196 lines
11 KiB
Plaintext
196 lines
11 KiB
Plaintext
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PFM1 - Pocket Sized Flame Thrower
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First Published by Information Unlimited
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Transcribed to the electronic media by Thallion of WUFO MCMXCIV.
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The following plans show how to construct a hand-held device
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intended for burning out insect nests such as wasps, ant hills, cocoons,
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maggots, tent caterpillars, gypsy moths etc. It may also be used to ignite
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rubbish piles, brush, leaves etc. This device like many with similar use
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and capability can be a dangerous weapon in the wrong hands. It should not
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be assembled unless the builder is thoroughly aware of the hazards
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involved.
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Range of this device is dependent on the chemical and the nozzle
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heads used. Usually a tight stream can have a range in excess of 20 inches,
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(similar to a toy water pistol) while a wide vaporous stream may only be
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effective up to five inches, but can create a virtual wall of fire and
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flame. *DANGER* A wind or stiff breeze blowing towards the user can produce
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disastrous results with the stream being in the form of a mist.
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Example of fuel for the device can be the highly flammable diethyl
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ether. This is often used for starting stubborn gas engines and is
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extremely hazardous both to the user and his surroundings. Ether has a low
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flash temperature and is highly explosive and flammable.
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Theory of Operation: REF FIG 1, 2, 3, 4 [See GIFs (POCFLAM1-4.GIF)]
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Construction is shown as a pistol configuration with fuel source (FUC1)
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being placed in the handle (HA1). The electronic ignition (PSHK10)
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[Schematics in GIF 5] along with the battery is housed in the rear of the
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barrel (BR1). When (AA1) actuator arm activates (S1) contact along with the
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valve on the fuel source (FUC1) the fuel now spews out of nozzle (NOZ1).
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(S1) energizes the ignitor and a spark discharge at electrodes (EL1,2)
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ignites the fuel stream.
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The mechanical parts are indicated on a separate sheet [Found as GIF 1-4]
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and are those used for our laboratory prototype. Rather than explain the
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particular pieces we will describe their function instead so that the
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builder may use his own ingenuity in his implementation when constructing
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various configurations of the device.
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FUC1 - The fuel can may be a fresh can of the appropriate size depending
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on the builder's desires. We used a [number missing] oz can of
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WD40 available through your local hardware store.
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*DANGER* We must warn the builder of the hazards involved using WD40 or
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other similar chemicals. Certain low flash point solvents and
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fuels must be treated with caution! Fig 1 [= GIF 1] shows a
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reusable can fitted with a pressure valve for recharging. For
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maximum results a freon gas must be used as propellant, as
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compressed air will not liquefy at the low pressures used.
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CO1 - Small piece of copper soldered to can as shown in Fig 1, 2, 3
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[= GIF 1-2-3] for switch contact abutting screw and spring
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combination.
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AA1 - Actuation arm can be any suitable insulating material that can be
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easily worked as shown in Fig 2 [= GIF 2]. We used a plastic
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electronic tuning tool and fabricated it as required.
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CA1, 2 - Shims so that FUC1 can will fit into appropriate enclosure. May
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use layers of glass fiber tape etc. to allow a snug fit.
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SPR1 - Small spring and screw/nut combination for contacting CO1 copper
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abutment. We used a spring found inside a ballpoint pen.
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BLK1 - PVC head block must be insulating material and snugly fit into BR1
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barrel. We used a block of PVC drilled and tapped for nozzle screw
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and plastic tube TUB1 from fuel can.
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NOZ1 - Nozzle screw 6-32 x 1/4" soft metal for drilling a 0.05 hole
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lengthwise. The metal face protects the plastic head block from
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the flame.
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HA1 - Handle appropriate of plastic and metal tubing. We used a 2" OD
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plastic pipe with 1/4" wall.
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BR1 - Main enclosure, same material as handle. Select for easy
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fabrication.
