272 lines
12 KiB
Plaintext
272 lines
12 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
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generated by the conversion of dry ice into gaseous carbon
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dioxide. The most common use that I have seen is the dry ice
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bomb. The dry ice bomb is easily made by using a two liter
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plastic bottle, some hot water and some crushed dry ice. To
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make one, one simply puts about a cup and a half of crushed dry
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ice into the bottle, adds hot water, caps the bottle and throws
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it. These bombs are not a joke, and have been known to blow a
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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
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throw it before it explodes due to the enormous force generated
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by the explosion of the bottle. A friend of mine waited a bit
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too long on throwing one, and he jammed three of his fingers
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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
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shoes and cut his foot all to hell. In short, be careful with
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these things.
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One day in May of 1985, an idea was introduced to me by a
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friend. His plan was to control the force of the expanding dry
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ice and harness it to a useful end. The result was the dry ice
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gun. In following these plans, please keep in mind that when dry
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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
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and when disarming it, you hold all valves OPEN, and that you
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wear a pair of protective goggles at all times. I will take no
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responsibility for injury that occurs because of the content of
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this file, or through the use of this information. This
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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
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because of the nature of the construction itself and the effect
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produced by using different parts. The following parts, however,
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are necessary for a gun with moderate power and range:
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1- Standard valve. I recommend the kind that is just a
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lever and turns 1/4 turn to open or close and has 3/4"
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connectors.
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1- Blow gun (These can be found at auto parts stores... shop
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around a little and get one with the highest pressure
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rating you can find (probably 150 PSI)). This will be
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sometimes referred to as a valve also.
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1- Length of hot water PVC piping...this will be used for
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the barrel. I recommend that you use 3/4" piping,
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because that is the kind that fits paint pellets of the
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type used in KILLER best. Note, however, that it is
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possible to launch anything up to the size of an egg with
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pleasing results, provided that the barrel is large
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enough in diameter.
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You will also need various lengths of regular lead or steel
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piping (to construct the actual gun), and adapters to get the
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blow gun to fit the rest of the gun (blow guns usually have
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connectors that are 1/4" in diameter, while the rest of the gun
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(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
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your dry ice 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
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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
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not possible. However, a diagram of the gun will give you an
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idea of what has to be done, and construction tips should prove
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enough to allow successful completion of the 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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!______________________!/ / : : \!___I__!__ \
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joint B____________/ : : : I \ \
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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
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about 6 inches long by 2 inches in diameter. The larger
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the chamber is, the more shots the gun will fire before
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reloading is necessary.
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2- The elbow joint can be left out...it will only make the
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gun in the shape of a straight rod rather than a
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"traditional" gun shape.
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3- The barrel length can be any length you like, but very
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long ones are cumbersome and very short ones don't allow
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much accuracy. I recommend a length of about 2 1/2 to 3
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feet.
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4- all joints except the two marked 'A' and 'B' should be
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tightened as much as possible and sealed by coating the
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threads with the form-a-gasket and then putting the two
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pieces together and tightening them as much as possible.
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If you like, you can also caulk around the finished and
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tightened joint.
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5- The joint marked 'B' should be tight, but DO NOT SEAL IT
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unless you do not intend to ever use more than one kind
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of barrel.
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6- The joint marked 'A' should not be sealed with form-a-
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gasket like the others because it is the one that you
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will be filling the dry ice into the gun through. To
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fill the gun with dry ice, detach the dry ice chamber
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pipe from the elbow joint. Load the container with as
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much crushed dry ice as it will hold. Then, coat the
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threads of one of the pieces of the joint with pipe
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dope. This will prevent leakage of the carbon dioxide
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after it has changed into gaseous form.
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7- The pressure chamber should be about 1 1/2 inches in
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length for a fairly powerful gun. The longer the
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pressure chamber is, the more powerful the gun. On
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a gun with a three inch pressure chamber, we shot a
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AA battery 500 (yes, hundred) feet across a parking
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lot. Such high power, however, is dangerous, and is
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not recommended for use in games such as Killer, but
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rather for target 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
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thing you must do is to open the standard valve and immerse the
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gun in water. This is to check for leaks. If any leaks are
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present, they will show up as streams of bubbles rising from the
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gun. If any are found, tighten the offending joint and put the
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gun back in the water. When all leaks are gone (if necessary,
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take the whole thing apart and rebuild it from scratch to
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eliminate leaks, especially on either end of the pressure
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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
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a 'woosh' sound, and the gun should kick slightly. This
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indicates that all is working properly. When loading the dry ice
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gun, it is important to keep both valves OPEN until the dry ice
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container is secure, and then close both valves. Even after you
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are sure that the gun has no leaks anywhere, it is good to
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immerse the dry ice container (while it is attached to the gun)
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in water. This warms the dry ice and causes it to change into
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gaseous carbon dioxide.
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After the dry ice container has been immersed for 5 minutes
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or so, remove the gun from the water and dry it off. The gun is
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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
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place the projectile (I recommend paint pellets) in the barrel
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of the gun, open the standard valve for about a second and
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then close it. You should hear a muffled rush of air as some
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of the gaseous CO2 is bled into the pressure chamber. Aim the
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gun at who/whatever you wish to hit, and squeeze the trigger.
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For more power, you can leave the standard valve open and squeeze
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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
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hear the pressure escaping through the barrel of the gun. Then,
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unscrew the dry ice container and place it in cold water for
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about 3 to 4 minutes, or until all of the remaining dry ice has
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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
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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
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to replace the pressure chamber pipe with a "T" joint and valve
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so as to make a gun with long, medium, and short range
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capability. To do this, construct the pressure chamber section
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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
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length. The following chart shows the combinations in which the
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valves may be used to create 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
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above procedures. Have fun!
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This file may be used on any system as long as all credits and
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information remain intact.
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=================================================================
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