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Old 01-03-2008, 06:45 PM #1
mic49
 
 
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Rocket Launchers

Does anyone know what volume of air is needed to launch a 2" nerf rocket down a 3 foot 2 " PVC barrel at 225 FPS using 200 PSI?
I can do this by trial and error, which will take quite some time and a lot of effort.
I was hoping someone had been through this process and would already know.
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Old 01-03-2008, 11:16 PM #2
BlackAngelSS
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im no math whizz but i build alot of air cannons. use a 3/4 or 1 inch sprinkler valve and youll be all set. a reg ball valve will work too just slap it open quickly. also 200 psi is alot you dont need that much pressure. 100 psi with a 125 pis pop valve will work fine
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Old 01-03-2008, 11:43 PM #3
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Most fields will require the pop-off valve (125psi) in order to bring it on field. I recommend you make the launcher to whatever dimensions are comfortable for you then adjust the pressure to get the distance you need. You don't need much to launch the rocket. If the volume is a bit on the low side then just up the pressure or vise-versa. My personal one uses about 50-60psi and will easily launch a rocket 75 yds. As long as you can release the valve quick enough it will do what ya need it to do. BTW..3 ft barrel? its a bit on the long side.
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Old 01-04-2008, 01:18 AM #4
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a JCS launcher has no more than 16 inches of barrel. 3 foot is way overkill. i would suggest nothing more than 18 inches unless you absolutely need 3 feet for some reason.
in my tests the length of barrel affects the velocity.
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Old 01-04-2008, 08:13 AM #5
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Still need HELP!

Thank you Gentlemen. You have given me much food for thought which has led to more questions.
What do you use to power your rocket, HPA or CO2?
What size container do you use, 12 gram, 9oz. CO2 or 47/3000 HPA, ect?
What do you use as a holding vessel for the propellant between the main cotainer and the launcher?

Where I have gotten to at the moment is using 2" SCH 40 PVC for the main body of the launcher. A 36" barrel to start, a T at the end followed by a quick opening gate valve at the very end acting as a loading/breach for the rocket and then bringing the propellant in through the side end of the 2" T stepped down to 3/4" copper pipe using another quick opening gate valve to fire the unit. I had planned to attach a 20 oz. CO2 bottle to the bottom of the launch tube screwed into an ASA fitting, using macro line feeding to an Evil Detonator reg screwed into a T fitting, at one side of the T a pressure gauge and the other the outlet to the launcher, using the regulator as sort of a handle near the front of the launcher.
Now where I am stuck is what to use to deliver the propellant, will 3/4" copper pipe be a good choice and if so how much of it will I need?
I have tried feeding the launcher via macro line from 2' of 3/4" copper pipe and came to the conclusion that the macro line did not let enough volume of air in fast enough to launch the rocket very far. That is why I am going to use 3/4" to feed the launcher directly.
Any ideas would be greatly appreciated.
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Old 01-04-2008, 09:27 AM #6
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i use a hpa tank ,to a remote line that plugs into a fitting that is epoxied into the air chamber.
For more info check out spudtech.com or Warpig.com tank section
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Old 01-04-2008, 09:53 AM #7
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im having a hard time visualizing your setup. Blackangel put up the best links, spudtech is topnotch.
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Old 01-04-2008, 01:35 PM #8
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BlackAngelSS
What are the dimensions of your air chamber?
What is the air pressure of the chamber?
What is the length of your barrel?
Do you know how many FPS your rocket is going at the muzzle?

These are the keys to getting any launcher to work I believe.
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Old 01-04-2008, 01:50 PM #9
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Old 01-04-2008, 05:00 PM #10
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Mine operates on unregulated Co2 from my guns Co2 supply which is duel 48oz tanks.
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Old 01-04-2008, 05:15 PM #11
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Old 01-04-2008, 07:35 PM #12
R.T.M. Chris
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my $.02 225 fps is way more than you need for a nerf. 150-175 is PLENTY. I get that with about 100 psi in a chamber that is about 10" of 2" PVC pipe. the higher the pressure you use the less volume you need. I use a fill nipple on the chamber and fill with co2 using a coiled remote. I get nervous when i hear about guys using unregulated co2 from their markers because that can be anywhere from 800 psi on up to the 2000 psi range if it is hot. WAY too much for pvc (200-300ish)and even most metal pipe(600ish). You do not want to make a bomb.

also 16-20" is good for the barrel. over 2' so just slows down the rocket or wastes air.

