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 Slip Knot quilt block is a bit of an optical illusion, in that it appears that fabrics weave across each other. This is technically an eight patch as it is designed on an 8 x 8 grid, but I like to sew this block as an uneven nine patch because I find it easier to work in "chunks" instead of rows. However, please feel free to construct as you like.
This block contains simple patches -- squares, rectangles, half square triangles and flying geese. The challenge is that there are many pieces, and many seams. So, if you pay close attention to sewing a precise quarter inch seam allowance, you will find this block goes together easily.
The two sample quilts illustrate different versions of quilts set on point, so you are only limited to your imagination to create your own original design. Enjoy!