Ricky Tims introduced the one seam flying geese ten years ago on The Quilt Show and I thought it was the best thing. I started making them that very day. He was shown how to do it from a group of quilters in England.
https://www.youtube.com/watch?v=78Mu0C_QL8Y
Suzanne McNeil has two books using this technique. The Five Minute Quilt Block
https://www.youtube.com/watch?v=TIxl3af3lzY and the The Ten Minute Quilt Block.
https://www.youtube.com/watch?v=ZbTHlGGKMPM
I taught how to make the Five Minute Quilt Block at a retreat. Fastest class I ever had. LOL
Here is a chart of sizes for the OSFG
https://secureservercdn.net/166.62.1...ing-chart1.pdf