Double a
piece of paper and cut out of both folds simultaneously a figure of the
shape indicated by the solid lines in the diagram. The portion A is square,
and forms the head weight; B indicates the front planes, C the rear planes.
Bend the upper fold of each pair into the positions B1, C1, marked by
dotted lines. Their front edges make less than a right angle with the keel,
to ensure the wings slanting slightly upwards towards the front when
expanded.
The model is now turned over, and the other wings are folded exactly on top
of their respective fellows. Then the halves of the head are folded twice
inwards, to bring the paper into as compact a form as possible. It remains
to open out the wings at right angles to the keel, and then raise their
tips slightly so that the two planes of a pair shall make what is called a
"dihedral" angle with one another.
[Illustration: FIG. 128.--Details of paper gliders: Model "B" above,
Model "C" below.]
Before launching, look at your model endways and make sure that the rear
planes are exactly in line with those in front. It is essential that they
should be so for straight flight.
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