallow

it says sch 40 on the fitting, in any case i dont use it hardly ever, the air cannons i build are much more fun, faster reload and a lot more power

[jackssmirkingrevenge]

now that i think about it i might add a female adapter to the chamber to right about where the straight section is and make it so i can find the optimum length for my barrel/chamber

Or could download and install Gas Gun Design Tool and model your launcher virtually, saving yourself a lot of time and PVC

[Northir]

yea i use that a lot ive got it open now, if i take my chamber down to 30" i only lose about 50 fps and Ftlbs, and the chamber optimizer says 20 3/4" is my best bet, but sometimes i like the loud noise so id like to be able to change my chamber back
with that chamber id be looking at 117 ft lbs and 278 fps


Update!:
Got it down to 21" and some change, added threaded fittings on both sides so i can put the old pieces back on it i want to, barrel with silencer gives(according to GGDT, i dont have a crony) 321.2 Ft*lb and 460 FPS so im totally fine with that will post a pic in a sec

[nakarti]

I say your tanks are all too big. That maintains power for the shot, but with a smaller tank, say metal, you can fill up a lot faster and go higher pressure.

Every time I think about it, I want to get out to my mom's and (re)build it (drill press and an acre with a hill for backdrop.)

(Edit: Noticed in another thread about bringing down the chamber size, forgot at the time where I said this.)

[Northir]

yea ive brought the size down on the GB cannon quite a bit as well as added a on board compressor

[stefano]

Ho i would like to know how did you managed to mod the 100-DV valve?? The bleed screw is not aligned, would this make a problem??? Or i only have to remove that srew and put the blow gun?