Another Michael Siems publication from 1995. This
is an oversized soft cover German language book with a
vintage triFly mounted on the cover. This book also
has a stiff cardboard center with scored lines for
cutting out and making your own cross stick boomerang.
Has really good instructions for working with triFlys.
Also tells you how to tune, make a traditional
boomerang, airfoiling, throwing, etc. Also has a photo
gallery and plans for different models.