Origami Helicopter

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  Step 1

  Main Rotor

  The Main Rotor is based on the traditional origami pinwheel. Begin with the hidden (inside) side of the paper facing you. The position of the paper is not important.

  Fold and unfold corner to corner in both directions.

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  Step 2

  Fold and unfold left to right and bottom to top.

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  Step 3

  Fold and unfold each of the four edges to the center.
  The result is a 4 x 4 grid with two diagonals.

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  Step 4

  Turn the paper over.

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  Step 5

  Fold and unfold all four corners to the center.

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  Step 6

  Turn the paper over.

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  Step 7

  Press down at each of the four dots. This curls the four corners up and makes the next few steps easier to do.

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  Step 8

  Fold the top and right edges inward at the same time. This causes a triangular flap to stand up in 3-D where the edges meet.

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  Step 9

  Lay the triangular flap flat to the left.

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  Step 10

  Repeat steps 8–9 on the other three sides, creating a pinwheel. For the fourth side you’ll have to undo the first flap a little.

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  Step 11

  Turn the model over.

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  Step 12

  Fold edge A to the horizontal center crease

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  Step 13

  Unfold step 12.

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  Step 14

  Repeat steps 12–13 on the other three sides.

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  Step 15

  Bring sides X and Y toward the center at the same time. The corner where they meet will pop up in 3-D.

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  Step 16

  Pinch the corner that was created in step 15 so that it pops up fully. Then repeat steps 15–16 on the other three adjacent sides.

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  Step 17

  All four corners are now 3-D. Flatten each side as shown. You’ll have to do this on all four flaps at the same time in order for them all to lie fl at.

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  Step 18

  The completed Main Rotor.

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  Step 19

  Fuselage
  Begin with the hidden (inside) side of the paper facing
  you. The position of the paper is not important.

  Fold and unfold the bottom corner to the top.

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  Step 20

  Fold the edges to the center crease.

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  Step 21

  Fold the top and bottom corners to the dot.

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  Step 22

  Mountain-fold the model in half.

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  Step 23

  Fold and unfold the white triangular portion of the model as shown.

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  Step 24

  Fold the near flap over to the other side.

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  Step 25

  Reverse-fold (tuck inside) the right corner along the crease you made in step 5.

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  Step 26

  Fold the near layer to the left.

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  Step 27

  Fold the bottom corner up to the top.

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  Step 28

  The completed Fuselage.

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  Step 29

  Prepare the Main Rotor for assembly

  Turn the Main Rotor over.

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  Step 30

  Open out one layer of each blade as far as possible.

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  Step 31

  Here is the result.

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  Step 32

  Prepare the fuselage for assembly

  Swivel the triangular fl ap a little
  to the right so that it’s perpendicular
  to the colored portion. Then stand
  the piece upright.

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  Step 33

  Here is the result.

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  Step 34

  Assembly

  Place the corner of the base of the Fuselage on the corner of the center square of the open Main Rotor. The dotted gray triangle shows where the base goes. Two corners of the base will protrude a little beyond the square.

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  Step 35

  Tuck the two protruding tips of the corners under the edges of the center square.

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  Step 36

  Close the Main Rotor back up, wrapping the flaps around the triangular base. As you do this, the base will be forced to lay to the right.

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  Step 37

  Fold the base down, creasing along the inner edge of the Main Rotor.

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  Step 38

  Fold the base to the left so that edge C lies along edge D.

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  Step 39

  Unfold step 5.

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  Step 40

  Reverse-fold (tuck inside)
  the Fuselage along the crease
  you made in step 5.

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  Step 41

  Swivel the Main Rotor up
  so that it is positioned perpendicular
  to the Fuselage.

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  Step 42

  The completed Helicopter. Add
  tail rotor stickers and you’re
  ready to take a whirl over your
  city!

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