Paper Airplanes!

The Dart

Step One
Use a sheet of 81/2-by-11 inch paper. Fold the paper in half lengthwise and run your thumbnail along the fold to crease it sharply. Now, unfold the paper, and fold down the top corners as indicated by the arrows.

Step Two
Fold the two edges toward the center line, as indicated.

Step Three
Turn the plane 90 degrees as shown in figure, make a valley fold in half.  
Create a wing crease that begins at the nose as shown with the green line. Note that   A=B. 

Step Four
Fold down the sides along the green line shown in the previous step.

Step Five
The Basic Dart is complete. 
Bend up the tailing edge of the wings for lift if it has a tendency to nose-dive.

The Delta Fighter

Step One
Use a sheet of 8½-by-11 inch paper. Fold the paper in half lengthwise and run your thumbnail along the fold to crease it sharply. Now, unfold the paper, and fold down the top corners as indicated by the arrows.

Step Two
Fold the two edges toward the center line, as indicated.

Step Three
Turn the plane 90 degrees as shown in figure, then fold in half. 
Create a wing crease that begins at the nose as shown with the green line. Note that A=B.  

Step Four
Fold down the sides along the green line shown in the previous step. 

Step Five
Unfold the plane as shown.  Crease as shown with the red line.  Note that one end is about 5 cm from the nose and the other end should be barely touching the blue creases. 

Step Six
Fold both green sections to the side. Fold in half, and repeat the step 3 and 4.

Step Seven
Give the model a three- dimensional shape. 
Put a small piece of tape across the top of the wings to keep them from separating. Bend up the tailing edge of the wings for lift if it has a tendency to nose-dive.