Step 1:
The large papers are 6x6 inches and the small paper is 3x3 inches.

Step 6:
Press the edges downwards.

Step 5:
Fold over this line.

Step 2:
Prefold.

Step 4:
Prefold.

Step 3:
Valley-fold over the two lines at the bottom right, mountain-fold over the two diagonal lines and valley-fold over the two lines at the top left.

Step 10:
Repeat step 9 with the other three flaps.

Step 8:
Bookfold one layer to the left, the fold the flap upwards, do the same on the backside.

Step 9:
Fold the flap into an angle of 45 degrees

Step 7:
Repeat steps 4 to 6 on the backside.

Step 16:
Two sticks get a few extra folds, the blue bar indicates the centerline.

Step 15:
Make 6 of these sticks.

Step 12:
Start with the folding line below.

Step 11:
Use glue or tape to keep the propeller in the right shape.

Step 14:
Use glue or tape.

Step 13:
Now it's easier rolling up the paper.

Step 21:
Done. 

Step 19:
This is the small 3x3inch paper.
Fold in half three times.

Step 20:
Fold in half.

Step 18:
Make two pieces like this one.

Step 17:
Fold over these two lines.

Step 22:
Fold over this line.

Step 28:
Done......

Step 25:
Make two of these tubes

Step 26:
Place two papers on top of each other.

Step 24:
Use glue or tape

Step 23:
Roll up into a tube.

Step 29:
Glue or tape two squares together.
Fold over these two lines

Step 27:
Fold over these two lines

Step 30:
Prefold.

Step 31:
Fold the corners inwards (make the same folds on the backside).

Step 32:
And the tail wing is done too.....

Step 33:
Glue or tape two squares together.
Fold over this line.

Step 35:
Fold the edge inwards.

Step 34:
Glue / tape the upper edge a little above the lower edge (no folding!)

Step 36:
Fold this edge inwards.
Repeat step 35 and 36 on the other side, see arrow.

Step 37:
Make two wings.

Step 38:
The lower wing gets a few extra folds. The blue bar indicates the centerline of the wing.

Step 39:
This is the lower wing.

Step 44:
Glue the dark yellow piece around the stick and tube.

Step 41:
Glue a stick into the back of the propeller

Step 40:
All parts needed for the plane are done.....

Step 42:
Glue the purple piece behind the propeller.

Step 43:
Done.....

Step 45:
Glue two sticks to the back of the tube.

Step 46:
Glue the tail wing around the sticks.

Step 47:
Glue the lower wing to the model.

Step 48:
Glue the two folded sticks to the lower wing.

Step 49:
Add glue to these spots and glue the upper wing to the model

Step 50:
Slide the three parts together