Tables 1 62 and 1 63 201 



TABLE 162. — Forces on Spheres 



For spheres the linear dimension L is taken as the diameter of the sphere D 



and the area as — — . For values of the Reynolds Number between 80,000 and 



4 

 300,000 the value of C depends in large measure on the turbulence of the air 



stream (cf. Technical Report 342 of the National Advisory Committee for 

 Aeronautics). The curves marked S and W most clearly approximate the con- 

 dition of zero turbulence. 



Air Forces on Spheres. 



Force = F = CAq. A=nD 2 /4. R=VD P /fb. 



For meaning of letters see previous table. 



Authorities: A, Allen, 1900; B 2 , Bacon and Reid ; E, Eiffel; P, Pannell; 

 R, Riabouchinski, 1914; S, Bureau of Standards; W, Wieselsberger. 1914, 

 1922. For more detailed references see I.C.T., 1, 411, 1926. 



TABLE 163. — Forces on Miscellaneous Bodies 



The values of the shape coefficients in the following table are to be used 

 with the area of the projection of the body on a plane normal to the wind 

 direction. Where this projection is a circle, the diameter is used as the quantity 

 L in the Reynolds Number. Where the projection is rectangular, the shortest 

 side of the rectangle is taken as L. 



Smithsonian Tables 



