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
Hey thanks goes out to my brother, instructables member Capt.Kirk for helping me make throwies for the project
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Signing UpStep 1: 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
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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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
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.
(Provided that you actually know how to solder and not make mountains of semi molten crap)
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.
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
It is rather pricey, but cool stuff.
i might spend a little too much dough here
I noticed you bypassed the compressor for your test. How long does it take to pump up the tank with the AC?