To figure 8 we have also added wind-tunnel data from [3] that appeared in figure 6, as
well as our Teamgeist data from figure 7. Note that all of the wind-tunnel data were taken at
large enough Re and small enough Sp that both sides of the ball likely experienced turbulent
separation. Just one set of our data, for Re 3 × 105, sits in that region. Our two low-spin
tests are either in or just slightly above the region associated with both sides of the ball having
laminar separation. The rest of our tests fell in the middle region. It is thus no surprise to us
that the CL values in figure 7 level off as Sp increases