Sampler Quilt 2011 - Week 19 - Old Windmill

The Old Windmill block is made up of 16 half square triangle units using a background with another fabric.
The instructions will use the square method of making half square triangles by adding ⅞ inch seam allowance to the desire finished square size of 1½ inches. You may round up your cut square measurement to 2½ inches, then just square up units to 2 inches.

Old Windmill quilt block

I've just finished the latest quilt block calculator - Old Windmill - which is entirely half square triangle units. You have the option of making the units with squares or using a right triangle ruler to cut them from strips. Once I learned how to use the right triangle rulers, I was hooked. You no longer have to figure out the weird seam allowances - just add 1/2 inch, cut a strip and cut out triangles.