Ok. Thank you I will have to really think about this one. lol I have been doing trial and error to get the size I need. It needs to be 6 3/4 " finished pinwheel block. Odd size, I know. Thru trial and error I have come up with these meas.
Starting squares need to be 5 3/8"
The starting squares are 1 3/8 smaller than the finished pinwheel block. Whew!
I don't know if that goes for every size. I don't think so but that's another day.