Origami Waterbomb Base

Besides that waterbomb, this basic form is the starting point for many origami models.  The frog, flowers, and a few airplaces all start with this shape.  Many model directions simple say "fold a waterbomb base", and it involves two valley folds and a single mountain fold, and yields a triangle.  These simple directions will get you well on your way to making waterbombs.

Valley fold the bottom right hand corner up to meet the top left hand corner.  A valley fold is the only fold you can make with the paper laying flat on the ground.  It forms a shape like a valley.  Make a good crease, and unfold.

Valley fold the bottom left hand corner up to meet the top right hand corner.  Make a good crease, and unfold.

Mountain fold the top half to the bottom.  A mountain fold is accomplished by turning the paper over, and then valley folding.  Make a good crease, and unfold.

Turn your model back over, and stand the mountain up.  This is a great picture to explain a mountain fold.

Put your finger on the middle of the paper and push straight down until the corners "pop" up.

The folds will naturally collapse into a triangle shape, four layers thick.

Here is the complete waterbomb base.  There are four flaps to the triangle, and with a little work you can make this stand up.

With that under your belt, you are ready to make a waterbomb, one of my favorite toys.