| Method |
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1 Draw a circle in 70mm diameter and divide
the centre into same angle (45°) with 4
straight lines.
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2 Put upper and lower rotor on the circle
one by one. |
3 Mark the edge of the cup on the lines with
a marker. |
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4 Make eight straight slits to the bottom
of the cup with a pair of scissors.
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5 Cut off outer edges of rotors. |
Compare the angles of the folded wings between
upper and lower rotors!
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6 Fold each upper rotor wing. Make sure to
lap the circumference of the bottom of the
cup and each folded wing parallel.
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7 Fold wings of lower rotor. Fold the wings
different direction compared to the upper
rotor. |
8 Finished upper rotor (yellow) and lower
rotor (blue) |
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9 In order to make the body helicopter cut
a plastic straw in 12cm length.
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10 Make two V shape cuts on opposite edges
of the straw. |
11 This end becomes lower edge of the body.
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12 In order to make a rubber band stopper.
Cut bamboo stick with a cutter then make
a 2cm stick
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13 Make a circular plastic sheet in 14 to
15 mm diameter from a strong Fanta
plastic
bottle then make a hole in the centre
of
the sheet with a compass needle. The
hole
should be bigger than the diameter
of the
clip wire.
|
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| 14 Unfold an office clip and cut it into
two wires with nippers. |
15 Take one piece of wire then make a small
hook with pliers. |
16 Pass the hooked wire through the plastic
circular sheet and a bead.
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17 Make a hole with the compass needle in
the centre of the upper rotor.
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18 Pass the hooked wire through the hole.
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19 Bend the wire in 90 degree twice with
pliers. |
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| 20 Make a hole with needle in order to pass
through end of the wire. |
21 Pass the end of the wire through the hole
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22 On the opposite side of the upper rotor
bend the end of the wire.
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23 The hooked wire is fixed on the upper
rotor.
|
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| 24 Make six slit in the centre of the lower
rotor as above pictures shows. |
25 Make two 9mm x 50mm insulation tape slips
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| 26 Make lower rotor stopper with a tape slip.
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27 Push a sharpen pencil in the centre of
the slits from the back side of the lower
rotor. After removing the pencil, push the
straw through the rotor until it stops at
the stopper.
|
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 |
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| 28 Wind and stick another slip around upper
part of the lower rotor. |
29 Hook a rubber band with a wire or connect
a string with the rubber band. |
30 Connect the rubber band with hooked wire
of the upper rotor then pass the wire
through
the straw.
|
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 |
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| 31 Fix the rubber band with bamboo stick
stopper and remove the wire or the string.
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32 Hold the upper rotor with your right hand
and rotate the straw anticlockwise with left
hand more than 50 times. |
33 After winding the rubber band, hold the
helicopter vertically and release it into
the air.
|
Rubber band helicopter (Rubber band
propelled
helicopter, Rubber band powered helicopter)
Copy right JICA Senior Volunteer Hideo Nakano (Aug 2005)
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