Three right angled triangles are all that is needed to create one of these Flying Geese units (or patches.) The largest triangle piece is considered to be the "geese" piece -- (why it is not called a "goose" piece is beyond me). The other two identical triangles are considered to be the "sky" pieces.
Flying geese units are probably the third most commonly used patches in quiltmaking -- following the square and the half square triangle.
Free Quilt Block Pattern
The Double Star quilt block is comprised of two star units -- one star inside the other. The stars are each a Sawtooth Star which is a popular quilt block all on its own. This block takes the Sawtooth Star to a new level.
The Double Star is comprised of lots of flying geese units and could be considered an intermediate level quilt block due to the number and size of the individual pieces. However, by taking care with sewing an accurate quarter inch seam allowance, this quilt block will be together in no time.
See also ~ Double Star #2