Yesterday Eliud Kipchoge became the first human to run a marathon distance in under two hours. Part of what allowed him to do it seems to have been that he had pacers running along with him to break the wind. These pacers ran in a strange formation like a "Y:"
Kipchoge is the white circle. Is there any explanation of how this was arrived at? Was it purely empirical? Is there some physical way to understand why this would be a good formation, from the point of view of fluid dynamics? The inversion of the wedge is very counterintuitive to me.