[kach22i]

Originally Posted by 3-Wheeler

You might find this interesting.

Especially Figures 12 and 13.

http://ecomodder.com/forum/showthrea...pes-11183.html

Jim.

Thanks for the link Jim.

Figure 11 is also interesting. A Cd of .27 for the truncated aerofoil, puts that shape in the same ballpark as the NASA sphere.

Shape Effects on Drag


Cd of .07 to .5 with the sphere, so a lot depends on the length of the aerofoil (Gurneyless goldfish FRONTAL AREA) to do a comparable. Why does the sphere have a "range" at all if the frontal areas are all the same in the NASA diagram?

http://ecomodder.com/forum/showthrea...pes-11183.html