# List of drag coefficient for basic shapes has no angles

• I
When I type "drag coefficient" in Google, and view some of the images, the standard list of geometrical shapes come into view, such as this one:

If we take the cone for example, there is a drag coefficient of 0.50. But I can't see the degrees, or the angle of the sides. Is not that very relevant?

Is there a "standard cone" with certain ratios?

Chestermiller
Mentor
When I type "drag coefficient" in Google, and view some of the images, the standard list of geometrical shapes come into view, such as this one:

If we take the cone for example, there is a drag coefficient of 0.50. But I can't see the degrees, or the angle of the sides. Is not that very relevant?

Is there a "standard cone" with certain ratios?

I looked at the Collins dictionary, and it states that "a cone is a shape with a circular base and smooth curved sides ending in a point at the top."

I can't seem to find a definitive ratio, this would be far more obvious for a cube as it's edges are clearly at 90 degrees.

Chestermiller
Mentor
The value is just an approximation. Certainly, the drag coefficient will also be a function of the Reynolds number and of the cone angle. But, to get a rough estimate, using 0.5 is probably going to give a decent approximation over a typical range of Reynolds numbers and cone angles. My advice is to keep looking for additional information and references if you need a more accurate estimate.

B92X