SPUDr my version of the SPNKr

[Novacastrian]

Nice cannon Ninja, can't wait till you make an "advanced" combustion, can i ask why you choose to build combustions over pneumatics? I am a combustion fan myself (Bigger Hybrid fan ). I have built like 15-20 combustions and two hybrids, also a Piston co-axial pneumatic. That's like one to twenty!
Any chance of you building a Pneumatic in the future? Again, great cannon.

Welcome to Spudfiles

[paintballninja]

thanks, not sure about a pneumatic, the only pneumatics i know about are with paintball guns (i used to be a gun tech @ a store i worked @), i may do some more research into it though & see what i can do just for the exp. went with combustion first cause it seemed the simplest to do at the time, as i said before i'm still a n00b @ this, but fear not, there are more cannons to come it's just a matter of obtaining the supplies, again, thanks

[Ragnarok]

Please - don't use @ as a stand in for at. It's seriously annoying to read, and "at" takes you the same number of key presses and can actually be typed quicker.
Although such practises are understandable in messages of limited length, I don't think anyone has ever written a message so long that the forum has rejected it.

Cool launcher, I like Halo, and I once considered a version of the M19 SSM like you did, but gave up on the idea.

[Fnord]

Having never played halo I assume SPNKr translates to "spanker", right?
Some decals and fiberglass bodywork could easily make it look similar to the gun it's based on. Be sure to take it to your next halo party if you ever get that done

I have built like 15-20 combustions and two hybrids, also a Piston co-axial pneumatic. That's like one to twenty!

Where the hell do you get your money from ?
I can't imagine having that many projects laying around.

My inventory:
3 garbage minis (including the cardboard gun), 2 need a new igniter. <$5
1 basic combustion $0
1 huge combustion (working, but ugly until the weather gets warmer) ~$10
1 bbmg, scrapped/rebuilt once ~$10
1 hybrid, scrapped/rebuilt once. ~$40

Yeah, that's right, no pneumatics. And I've actually never seen a sprinkler valve in person. go figure.

[grumpy]

if your doing a double barrel you may want one of these.

[psycix]

if your doing a double barrel you may want one of these.

One chamber - two barrels will not work very well.
One projectile will amost always be the first out and thus vent the chamber, losing the pressure for the other projectile wich will shoot crap.

Secondly, does it have a pressure rating?
It looks kinda weak.


@fnord, why not build a piston valved cannon then?

[paintballninja]

ok, sorry for the @ symbols, my bouble barrel design is going to basically be two cannons put together, so i can fire them independently, my plan is to hook up some toggle switches that have terminals that arent too close to each other so they dont short out the spark, either that or cover them in silicone, not sure how yet, & at the back i'll have a fan in each tube, i'm thinking of using two 1' pieces of 2'' connected to two 1' pieces of 1 3/4'' for the fireing chambers, & two 2', 1 3/4'' pieces for the barrels, barrels & backs will be removable, propane cylinder will sit on top between the two fireing chambers & i'll have a ball valve connected to propane on one side & the other side will go to a "T" that will feed fuel to the two chambers, i'll try to draw up some designs later so you guys can see what i'm talking about

[grumpy]

psycix:
those realy are pressure rated, they are used in irigation.

[paintballninja]

well turns out my plans have to change again, apearently they only make pvc in 1/2'' increments, so im going to have to go with 1 1/2'' barrels, but i've figured out what adjustments i have to make so it's not that big a deal, also i've decided to add a couple more smaller ball valves to the gas system for safety reasons, dont want fire shooting back into the propane, could be hazardous to ones health, with the toggles i think i'll just use some screws & a wire connected in a "V" shape that i can switch back & fourth, simple yet effective, i'll try to get some designs drawn up so it can more easily be understood

[paintballninja]

ok here's my idea, keep in mind these are just concpetual, not to be taken as finished product, so they are most likely not completely accurate to scale or design, but a rough draft if you will, feal free to hit me up with questions or suggestions, first up is the basics of the ignition system & fuel system, second is a top & side draft

[psycix]

Those plans are AWESOME!
They look very good and promising.

The only thing I can mention is to watch the C:B ratios, maybe do a little co-ax to fix that. Not completely co-ax but more like having the barrel sticking in the chamber only a foot.

Keep on the good work and I hope these plans will be realized sometime.

[octane89]

Those look good.
Here's this to help figure out how much fuel you will need to add into your chambers, and how long the line will be (that hold the propane fuel).
http://www.burntlatke.com/ft_splash.html

[mega_swordman]

Now that, my good friend, are very nice looking plans. Furthermore, you seem to have the right idea going. I can see the schematics you have for the electronics will work well for your needs, but i have a quick question.

Will this wiring go into the handle or onto the back of the gun alongside the propane injector. Also, will you be using a toggle switch or the push button like you have in your overview of the gun.

It also may be worth adding in the schematics for the fans, granted this will all be housed in one area. Which leads me to my next question. Will all this be housed in one container/project box/etc. And if so, how will this fit in with the detachable back? Will you have a quick connect for the wiring or will the backs be semi-permanent?

I think that personally the wiring for the fans should be housed separate from everything else and each other, resting on the detachable part of the back. That way you have yourself a breech loader (add camlocks for easy loading)

*huff* There. My rant is over.

[paintballninja]

thanks for the input guys, i diddn't think the plans were that nice but ok, thanks any way, ok first i have an edit, the 3/4 ball valve is actually 3/8, sorry, ok thanks for the c:b raito idea & link for fuel ratios, as for the electronics i think i'm going to have to make the back half non- removeable, yeah, i thought about that after i made the plans, the chambers & back halves, will be connected to the lowers (trigger, foregrip, ect.) and to make it detachable would be more work than i care to put in to it lol, the toggle will basically be three screws on a mount of some kind, with a wire or other type of connector i can move between the two different contacts, i cant find a pre-made toggle switch that has the inner terminals far enough apart to keep the arc from shorting, i'm useing a standard bbq ignitor for the arc, as for the fans, their switch/power supply will be in a seperate box somewhere on the lowers, or maby a power supply on the upper & a switch by the ignitor or something, i havn't got that far in the design yet to figure it out, i'll be using the same lowers from the first attempt of this gun, eventually everything in the middle will be housed in a box to look more like the SPNKr but thats even further down the road, again thanks for all the feedback guys, it's really helping

[Novacastrian]

I have built like 15-20 combustions and two hybrids, also a Piston co-axial pneumatic. That's like one to twenty!

Where the hell do you get your money from ?
I can't imagine having that many projects laying around.

My inventory:
3 garbage minis (including the cardboard gun), 2 need a new igniter. <$5
1 basic combustion $0
1 huge combustion (working, but ugly until the weather gets warmer) ~$10
1 bbmg, scrapped/rebuilt once ~$10
1 hybrid, scrapped/rebuilt once. ~$40

Yeah, that's right, no pneumatics. And I've actually never seen a sprinkler valve in person. go figure.[/quote]

Sorry about the delayed reply Fnord, but here it goes.
1. All of my combustions are ignited by the same bbq piezo.
2. I try and make my barrels interchangable.
3. I have only ever spent $30 on barrels (Metal combustion, pneumatic, mini hybrid.) and it was the same "gold" plated Aluminium tube.
4. Chamber materials and such are obtained free of charge (Offcuts so to speak)
5. Mostly i make all my parts, so no profit for Mr Hardware store.
6. All parts and said cannons are built in work time, so i actually get paid to make cannons
7. Most of my cannons, about 70% are minis.

So in conclusion, all my cannons have actually made me money