Instructables
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This is a poorly done instructable but the outcome is great! I will make up for the lack of step by step pictures with a very detailed set of instructions and parts list, I made the whole thing for less than $10.00 US. Money well spent!
 
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Step 1: Fill Valve

Picture of Fill Valve
The fill valve is installed in the flattest part of the end cap to get a good seal. I used 2 part marine grade epoxy on the inside to seal it as opposed to super glue. It has held for quite some time and seems to be totally air tight. It passed the bubble test, you should put light pressure in the chamber and apply soapy water to all the joints to see if you have any leaks. If there is leaks you will see tiny bubbles.

Step 2: Valve side of the assembly

C:\Users\Owner\Pictures\DSC04039.JPG
This is pretty self explanatory by mousing over the picture. I used this combination for a number of reasons, cost and parts on hand played a major part. I am planning on building a new one with a "tee" before the valve and putting in a 1/4inch fit in bushing and attaching an air hose fitting. This will allow me to attach the air hose from the compressor, thus filling the chamber to the pre set amount of air everytime I close the valve! It should work...
I will also take pictures step by step on the next instructable!
I am also planning to make another air cannon out of inch and a half copper, choked down to half inch copper to use with potatoes and other fruits and vegtables...
Masher0075 months ago

Danger: See link: This is not spam, but a warning. PVC will fail suddenly after a while. This was band member that hurt badly by a T-Shirt launcher explosion.

See the pictures and never use PVC to hold air, Please.

https://fundrazr.com/campaigns/1Zs3c
..

bwells23 years ago
Is that a small rocket at the end?
1BigKid (author)  bwells23 years ago

Yeah it is an air hogs rocket, It is actually the reason it was built. My 3y/o son loved this rocket, I however hated it! It had a really small t handled pump that required at least 30 pumps to fire it just above the tree line. After the 2nd shot you were exhausted! So This was or is the answer! Oddly enough my 3y/o is now a 7y/o and it is still the same. I never got a round to modding it any further and it has not failed to this day! We were just playing with it the other day. He still is to young to fire it and besides I would not really trust it with my only child! He is priceless to me! He is perfectly content watching the rocket go way over the tree line! It goes high enough that you actually loose site of it against the blue sky!
I have built quite a few other projects since then and I always mean to document them for this site but as I stated in this one...I get all amped and can't stop till I am done, at which point the pictures are long past!
One day I will post a good one....

