The Air Castle Quilt block uses half square triangles, three-quarter square triangles, and the center is a square in a square block. It is a nine-patch layout. The different angles provide a lot of visual interest that you can switch up just by use of color and value.
The earliest history of this quilt block is a pattern by the Ladies Art Company. The Air Castle quilt block was pattern number 101 which was in print in 1895. The Ladies Art Company is credited as the first mail-order quilt pattern company. Another name for this quilt block is Towers of Camelot. (Source: Encyclopedia of Quilt Blocks by Barbara Brackman)
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Fabric Cutting Directions for Air Castle Quilt Block
The traditional Air Castle Quilt Block uses four (4) fabrics, one light, one dark and two medium value fabrics. Fabric 1 is for the center square-in-a-square block and for half square triangles in the corners. Use Fabric 2 in the quarter square triangle blocks at the center sides. Fabric 3 is in the quarter square triangle blocks at the center sides. Fabric 4 is the lightest fabric and is the background in the corners, sides and around the center square-in-a-square.
Since this is a nine-patch block, the finished sizes are easiest when they are divisible by 3. Here is a chart that details fabric cuts for popular sizes of finished blocks.
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