Recent content by cocoon95

Knowing that the CD for an open cup is 1.42 and the closed side 0.38, is the CD for a 1/2 cup the same as a whole cup or does the CD change due to the different shape. If it changes would it be expected to change by a very small amount say < 0.05 or something larger like 0.10.

okay, The drag coefficeint is clear. If however I slice half of the cup off with a vertical cut and blank the end, so I really have a 1/4 sphere with a flat plate at the end of the cup, does the differential Cd remain the same for a relative wind perpendicular to the 1/4 cup vs the 1/4 sphere...

thanks for the link. It got me started in the right direction.

If differential drag on a four cup anemometer causes its rotation, how does one calculate the differential drag on a specific size cup and with a specific wind velocity assuming the wind is constant and in the same horizontal plane as the four cups.?