The Stash Builder Box November Block of the Month is the Old Windmill. This block is known by many names such as Double Pinwheel, Windmill or Whirligig. It’s an impressive looking block, but it can be easily made by most quilters, even beginners. If you have never worked with quarter square triangles, this is a great block to practice your technique, since it is made up of 4 sets of them.
All seam allowances are ¼”. The finished block will be 9” so that it will fit with all of your other Stash Builder Box Blocks of the Month.
Fabric A: Cut 2- 5 ⅜” squares (cut in half diagonally)
Fabric B: Cut 1- 5 11/16” square (cut in quarters diagonally)
Fabric C: Cut 1- 5 11/16” square (cut in quarters diagonally)
*Tip* To cut fabric B and C into quarters, cut one diagonal corner to corner. Without moving the fabric, turn your mat, and cut the other diagonal corner to corner.
1. With right sides together, place one Fabric B triangle on top of a Fabric C triangle. Stitch according to the photo below.
*Tip* Pay attention to the placement of the two triangles. When the units are opened up after stitching, they should all be identical.
2. Press the triangles flat, then open and press the seam to the dark side.
3. Make sure the long side is straight. If not, trim to straighten.
4. Repeat steps 1, 2 and 3 for the rest of the Fabric B and C triangles.
5. With right sides together place one quarter triangle unit on top of one Fabric A triangle. Stitch along the long side.
6. Press flat. Open and press the seam toward Fabric A.
7. Repeat steps 5 and 6 for the remaining units.
8. Trim units to 4 ¾” squares.
9. Assemble the rows according to the photo below.
10. Stitch the rows together. Press the seams on the top and bottom rows in the opposite direction so that they will nest.
11. Sew the two rows together.
12. Open and press the seams flat.
13. Trim the block to 9” square.
Once your block is finished, snap a photo and share it on social media using #BOTMSBB. We can’t wait to see your creativity!