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1. Design the paper plane to be heavier at the nose. This helps to ensure forward Center of Gravity (CG) to prevent the paper plane from stalling in the air. This can be done using the following techniques :
Make multiple folds at the front of the paper airplane. This technique was used by Ken Blackburn in his world record paper airplane.
Clip the nose of the airplane with a paper clip.
2. If your airplane tend to nose-dive due to heavy nose, bend the edge of the wing upwards slightly.
3. Design the paper airplane with rudders at the wing tips. This is a common feature in many paper airplane designs. Having the rudders will help to reduce airplane yaw and thus prevent it from flying in circles and helps the airplane to fly straight.
4. Add more creases to the wings to provide greater stability and lift.
5. Design your paper airplane with sufficient dihedral. Dihedral is the angle formed by the wings across the top of the fuselage. The airplane flies best with its wings horizontal in flight. This is general achieved when the dihedral forms a small V-shape as you hold the fuselage in ready-to-throw position.
So when your paper airplane does not fly well, adjusting the dihedral can help to enhance the performance dramatically. When holding the paper airplane, the dihedral should look like the image below (viewed from the front).
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