You can also cut off uneven and excess bits of paper, but this is risky since you won’t be able to go back.
Fins are useful in more complicated designs. For standard dart planes, they should be avoided since they will slow the plane.
This counterbalances the weight in the nose of your plane.
Most airplanes are better off being slightly nose heavy rather than slightly tail heavy. Heavier planes are better at withstanding outdoor flight.
Non-dart glider planes should be throw upwards gently with a pushing motion.
