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Building a launcher: Need Help

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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Unread postAuthor: BigFootWitness » Tue Jul 31, 2007 10:38 am

should this chicken have a tight fit in the barrel or should it be a little loose?
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Unread postAuthor: jackssmirkingrevenge » Tue Jul 31, 2007 10:42 am

Ideally it should be a loose fit in the barrel, then surround it with a wad of newspapers or similar to support it and seal the space behind it.
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Unread postAuthor: mopherman » Tue Jul 31, 2007 11:33 am

BigFootWitness wrote:should this chicken have a tight fit in the barrel or should it be a little loose?

well if it is tight then you should *yuck* lube up that chicken. :?

EDIT! if you havnt already chosen a valve, i would go with a giant burst disk.
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Unread postAuthor: DYI » Tue Jul 31, 2007 12:14 pm

4" diameter union with a burst disk would be pretty entertaining...
But the union alone would cost you 3/4 of your budget.

If you have an air compressor, a pneumatic design would probably be the way to go, if not, combustion would be better, as pressurising a chamber of the size necessary to project a rubber chicken 100 yards with a bike pump would get old really fast.

Also, I don't know if you will be able to achieve your performance goals with the set budget. Pipe and fittings of any material in sizes over 4" are really expensive.
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Unread postAuthor: jackssmirkingrevenge » Tue Jul 31, 2007 12:17 pm

I'd agree that combustions are ideal for large calibre projects with a limited budget that need to be simply constructed.
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Unread postAuthor: noname » Tue Jul 31, 2007 12:27 pm

Personally, I'd go with a 6" barrel and some wadding around the chicken.
Then you need some huge chamber though. I can give you some 8" PVC for a couple bucks a foot, but I'm not paying shipping.
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Unread postAuthor: BigFootWitness » Tue Jul 31, 2007 2:14 pm

what would be better wading around the chicken, a foam casing made into a shell or should i just somehow fit the chicken in the barrel by fit him in tightly by using a smaller barrel? or exact fit?
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Unread postAuthor: BigJon » Tue Jul 31, 2007 2:41 pm

Why do you want to shoot rubber chickens anyway?

I don't know if this helps but I saw some people using them with water ballon launchers once. But I'm not sure you would get 100 yards with one.
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Unread postAuthor: BigFootWitness » Tue Jul 31, 2007 3:01 pm

So what do you guys believe I need to buy to construct this? Please list everything needed for the project.

Thank you!
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Unread postAuthor: origin unknown » Tue Jul 31, 2007 4:52 pm

Get a mauler and then have a 4" barrel for a tight fit so when the lubed chicken comes out it will squeak because it will expand.
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Unread postAuthor: turbohacker » Tue Jul 31, 2007 5:12 pm

Build something like this...
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Attachments
t shirt gun conception2.GIF
Its called a diphram gun and if made from 4" pipe it will shoot your chicken a considerable distance. This shows the inside of the gun and it has an electronic trigger with CO2 setup
<-- This is not a cat avatar

If it walks like a dog, sratches like a dog, and barks like a dog, than its probobly a...-TURTLE, it's a TURTLE!!! Cant you see?!!!

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Thats a beast!
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Unread postAuthor: BigFootWitness » Wed Aug 01, 2007 9:05 am

I'm fine with pushing a button. So Can somebody list what is needed to build this?

Thank you!
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Unread postAuthor: SpudBlaster15 » Wed Aug 01, 2007 10:36 am

BigFootWitness wrote:I'm fine with pushing a button. So Can somebody list what is needed to build this?

Thank you!


No, we do not give out plans on this forum. If you cannot figure out what you require to build this launcher on your own, you should not be building it in the first place.

Read the Spudwiki, and search these forums to figure out how they work, and determine which parts you need based on the knowledge gained through reading.
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Unread postAuthor: Gepard » Wed Aug 01, 2007 11:01 am

Reminds me of that guy that wanted to build a cannon for his pirate ship....

Michael
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Unread postAuthor: jimmy101 » Wed Aug 01, 2007 11:08 am

Very simple gun specifically for the rubber chicken. Use the same pipe for the chamber and the barrel. This works pretty well for large bore guns.

Take a plastic disposable cup (clear or colored plastic, not the Styrofoam kind) down to the local hardware store.

The cup won't fit very far into 2" PVC pipe (if it'll fit at all). So, try 3" pipe. Does the cup fit most of the way into the barrel? If it goes all the way in does it fit reasonably snuggly? If yes you have your barrel + chamber. A 10' length of 3" pipe is about $8. (The PVC pipe should have a pressure rating on it, something like 220 PSIG.)

Get a cleanout adaptor that fits the 3" (or whatever) pipe. One end of this fitting will slide over the end of the pipe. The other end has female threads. Probably cost $2.

Find the matching male-thread plug for the cleanout adaptor. Probably ~$1.

Get a pack of PVC primer and glue (one small can of each package together as a single item, $4).

Locate a piezo sparker. Most hardware stores have'm near the BBQ's. Probably $12 or so. (or try to salvage one from an old BBQ or lighter that has a piezo igniter)

A fan is not required but the performance of the gun will be much better with a fan. So, get a 40mm to 100mm brushless computer fan (5V to 12V). $3 from electronics surplus places, probably $10 from RadioShack. (Or rip the CPU fan out of an old computer). Get a 9v battery and battery clip to run the fan.

Cut the pipe to length. 3' total will work but be fairly low power. 6' should work well with reasonable power.

Follow the instructions with the PVC cleaner and glue to clean and glue the cleanout adaptor to the pipe. Let dry overnight at least.

Screw two screws into the chamber so that they almost touch near the center line of the chamber. I would put the spark about 1/4 of the way from the breech end to the muzzle end of the gun. Use some wire to hook the piezo up to the screws.

Figure out a way to mount the fan in the chamber.

Get a can of Axe (or other spray that uses propane and/or butane as propellant but doesn't include a lot of other crap like paint). Better yet, use a Benzomatic propane torch or a disposable butane lighter.

(A)
Take a disposable plastic cup (the clear plastic kind, not the Styrofoam kind) and push it into the barrel till it stops. Use a razor or sharp knife to cutoff whatever doesn't fit in the barrel. The part that fits in the barrel is your sabot.

Take the sabot out and flip it over so the open end of the cup points towards the chamber. Use a stick to push the cup halfway down the barrel. This gives a 1:1 C:B ratio which is fine. Drop rubber chicken in barrel. (If needed you can take another plastic cup and cut it like the first one then insert into the barrel open end towards the muzzle, this is a great way to fire water balloons and other small fragile objects.) If the cup won't stay in place you can screw a 1" or 2" screw into the pipe at the proper place to make a stop to catch the cup.

Squirt fuel into the chamber then screw on the cleanout plug. Run the chamber fan for a few seconds.

Point down range and push the Piezo's button.

Retrieve the chicken and repeat from (A).
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