242 lines
11 KiB
Plaintext
242 lines
11 KiB
Plaintext
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[][][] A Step by Step Guide to Making a Dry Ice Gun [][][]
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[][][] [][][]
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[][][] By: The Voice Over [][][]
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[][][] [][][]
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[][][] A Metal Communications Presentation [][][]
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[][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][]
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[][] /\/\etalland 1 10megs/AE/BBS/Cat-Fur [503]538-0761 [][]
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[][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][][]
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Introduction:
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------------
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In the past, many people have experimented with the power generated by the
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conversion of dry ice into gaseous carbon dioxide. The most common use that I
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have seen is the dry ice bomb. The dry ice bomb is easily made by using a two
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liter plastic bottle, some hot water and some crushed dry ice. To make one, one
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simply puts about a cup and a half of crushed dry ice into the bottle, adds hot
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water, caps the bottle and throws it. These bombs are not a joke, and have been
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known to blow a metal trash can fifteen feet into the air, as well as bursting
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the bottom of the can. If you make a dry ice bomb, you had best throw it before
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it explodes due to the enormous force generated by the explosion of the bottle.
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A friend of mine waited a bit too long on throwing one, and he jammed three of
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his fingers badly, got a huge bruise on his left leg, and one of the plasic
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fragments was propelled with enough force to puncture his tennis shoes and cut
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his foot all to hell. In short, be careful with these things.
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One day in May of 1985, an idea was introduced to me by a friend. His plan
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was to control the force of the expanding dry ice and harness it to a useful
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end. The result was the dry ice gun. In following these plans, please keep in
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mind that when dry ice is finished expanding, it can generate pressures of up to
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2400 PSI...for this reason, I recommend that when arming the gun and when
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disarming it, you hold all valves OPEN, and that you wear a pair of protective
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goggles at all times. I will take no responsibility for injury that occurs
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because of the content of this file, or through the use of this information.
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This information is intended for educational purposes ONLY.
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Materials needed:
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----------------
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The materials required will vary for each gun produced because of the nature
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of the construction itself and the effect produced by using different parts.
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The following parts, however, are necessary for a gun with moderate power and
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range:
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1- Standard valve. I recommend the kind that is just a lever and turns 1/4
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turn to open or close and has 3/4" connectors.
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1- Blow gun (These can be found at auto parts stores... shop around a little
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and get one with the highest pressure rating you can find (probably 150 PSI)).
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This will be sometimes referred to as a valve also.
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1- Length of hot water PVC piping...this will be used for the barrel. I
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recommend that you use 3/4" piping, because that is the kind that fits paint
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pellets of the type used in KILLER best. Note, however, that it is possible to
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launch anything up to the size of an egg with pleasing results, provided that
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the barrel is large enough in diameter.
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You will also need various lengths of regular lead or steel piping (to
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construct the actual gun), and adapters to get the blow gun to fit the rest of
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the gun (blow guns usually have connectors that are 1/4" in diameter, while the
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rest of the gun (except the dry ice container) should be constructed with 3/4"
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fittings). You will also need an end cap to go on the end of your dry ice
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container and probably an elbow joint.
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Optional parts:
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--------------
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1- Standard valve (same kind as above, but with a shorter lever).
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1- "T" joint with 3/4" connectors all around.
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1- 6 or 7 inch length of 3/4" diameter pipe.
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1- 3/4" end cap.
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Form-a-gasket and pipe dope
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Construction:
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------------
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Because of the nature of the gun, step-by-step plans are not possible.
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However, a diagram of the gun will give you an idea of what has to be done, and
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construction tips should prove enough to allow successful completion of the
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project.
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Diagram:
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-------
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trigger (part of the blow gun) standard
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adaptor______________ : valve
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\ : \
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: : :
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______________________ : _ ; _____:______ __________
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! !\__ __!__________________________________/ \
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! barrel ! __!__!__! ! O ! \ !
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!______________________!/ joint B____________/: _____________ !
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blow gun_____________/ : : I / \ \ \__________!
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pressure chamber________/ : I / !_____!<-joint A
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adaptor____________________/ / ! !
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elbow joint________________________/ /! !
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dry ice container_____________________/ ! !
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end cap_______________________________ _!_____!_
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\!! !!
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+-------+
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NOTES:
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1- The dry ice container can be any size...the one I use is about 6 inches
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long by 2 inches in diameter. The larger the chamber is, the more shots the gun
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will fire before reloading is necessary.
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2- The elbow joint can be left out...it will only make the gun in the shape of
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a straight rod rather than a "traditional" gun shape.
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3- The barrel length can be any length you like, but very long ones are
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cumbersome and very short ones don't allow much accuracy. I recommend a length
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of about 2 1/2 to 3 feet.
