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Re: Optimizing Air Cannon Range
I have found in my vast experience and long history of projectile launchers. the more kenetic energy you can put into a mass before it leaves your grip the faster and further it will go. i have completely given up on Compressed air and almost only use CO2. its cheap, available anywhere with paintball. and as long as there is Liquid CO2 present in the tank the gas maintains a pressure around 1100 PSI. the more pressure you have the smaller you can make your device and the more energy you can put into your projectile's mass. i have stop referring to my CO2 potato launchers as launchers and rather as potato sniper rifles. the vegetables come out of the barrel so quickly that at a range of about 30 feet potato's atomize upon impact of a hard surface. If you relay want to throw a t-shirt up into a crowd with compressed air alone you are going to need allot and I mean allot of it! and a very long barrel to transfer that energy to a shirt. if you want a device you can hold in your hand and shoot out into a crowd an long distances of 150 feet and beyond you simply need more pressure. But please be carefull and remember how Maude Flanders Died.
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Re: Optimizing Air Cannon Range
A sabot casing will greatly increase performance. There's allot on the web for water balloons. Co2 is much better than air, however it's high pressure and needs allot more care. Co2 has it's limits when when large volumes are released. The drop in pressure limits the flash rate. That's why nitrogen has taken over for serious paint ballers.
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Re: Optimizing Air Cannon Range
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Re: Optimizing Air Cannon Range
We performed the test of a manual ball valve today during class. We doubled our range and added to the altitude achieved. The diaphragm based sprinkler valve opens too slowly and limits air flow as suspected. To make this a remote device on the robot we'll use a short throw pneumatic cylinder activated by a festo solenoid. I've got video of the test but no place to upload at the moment that the school filters will allow me access. :ahh:
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Re: Optimizing Air Cannon Range
Finally got our cannon mounted, finished, and tested today. ~40 feet at 80 psi. We hope to extend the range later, but it will be more than good enough for Homecoming tommorow.
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Re: Optimizing Air Cannon Range
It may or may not be relavent now, but if you use CO2 it will be up around 800 psi.
EDIT: oops didn't see the second page of the thread. And aren't paintball gun tanks at around 800 psi? |
Re: Optimizing Air Cannon Range
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wikipedia: "at room temperature it becomes a liquid at a pressure of 60 bar. A tank of liquid carbon dioxide provides a constant 60 bar pressure until the tank is close to being empty." 60 bar = 870.226 psi |
Re: Optimizing Air Cannon Range
We just built an air cannon to fire confetti.. with a delrin projectile we got something like 80-90 ft of range..
I agree that the biggest problem is the valve.. We got a manual-open spinkler valve which seems to work better than the solenoids (which seems to "honk" as others have said) to be honest, the best solution is to use a large valve but those are hard to find, and diaphram types seem to open faster (from what I've read) we'll be improving our cannons (we have 2) so I'll keep posting. |
Re: Optimizing Air Cannon Range
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http://www.chiefdelphi.com/media/photos/25728 :D |
Re: Optimizing Air Cannon Range
Hope to have the robot robot reprogrammed during school tommorrow but this valve just came in today. The local area Parker sales representative was willing to help our our team so that we can take our tee shirt cannon modified robot to a minor league baseball game.:yikes:
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Re: Optimizing Air Cannon Range
Thanks to all of you on this thread and those who helped inspire it. Team 1766 is now looking into making a shirt cannon and then shooting it at sports events. We are hoping to use this as some sort of fund raiser for the team and hopefully even get the team a little attention from the public.
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Re: Optimizing Air Cannon Range
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And Talc itself has some heath problems as well, take a look at this bit from Wikipedia: Quote:
I know, not really related to the subject of Air Cannons, but I thought it was important to point out anyways, especially seeing as my mother almost died from an asthma attack after someone thought it would be a neat idea to put talcum powder in her sleeping bag on a camping trip she went on once. Just wouldn't want anyone grabbing a T-shirt thats been launched at them, only to put it on and stop breathing. ;) |
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Re: Optimizing Air Cannon Range
We had luck using water as a lubricant in the water balloon cannon we built several years ago. It might not be ideal for a t-shirt cannon unless the t-shirt is wrapped in saran wrap or something similar, but it does enhance the cool condensation cloud you get misting out of the barrel afterwards.
Jason |
Re: Optimizing Air Cannon Range
well, we made one, just did not get the valve working the way we wanted. Pressure was ok, just the valve we used didnt fire fast enough. We scrapped it.
Folding the shirt was technique though. Fold like a normal t-shirt going into your drawer; thats the both sleeves in and then fold over so colar is showing on one side. Then after this, fold in half so that the colar is not showig at all, as in it folded the colar in half and its on the inside of the fold. Take that and roll it, it should be perfect for a 3" diameter pvc tube. |
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