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ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿
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³ MECHANICAL PARTS LIST ³
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ÃÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ´
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³ Note: These are the materials we used for the lab prototype - ³
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³ You may use your own ingenuity. ³
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ÃÄÄÄÄÄÄÄÄÂÄÄÄÂÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ´
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³ Part ³Qt.³ Description ³
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ÃÄÄÄÄÄÄÄÄÅÄÄÄÅÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ´
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³ FUC1 ³ 1 ³ Fuel can (see text, Fig1) ³
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³ CV1 ³ 1 ³ Check valve for pressurizing - Also obtain removal tool ³
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³ ³ ³ for insert. Use tire type or mating fittings to charging ³
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³ ³ ³ supply, such as sir hose etc. ³
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³ CO1 ³ 1 ³ Copper contact plate - small piece of thin copper ³
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³ CA1,2 ³ 2 ³ 1-1/2" Plastic caps ³
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³ AA1 ³ 1 ³ Plastic actuator arm - use tuning wand or equivalent ³
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³ SPR1 ³ 1 ³ Small spring from ballpoint pen or equivalent ³
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³ SW1/NU1³ 1 ³ 4-40 x 3/4" Screw and nut ³
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³ LUG1 ³ 1 ³ Small solder lug ³
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³ WR1 ³ 1 ³ #24 Hook up wire ³
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³ WR2 ³ 1 ³ #18 Buss wire for spark gap electrodes EL1,2 ³
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³ BLK1 ³ 1 ³ PVC block 3/4 x 1 x 1-1/4" Fabricated per text Fig3 ³
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³ NOZ1 ³ 1 ³ 6-32 x 1/4 Aluminum or brass screw. Fabricated per text ³
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³ ³ ³ as shown in Fig3 ³
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³ HA1 ³ 1 ³ Handle ³
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³ BR1 ³ 1 ³ Enclosure ³
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³ BK1 ³ 1 ³ Bracket ³
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³ SW2 ³ 1 ³ Screw ³
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ÃÄÄÄÄÄÄÄÄÁÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ´
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³ *Reference* US Patent # 4.220.443 ³
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ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ
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PART 2: The electronic ignition (PSHK10)
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----------------------------------------
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Circuit Description:
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A high frequency self oscillating inverter circuit comprised of switching
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transistor (Q1) and step up transformer (T1) produces a high voltage high
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frequency at the secondary winding. This high voltage AC is rectified by
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diode (D2) and charges up storage capacitor (C3 or C4) thru current
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limiting resistor (R4). When this voltage charges up to breakdown potential
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of SIDAC (SID1), the energy stored in the capacitors is "dumped" into the
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primary of high voltage pulse transformer (T2) producing a high voltage
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pulse at the output terminal.
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A charging circuit consisting of current limit resistor (R1) and rectifier
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diode (D1) allows external charging of battery (B1) when NiCad or other
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rechargeables are used.
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The oscillator circuit utilizes a winding on T1 to produce the necessary
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positive feedback to the base of Q1 to sustain oscillation. Resistor R2
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initiates Q1 turn on while resistor R3 and C2 controls the base current and
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operating point.
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Test unit as per the following:
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-------------------------------
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A Position bare end of ground return lead (GRD RTN) so as to allow a
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1/2" to 3/4" air gap between output pin of T2.
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B Connect 10V (8 AA NiCads at 1.25 volt each) to battery.
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C Note with S1 open you should note a fast pulsing action producing a mild
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bluish discharge. This can cause a very mild electrical shock and could
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be safely used within reason as a prank etc.
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D Note with S1 closed a thick slow pulsing discharge. This can produce a
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painful shock and is intended for use against animals etc. For use in
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this Pocket Flame Thrower, you could exclude S1, and put a permanent
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electrical lead there so that it is always set to "On", thus always
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producing a better spark.
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E Current draw with unit properly operating should be approximately
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250 mA.
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F Check power tabs of both Q1 and SID1. These should be cool to warm to
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the touch. Are they really hot, then something is wrong.
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G You may verify proper operation using a oscilloscope noting the
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waveshapes as shown in [GIF 5].
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Note: Input is shown operated with 8 NiCad cells in series for a total of
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10 VDC. Unit however reliably operates within 6-14 VDC.
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If the circuit does not oscillate, try reversing one of the windings
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connections on the primary windings on T1.
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ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿
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³ (See POCFLAM5.GIF) PSHK1 - PARTS LIST ³
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ÃÄÄÄÄÄÄÄÄÄÂÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ´
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³ R1 ³ 100 ohm 1/4 watt resistor ³
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³ R2 ³ 4.7 Kohm 1/4 watt resistor ³
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³ R3 ³ 470 ohm 1/4 watt resistor ³
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³ R4 ³ 2 x 47 Kohm 1 watt in parallel for approx. 24 Kohm. ³
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³ C1 ³ 10 MFD 16volt Electrolytic Capacitor ³
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³ C2 ³ 0.047 MFD 25volt Paper Capacitor ³
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³ C3 ³ 3.9 MFD 350volt Paper Capacitor ³
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³ C4 ³ 0.47 MFD 250volt Polyester Capacitor ³
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³ D1 ³ 1N4001 50volt Diode ³
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³ D2 ³ 1N4007 1KV Diode ³
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³ Q1 ³ MJE3055T NPN Power Transistor (Any 3055 will do) ³
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³ SID1 ³ SIDACTOR K3000 FL 300 volts ³
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³ T1 ³ Self wound ferrite transformer Prim: 2x8T Sec: 1x350T ³
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³ T2 ³ 25KV pulse transformer ³
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³ (S1) ³ (Small SPST slider switch) ³
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³ J1 ³ 3.5mm Jack for recharger ³
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³ CL1 ³ Battery Clip ³
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³ PB1 ³ Perfboard 3-1/4 x 1-1/4 ³
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³ WR1 ³ #24 Vinyl hook up wire ³
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ÀÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ
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