bylerfamily5 years ago
Cool!
theosullis6 years ago
Bigkid1 can you please post an instructable on how you made the power wheels go that fast?
theosullis6 years ago
Your right sorry, but I wouldent tell him it was an air gun I would tell him it was for show>
theosullis6 years ago
I find it dissapointing that you would let your 3 year old son even know you have it, needless to say hold it!
1BigKid (author)  theosullis6 years ago
Why? It is his and how is holding or knowing about it bad? Kids get hurt with guns and such when they are not educated about them, they get curious as to what they are since they can't or don't know about them and then they get hurt! And as stated he does not fire it and therefore it is not dangerous. Also note the date, he is no longer 3 years old... He still does not fire it. It is also explained that it is a kids toy sold in toy stores that I just improved on by allowing it to be used with out the back braking hand pumping. So if you think it is bad or dangerous, you should write a letter to air hogs, the company that sells the toy to begin with. I hope I was able to help you and educate you on gun or air cannon safety. Remember that "Curiosity killed the cat"
Well put! It's the taboo and forbidden that get everyone into trouble. I have "owned" (legally speaking it was my dad's) a firearm for as long as I can remember and only used it at shooting ranges and the like with my dad present and watching closely.He always stressed proper use and caution first. Now that I'm older and independent I fully understand how the thing works and am extremely familiar with gun safety etc. . . a very different bird from those goof offs you see at ranges with their 9mm pistols held sideways (gangsta style?) never even scraping a target close enough to cause eye strain and generally lowering the safety of others simply because no one ever showed them the proper way to handle something as potentially dangerous as a gun. Kudos to you for satisfying your son's curiosity the healthy way! (with a grin that big one can tell he's not bored by the education either!)
1BigKid (author)  Kaelessin6 years ago
Thanks, I appreciate your support! I have a kid that loves to learn and for that reason I am going to teach him anything that his little heart desires. Again, Thanks for your kind words, together we can try to educate the narrow minded...
04sellison6 years ago
nice
blugyblug6 years ago
Sheesh, for a cannon that big with schedule 80 pipe, it looks like theres alot of pressure there, yet you only use a ball valve? Get a sprinkler valve or piston. Much better. Although they are expensive, your cannon looks like it deserves to have a better valve.
frankinator6 years ago
you asked for a way to improve it i don't know if you have learned or saw this since you made you cannon but you can replace the ball valve with a 3/4 inch threade sprinkler valve than modify it fo air dump so that all you have to do is pull a trigger to shoot it insted of spending 1/4 to 1/2 a second to turn the ball valve.
1BigKid (author)  frankinator6 years ago
Well, I did have the thought, However when I tried the inexpensive ball valve, I realized that it worked great and that made happy! I saved a ton of money on the valve and it works great every time! The valve is the last thing I would recommend changing. I will recommend, ABS though! After much research... I have to say ABS is the way to go! I will not go into here but take 5 minutes and do some real research, you will learn what I did! PVC will shatter! ABS just splits. Much safer! No fragments flying out of launcher= good fun...
Good Luck and I look forward to seeing everyones ideas!
mirielle6 years ago
wow thats awesome, and ur son looks very pleased with his new all destructive air cannon. shame he cant fire it tho lol. then again its probably for the best.
Allonsy6 years ago
awww.. ur son is really cute... lol
Easy Button7 years ago
1bigkid nice aircannon but by putting this instructable in the launch-it you must make a video for it to qualify for a chance in winning make a video and you may win!(maybe) thank you!
yeah, please put a video on it!!!
shooter17 years ago
Nice air cannon. cheers mate
could you be a little more clear on your materials? maybe add a page for all of your materials if you can,
1BigKid (author)  atomicpenguin127 years ago
Mouse over the yellow squares on the second picture. I tell you all the parts in the close up picture. Eveything is PVC with the exception of the close nipple and the one bushing, and that is mainly because the store didn't have these items available in PVC. This is just an idea for the cannon, I encourage you to expand on the idea and try to improve it. As I stated in the last comment, I added the 3/4 inch copper barrell and now can shoot paintballs, I am also thinking of doing a mod that will let me auto fill the chamber when the valve is closed! It should work, I just need to get to the store for a few parts. I will do it step by step though next time. If you still have a question regarding parts feel free to ask. I also will add that after a little research, ABS seems to be a better option, Though PVC is pressure rated, ABS is the only plastic pipe that is allowed to be used for compressed air! ABS will split when it ruptures as opposed to PVC which shatters and fragments! You can find this info by e-mailing the National Plumbing Foundation or look it up on Wikipedia, I found it under "Spud Guns" Just my 2 cents!
rocketbat7 years ago
wow! this is so cool! i like how little it costs. and i want that 13mph jeep!!!!!!
1BigKid (author)  rocketbat7 years ago
Yeah, 13 mph didn't seem like much but to a 3 year old it is flyin! I am gonna add a second gearbox to it so it will be 2 wheel drive and that is supposed to give it better speed. I also read that you can put 12 or 13 inch bike tires over the wheels for traction bands but it tears apart the gears... However at 25.00 for a gearbox and motor assembly, it may be worth it! The original cost was only 149.00 and that was a slow ass 6 volt car! I wish I could fit in it! he looks like he is having the time of his life in it! As for the cannon, I made some improvements today! I changed the barrel to a slightly shorter piece of 3/4 inch copper tubing and now it fires paintballs with a vengence! I did have to lower the air pressure to 45 psi though, as any higher just destroys the paintballs and just sprays a mist of paint. It shoots a lot further than an average paintball gun. I am really close to making a new one out of copper. I have most of the parts already and some free time. It is either that or the mag light laser hack! Decisions...