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Old 01-04-2008, 08:17 PM #13
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Quote:
Originally Posted by R.T.M. Chris View Post
I get nervous when i hear about guys using unregulated co2 from their markers because that can be anywhere from 800 psi on up to the 2000 psi range if it is hot. WAY too much for pvc (200-300ish)and even most metal pipe(600ish). You do not want to make a bomb.

No need to worry, the weakest point of my launcher has a 1,000 PSI working pressure. The parts with that 1,000 PSI pressure rating is made to use with Co2 and its pressure changes. The burst disk on the Co2 tank will blow long before the pipe on my high pressure launchers.
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Old 01-04-2008, 09:38 PM #14
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Quote:
Originally Posted by mic49 View Post
BlackAngelSS
What are the dimensions of your air chamber?
What is the air pressure of the chamber?
What is the length of your barrel?
Do you know how many FPS your rocket is going at the muzzle?

These are the keys to getting any launcher to work I believe.

i have 3 different launchers right now and 2 more in planning. We have the 12 gram co2 panzerfausts, Main cannon of our Panzer and our mortar. Each is a totally different design. the tank cannon shoots the hardest. its adjustable with a palmer stabilizer to more speed than we need. So we keep the psi at around 100
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Old 01-05-2008, 12:24 AM #15
xFJx
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There sure is a lot of wasted air pressure going on here. 100 psi is far more than anyone needs to successfully launch a nerf rocket. I used a palmer stab to bring the pressure down to about 60 and used some basic batteries to quickly release the valve.
If you want to try and keep your gun lower pressure make sure that the barrel is directly after your valve so that the air wont try and fill up any unnecessary chambers prior to pushing the rocket out the barrel. Extending the barrel will require the chamber to be larger or pressures higher.

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Old 01-05-2008, 09:04 AM #16
BlackAngelSS
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my Tanks cannon has manual valve so you need a little more psi
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Old 01-06-2008, 07:33 AM #17
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Nice custom launcher!
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Old 01-06-2008, 08:13 AM #18
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Nice custom launcher!
definitely, she's a beaut!
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Old 01-06-2008, 11:49 AM #19
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Exclamation

In the interest of safety and being able to use it anywhere, let me interject some info.

1) Always add a blow-off valve to your design. It makes fields and scenario directors happy. You can get them anyplace that sells parts for air compressors, and they are preset to vent at 125psi and then reseal.
2) Unless you are using 12 grams stay away from CO2. The risk of liquid in the system, and the constant freezing/warming of your materials is not good for the structural integrity of the unit. No one ever factors that little bit of physics in when building these devices. Temperature changes weaken the structural integrity of most materials.
3) Your pipe may be rated at 1000psi, but what about your connections? Do you know enough about engineering and physics to figure out what the joints are rated at. Did you use the correct cement for the pipe, as well as primer and cleaner first?
4) Your gun, tank, mask, and all the other equipment you bring to the field is covered by the manufacturer’s product liability insurance. Homemade equipment is not. Therefore the liability, in the event of an accident, will fall on the field (and the scenario production company if they are using one). (This does not apply to the JCS launcher, as it is manufactured by a reputable company) This means that you need to be understanding of their requirements. If there are things they ask you to do, like integrating a blow-off valve, don’t get pissy and whine about it. Do it and be thankful they are willing to accept the risk for your launcher, and your home shop skills.
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Old 01-07-2008, 02:07 PM #20
cmosser502
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how do youmake a launcher using 12 grams, cna someone show me. id like ot make a launcher that will fire nerf rockets but i want a design where all of the stuff is in a straight line, i dont want an overunder setup.
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Old 01-07-2008, 02:24 PM #21
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I foresee in a couple of years most fields not allowing the home builts anymore due to liablity issues, all it takes is one to blow up running unregulated CO2 into 2"PVC to shut the whole shebang down.

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how do youmake a launcher using 12 grams, cna someone show me. id like ot make a launcher that will fire nerf rockets but i want a design where all of the stuff is in a straight line, i dont want an overunder setup.
cmosser if you want cheap and easy go with the preassure washer handle launcher
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