Even though it is a plane for beginners, the Nakamura Lock is truly fun to make and fly. This is the plane what I recommend to start with first because it's the most simple design. Hence the name, it has a simple locking technique on the underside, which holds the flaps together. The Nakamura needs some upward wing angle when flying (If you speak in scientific terms, wing angle is also called dihedral angle). If the plane pitches downwards, then curl the backs of the wings upwards.
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Nakamura side view
(1) Start with regular printer paper, fold in half.
(2) Unfold.
(3) Fold top left corner to the center in a diagonal direction.
(4) Repeat on the other side.
(5) Fold the bottom of the flaps and let tip of triangle match with center crease
(6) Estimate where your locking mechanism will be.
(7) Unfold the lock.
(8) Fold the right top corner to the center.
(9) Match left corner with right corner.
(10) Fold the lock upwards, overlapping the flaps.
(11) Mountain fold in half.
(12) Fold the wing by matching leading edge
 
(13) Flip over and fold other wing.
(14) Open the wings.
Finished Nakamura Lock.
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