TM 1-320  8  AIR CORPS  cross section.  K  for a concave hemisphere  is  about 0.00389 (see  fig. 7).  ( 4)  Oonvero hemisphere.- For a hemisphere with the convex side  facing the direction of motion or pointing against the wind the  resistance is much less than for the concave hemisphere shown  in  figure 7.  The resistance of the convex hemisphere is much less than  t.hat of a flat plat of the same cross section or exposed area.  Th~  coefficient of resistance is found to be about 0.00082 (see fig. 8}.  18  FIGURE 9.-Air stream flowing by a sphere.  FIGURE  ~.- Ai r  stream flowing by a convex hemisphere.  Jl’louam  7 .-Air stream tlowing by  a  concave hemisphere.  :  - :  X= .00389  x  =  .oooea  X= .0008 