Interesting quilt. It looks like a wonky grandmothers fan adaptation with all the fan blocks sewn together to form a circle. If your want to attempt to replicate it, I would recommend using Grandmothers Fan as a starting point for your pattern and simply sew wonky strips at angles for the blades of the fans. Make it over sized so you can trim down to the fan shape. Instead of the outer arc, sew on stips and pieces of light colored fabric forming a rough semi-circle and then square up. Looks like it could be a fun project to try.