Instructables
ok, the fact of the matter is that led throwies SUCK! the one big reason is that you are limited by the fact that you can only throw so many so far!, so me being a logical sane person i thought" Hey I should use a cannnon!!" so i headed down to my labrotory and this is the result: oh, did i forget to mention its great at shooting other things too. E.G. potatoes, shaped rounds, MUD, watemelon, golf balls(really good at that one), paper shells packed with flower, anything you can fit down the barrel.


Hey thanks goes out to my brother, instructables member Capt.Kirk for helping me make throwies for the project
 
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Step 1: Create the cannon

Picture of create the cannon
ok so im fairly certain that this has to be legally classified as a firearm, my evidence for this is one day i packed the barrel full of bb's and shot it at my fence where now all those bb's currently reside imbedded in the fence!

so to construct the cannon just follow the schematic ive drawn, it'll provide enough info to get almost all of it built, but the main valve is were a schematic just will not do. by the way its a really good idea to use two part gorrilla glue epoxy for the pipes rather than just abs cement, shure it may cost more but i wouldent skimp on it, it could cost you a limb or your life! if any of those parts where to come loose. the reason for this is that i designed this to operate around 250 psi ! so its the only way to ensure a adequate seal between each pipe and fitting
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DanTDM6 months ago

You could add a switch to a LED throwie and use an AA battery instead. You may need a little wire too.

DanTDM DanTDM6 months ago

Oh, and by the way paint the battery florescent orange

~FROGYOU~7 months ago
This is awesome! I've been trying for days to figure out how I was going to make an efficient and large valve for my own cannon, problem solved! Thanks! By the way do you have any videos firing it?
kyle brinkerhoff (author)  ~FROGYOU~7 months ago

yeah its right in the instructable :}

jptrsn1 year ago
Have you tried using plastic bags as mini-parachutes for the throwies? They'd make a good barrel packing, and would let the LEDs rain down slowly. Then again, you'd have to figure out a way to make sure they didn't deploy immediately upon exiting the barrel and shredding themselves to bits...
ilpug3 years ago
Three questions: what PSI are you Using? Why did you choose the sprocket-actuated valve instead of a normal modded sprinkler valve? Does the air compressor charge the cannon too? One thing though: you mention using Gorilla glue in place of PVC solvent cement. That is a major error. PVC cement is designed for PVC, and that alone. Gorrilla Epoxy, while it is badass and strong, may not be exactly formulated to create a perfect bond with PVC. This is a good system.
Ghost Wolf3 years ago
That thing is huge bring that in central park and they'll arrest you when you step one foot in!
Ghost Wolf3 years ago
lol love that look you have in that first photo cracks me up! loma!
9995923 years ago
perhaps you could create an instructable on how to create your spud cannon of death with step by step directions, because as of right now i can not make out how it is assembled.
kyle brinkerhoff (author)  9995923 years ago
i havent really bothered with step by step instructons because so many of the components have to be machined and also just sourcing the parts/materials in of its own is a hugely expensive undertaking, so this is a rather impractical project for the avarege joe
Can you make a video showing the LEDs being fired at a surface? I mean it's kind of the whole point of the project.
kyle brinkerhoff (author)  JamesRPatrick3 years ago
actually the goal was to shower the sky with thousands of colors and then to have those leds land all over a field for a very cool photograph.