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4- all joints except the two marked 'A' and 'B' should be tightened as much as
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possible and sealed by coating the threads with the form-a-gasket and then
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putting the two pieces together and tightening them as much as possible. If you
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like, you can also caulk around the finished and tightened joint.
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5- The joint marked 'B' should be tight, but DO NOT SEAL IT unless you do not
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intend to ever use more than one kind of barrel.
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6- The joint marked 'A' should not be sealed with form-a- gasket like the
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others because it is the one that you will be filling the dry ice into the gun
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through. To fill the gun with dry ice, detach the dry ice chamber pipe from the
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elbow joint. Load the container with as much crushed dry ice as it will hold.
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Then, coat the threads of one of the pieces of the joint with pipe dope. This
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will prevent leakage of the carbon dioxide after it has changed into gaseous
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form.
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7- The pressure chamber should be about 1 1/2 inches in length for a fairly
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powerful gun. The longer the pressure chamber is, the more powerful the gun.
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On a gun with a three inch pressure chamber, we shot a AA battery 500 (yes,
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hundred) feet across a parking lot. Such high power, however, is dangerous, and
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is not recommended for use in games such as Killer, but rather for target
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practice (on INANIMATE objects).
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How to operate the dry ice gun:
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------------------------------
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Once you have the dry ice gun built and loaded, the first thing you must do is
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to open the standard valve and immerse the gun in water. This is to check for
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leaks. If any leaks are present, they will show up as streams of bubbles rising
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from the gun. If any are found, tighten the offending joint and put the gun
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back in the water. When all leaks are gone (if necessary, take the whole thing
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apart and rebuild it from scratch to eliminate leaks, especially on either end
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of the pressure chamber), release the pressure built up so far by closing the
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standard valve and then operating the trigger. You should hear a 'woosh' sound,
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and the gun should kick slightly. This indicates that all is working properly.
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When loading the dry ice gun, it is important to keep both valves OPEN until the
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dry ice container is secure, and then close both valves. Even after you are
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sure that the gun has no leaks anywhere, it is good to immerse the dry ice
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container (while it is attached to the gun) in water. This warms the dry ice
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and causes it to change into gaseous carbon dioxide.
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After the dry ice container has been immersed for 5 minutes or so, remove the
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gun from the water and dry it off. The gun is now ready to be fired.
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Firing the dry ice gun:
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----------------------
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This is the simplest step of all. To fire the gun simply place the projectile
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(I recommend paint pellets) in the barrel of the gun, open the standard valve
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for about a second and then close it. You should hear a muffled rush of air as
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some of the gaseous CO2 is bled into the pressure chamber. Aim the gun at
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who/whatever you wish to hit, and squeeze the trigger. For more power, you can
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leave the standard valve open and squeeze the trigger.
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Disarming the dry ice gun:
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-------------------------
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To disarm the gun, open both valves until you can no longer hear the pressure
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escaping through the barrel of the gun. Then, unscrew the dry ice container and
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place it in cold water for about 3 to 4 minutes, or until all of the remaining
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dry ice has evaporated. When all of the dry ice is gone, clean the threads on
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the dry ice container and elbow joint, and store the gun in a clean, dry area.
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Suggested modifcations:
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----------------------
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The only really nice modification that I've discovered is to replace the
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pressure chamber pipe with a "T" joint and valve so as to make a gun with long,
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medium, and short range capability. To do this, construct the pressure chamber
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section of the gun like this:
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___adaptor I
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: ______________________________________ ________I___
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_____ _ :/! ! I
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___#__!o!/ ! ! I
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! ! ! I
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! ! "T" joint ! O
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________! ! !
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: \ ! !
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: \!____________ _____________!____________
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: ! ! ^
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: !_____________! !
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:__blow gun !______O______!<-standard standard
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! I ! valve #2 valve #1
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! I !
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! I !<-short length
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_!______I______!_ of piping
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!! !!
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+---------------+
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end cap_______/
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What this does is make a pressure chamber with a variable length. The
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following chart shows the combinations in which the valves may be used to create
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different ranges.
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RANGE ! INSTRUCTIONS
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--------+--------------------------------------------------------
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short ! Open valve number 1, hold it open for about a second,
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! close it, and then open valve #2.
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--------+--------------------------------------------------------
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medium ! Open valve number 1 for about a second and close it.
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! Leave valve #2 closed.
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--------+--------------------------------------------------------
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long ! Open valve #2 before opening valve #1. Open valve #1
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! for about a second, then close it.
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--------+--------------------------------------------------------
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The trigger can be squeezed at any time following any of the above procedures.
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Have fun!
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This file may be used on any system as long as all credits and information
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remain intact.
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=================================================================
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Call The Works BBS - 1600+ Textfiles! - [914]/238-8195 - 300/1200 - Always Open
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