104 lines
4.5 KiB
Plaintext
104 lines
4.5 KiB
Plaintext
bombcb.txt
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CARDBOARD TUBE BOMBS
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The following instructions explain how to make a pyrotechnic device that
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makes a hell of a lot of smoke and noise, yet emits only a relatively
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minor amount of shrapnel.
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The best size of cardboard tubing to use for this device is from 1/4"
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inner diameter to a maximum of 1/2" inner diameter. The walls should be
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about 1/10" to 1/4" thick.
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Tools
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safety goggles
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hot glue gun
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power drill or dremel tool
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drill bit to fit your fuze wire
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knife
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ceramic coffee cup
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Materials/Supplies
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Pyrodex RS or Pyrodex P gun powder
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green hobby fuze wire
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thin cardboard tube (less than 1/2")
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hot glue sticks
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scotch tape
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SETUP
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Put on your safety goggles. Do not proceed any further until you have
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some kind of eye protection available.
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Lay out a clean work area, and protect the surface you're working on with
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either newspapers or old sheets.
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Plug in the hot glue gun and set it somewhere to warm up safely.
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Pour out a small amount of powder into the coffee cup. You want to keep
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this amount as small as possible, in case of accidental detonation.
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CONSTRUCTION
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You are now ready to begin making bombs! For starters, I recommend 3" to
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4" of cardboard tubing. Use a knife and make a CLEAN cut at both ends of
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the piece of cardboard. My favorite cardboard is that found on some
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brands of clothes hangers. You can use other rolls.
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Using either a drill or a dremel tool, drill a single fuze hole exactly
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midway down the tube. This hole should fit as tightly around your fuze
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wire as possible, so depending on the size of the fuze wire, use an
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appropriately sized bit.
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Cut a length of fuze wire (4 inches is usually sufficient). Place just
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the first 1/10" inside the fuze hole. Using the hot glue gun, carefully
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squirt a small bead around the fuze right up against the fuze hole. This
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is to seal the fuze hole, as well as to firmly attach the fuze to the
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device. When you have squirted the little bead in place, twist the fuze
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around, slowly sliding it into the case while continuing to twist it.
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This will tend to draw the glue into the case, which will make a very
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solid fit and good seal.
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When the fuze is all the way in (pressed against the far side of the case
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opposite the fuze hole), it's time to begin charging the device. Put a
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little piece of scotch tape over one end of the tube (doesn't matter
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which). Make sure no powder can leak out past this tape, and then pour
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powder into the open end. Make sure the powder is able to fall past the
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fuze wire sticking through the tube. Fill the tube completely.
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When the tube is completely full of powder, tap the tube to allow the
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powder to settle a little bit. When it has stopped settling, carefully
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pour out a little bit of the powder. The amount of space you want free at
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the top of the tube should be approximately 2 or 3 times the diameter of
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the tube. Any less than this will not allow for a strong end seal.
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Sticking the nose of the glue gun into the open end, squirt in enough glue
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to fill the end, stopping when you have a blob of glue sticking out the
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previously open end of the device. Before going any further, you must
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wait for this glue plug to cool and solidify. I find this is a good time
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to start working on my next device, and I tend to round-robin two or three
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of them, so that I have no waiting while the glue cools.
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When the glue has cooled, turn the glue end down and carefully peel back
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the scotch tape. At this end you want to repeat what you did before,
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pouring out enough of the powder to accommodate a glue plug.
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When the second glue plug has cooled and solidified, you now have a
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completed device! For grinners, you can dip the thing into paint, or
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spraypaint it. If you want additional water-resistance, dip the device
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into a thick enamel paint, or some of that liquid rubber/plastic tool
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coating stuff.
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DETONATION
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The most dangerous parts of this device are the two glue plugs at each
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end, as they can fly off with incredible force. Make sure you and others
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are protected from this type of shrapnel.
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If you have water-proofed them with a thick enamel paint, you can even
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toss these devices into swimming pools once the fuze has been lit.
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Good things to launch skyward with these devices include aluminum cans,
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hubcaps, empty paint cans, old shoes, feisty cats, and anything else you
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can fit one of these babies underneath. Have fun!
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