and no, i cant do that again because of the time required to make a zillion throwies is rediculas not to mention the lack of $$ for a thousand leds
dude check ebay. I bought 500 insanely bright leds for lk $10
lack of credit card makes this hard lol:]
You can buy VISA giftcards at walmart. They work online.
true haha
It's dangerous to solder directly to the battery?
You know, when batteries overheat they tend to explode, or shoot caustic fumes out of the emergency valves, depending on the type.
kyle brinkerhoff (author)  JamesRPatrick3 years ago
NOT IF YOU KNOW WHAT YOUR DOING!!!!
honestly ive never had a single one blow up on me because of the following
1, low temp soldering iron
2, soldering takes only 3 seconds!
3. i do one side at a time leaving a long cool down period in between
4, all batteries that are used in rechargable aplications ARE SOLDERED in some cases even SPOT WELDED onto each terminal.
Soldering is okay if your quick like a bunny... A lot of batteries are difficult to solder because they have stainless tips. It takes too long to solder it, if you can at all. check it with a magnet first. Commercial batteries are always spot welded. Even if you go to a battery store and have them make custom batteries.
Joke...
kyle brinkerhoff (author)  mr.incredible3 years ago
depends on the heat and duration of soldering, usually i only expose the battery to that temp for a very short amount of time and they seem just fine.
I don't know myself, that just seems to be the recurring comment everytime someone does it.
kyle brinkerhoff (author) 3 years ago
NO IT IS NOT DANGEROUS TO SOLDER ONTO THE BATTERY !
(Provided that you actually know how to solder and not make mountains of semi molten crap)
RadBear3 years ago
Cool. You're going to get a lot of comments on how unsafe it is to solder directly to the surface of a battery.
Its dangerous to solder directly to the battery.
it's not if you know what you're doing.
kyle brinkerhoff (author)  crankyjew3 years ago
agreed!
Knowledge, and a short linger time on the battery with the soldering iron is fine.
kyle brinkerhoff (author)  RadBear3 years ago
YUP!
kyle brinkerhoff (author) 3 years ago
burnt fingers:[
eecharlie3 years ago
If you get a very loud report when fire a potato cannon, I believe that means your barrel is too short.

The gas behind the projectile is still under a lot of pressure when the projectile leaves the barrel if you hear a loud report. If the barrel were longer, the pressurized gas could have accelerated the projectile more, and there would be less (nearly zero, ideally) pressure released when the projectile exits. You'll have to do some math to figure out exactly how long as a function of your pressure chamber volume and firing pressure.
kyle brinkerhoff (author)  eecharlie3 years ago
YES!, this is 1000 percent correct,
allthough their is one caveat to this, this method only helps when applied to combustion cannons and fixed pressure cannons, mine is a system were the psi is changed for almost every shot, this is so i can dial in the range, also the big (ESPECIALLY BIG FOR ME) problem is that this baby tops out in the 200 psi range and given the volume of the tank, the barrels optimal length would be in the neighborhood of 20 FEET to even come close to maximum effiency!

but thanks for bringing that up though, its a valid statement. its just iether i buy the 3 foot sections of pipe from the hardware store or i buy a full 10 foot section. and i also wanted to be able to carry this myself without it being aqward to manuever around stuff, plus not to mention people get a little concerned when they see me out at the local park with something that resembles a flack cannon, when its put on a tripod with a super long barrel.


i mean a quarter mile range is pretty great with the barrel i have on it in this video so i just stuck with it out of sanity
kyle brinkerhoff (author) 3 years ago
leave a rating if you would:]
osepogue3 years ago
The aluminum stuff is called 8020, the "industrial erector set". Check out 8020.net

It is rather pricey, but cool stuff.
kyle brinkerhoff (author)  osepogue3 years ago
drool!
i might spend a little too much dough here
That is the most badass-looking spud-gun that I have ever seen!!!! Instead of paper wadding, a crumpled up plastic Walmart (or similar) bag works well. That is what I use when I am firing my cannon and don't want to actually shoot anything of substance.
haha! THANKS! i actually shot a couple of spuds out of it BUT they have such a high exit velocity that i cant track them with my eyes!, however the one time i did find one of them was when i saw a car at the local gas station smeared with a potato ! its around a quarter mile away from my house where i initially shot it off !
oh btw i tried the plastic bag trick, and kinda works the same as the paper, i think if i got a bunch and rolled them into a slug that would work really well
I like how manly and technical it looks. A simple sprinkler valve works great, and is cheaper. You replace the solenoid with a air nozzle. Load up the tank, and press the air nozzle button and poof. no power required.

I noticed you bypassed the compressor for your test. How long does it take to pump up the tank with the AC?
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